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Jan Feijen - One of the best experts on this subject based on the ideXlab platform.
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Biocompatibility and degradation of aliphatic segmented poly(Ester Amide)s:In vitro andin vivo evaluation
Journal of Biomedical Materials Research Part A, 2006Co-Authors: Priscilla A. M. Lips, Marja J. A. Van Luyn, Federica Chiellini, Linda A. Brouwer, Ingrid W. Velthoen, Piet J. Dijkstra, Jan FeijenAbstract:Aliphatic segmented poly(Ester Amide)s, comprising a crystallizable Amide phase and a flexible amorphous Ester phase, were investigated for potential use in biomedical applications. By varying the Amide content and the type of crystallizable Amide segments, the polymer's thermal and mechanical properties can readily be tuned. Polymers with 25 and 50 mol % of Amide content are noncytotoxic and sustain growth of fibroblasts onto polymer films. The in vitro degradation of these polymers was followed in PBS (pH 7.4) at 37 degrees C Lip to 7 months. The poly(Ester Amide)s showed the characteristics of bulk degradation with a gradual decrease in molecular weight and almost no mass loss. The in vivo degradation of these polymers, followed by subcutaneous implantation in rats up to 6 weeks, was slow and similar to the in vitro degradation. The tissue response upon implantation was followed over 6 weeks. A mild foreign-body reaction, characterized by the presence of macrophages, and sporadically a lymphocyte, were observed in the first week of implantation. After 6 weeks the implant site is characterized by fibrous encapsulation with no signs of inflammation. The poly(Ester Amide)s tested are biocompatible, but their in vitro as well as in vivo degradation is very slow. (c) 2005 Wiley Periodicals, Inc
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biocompatibility and degradation of aliphatic segmented poly Ester Amide s in vitro and in vivo evaluation
Journal of Biomedical Materials Research Part A, 2006Co-Authors: P.a.m. Lips, I.w. Velthoen, Marja J. A. Van Luyn, Federica Chiellini, Linda A. Brouwer, Piet J. Dijkstra, Jan FeijenAbstract:Aliphatic segmented poly(Ester Amide)s, comprising a crystallizable Amide phase and a flexible amorphous Ester phase, were investigated for potential use in biomedical applications. By varying the Amide content and the type of crystallizable Amide segments, the polymer's thermal and mechanical properties can readily be tuned. Polymers with 25 and 50 mol % of Amide content are noncytotoxic and sustain growth of fibroblasts onto polymer films. The in vitro degradation of these polymers was followed in PBS (pH 7.4) at 37°C up to 7 months. The poly(Ester Amide)s showed the characteristics of bulk degradation with a gradual decrease in molecular weight and almost no mass loss. The in vivo degradation of these polymers, followed by subcutaneous implantation in rats up to 6 weeks, was slow and similar to the in vitro degradation. The tissue response upon implantation was followed over 6 weeks. A mild foreign-body reaction, characterized by the presence of macrophages, and sporadically a lymphocyte, were observed in the first week of implantation. After 6 weeks the implant site is characterized by fibrous encapsulation with no signs of inflammation. The poly(Ester Amide)s tested are biocompatible, but their in vitro as well as in vivo degradation is very slow.
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Synthesis and characterization of poly(Ester Amide)s containing crystallizable Amide segments
Polymer, 2005Co-Authors: P.a.m. Lips, René Broos, M.j.m. Van Heeringen, Pieter J. Dijkstra, Jan FeijenAbstract:High molecular weight segmented poly(Ester Amide)s were prepared by melt polycondensation of 1,4-butanediol, dimethyl adipate and a preformed bisAmide-diol based on 1,4-diaminobutane and e-caprolactone. By varying the ratio of the bisAmide-diol and 1,4-butanediol, a series of polymers was obtained with a hard segment content between 10 and 85 mol%. FT-IR and WAXD analysis revealed that the poly(Ester Amide)s crystallize in an α-type phase similar to the α-phase of even–even nylons. These polymers all have a micro-phase separated structure with an Amide-rich hard phase and an Ester-rich flexible soft phase. The polymers have a low and a high melt transition, corresponding with the melting of crystals comprising single Ester Amide sequences and two or more Ester Amide sequences, respectively. The low melt transition is between 58 and 70 °C and is independent of polymer composition. By increasing the hard segment content from 10 to 85 mol% the high melt transition increased from 83 to 140 °C while the glass transition temperature increased from −45 to −5 °C. Likewise, the elastic modulus increased from 70 to 524 MPa, the stress at break increased from 8 to 28 MPa while the strain at break decreased from 820 to 370%. Thermal and mechanical properties can thus be tuned for specific applications by varying the hard segment content in these segmented polymers.
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Incorporation of different crystallizable Amide blocks in segmented poly(Ester Amide)s
Polymer, 2005Co-Authors: P.a.m. Lips, René Broos, M.j.m. Van Heeringen, Pieter J. Dijkstra, Jan FeijenAbstract:High molecular weight segmented poly(Ester Amide)s were prepared by melt polycondensation of dimethyl adipate, 1,4-butanediol and a symmetrical bisAmide-diol based on e-caprolactone and 1,2-diaminoethane or 1,4-diaminobutane. FT-IR and WAXD analysis revealed that segmented poly(Ester Amide)s based on the 1,4-diaminobutane (PEA(4)) give an α-type crystalline phase whereas polymers based on the 1,2-diaminoethane (PEA(2)) give a mixture of α- and γ-type crystalline phases with the latter being similar to γ-crystals present in odd–even nylons. PEA(2) and PEA(4) polymers with a hard segment content of 25 or 50 mol% have a micro-phase separated structure with an Amide-rich hard phase and an Ester-rich flexible soft phase. All polymers have a glass transition temperature below room temperature and melt transitions are present at 62–70 °C (Tm,1) and at 75–130 °C (Tm,2) with the latter being highest at higher hard segment content. The two melt transitions are ascribed to melting of crystals comprising single Ester Amide sequences and two or more Ester Amide sequences, respectively. These polymers have an elastic modulus in the range of 159–359 MPa, a stress at break in the range of 15–25 MPa combined with a high strain at break (590–810%). The thermal and mechanical properties are not influenced by the different crystalline structures of the polymers, only by the amount of crystallizable hard segment present.
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Gas foaming of segmented poly(Ester Amide) films
Polymer, 2005Co-Authors: P.a.m. Lips, Pieter J. Dijkstra, I.w. Velthoen, Matthias Wessling, Jan FeijenAbstract:Biodegradable segmented poly(Ester Amide)s, based on dimethyl adipate, 1,4-butanediol and N,N?-1,2-ethanediyl-bis[6-hydroxy-hexanAmide], with two distinct melting transitions were gas foamed using carbon dioxide (CO2). Polymer films were saturated with CO2 at 50 bar for 6 h after which the pressure was released. The samples were immersed in octane at the desired temperature after which foaming started immediately. Just above the lower melt transition the polymers retain adequate mechanical properties and dimensional stability, while the chain mobility increased sufficiently to nucleate and expand gas cells during the foaming process. In this way semi-crystalline poly(Ester Amide)s can be gas foamed below the flow temperature. Two poly(Ester Amide)s with 25 mol% (PEA2,5-25) and 50 mol% (PEA2,5-50) of bisAmide segment content were foamed at 70 and 105 °C, respectively. The storage modulus (G?) of both pure polymers at the onset foaming temperature is 50?60 MPa. Closed-cell foams were obtained with a maximum porosity of not, vert, similar90%. The average pore size of PEA2,5-25 ranges from 77 to 99 ?m. In contrast, the average pore size of PEA2,5-50 is in between 2 and 4 ?m and can be increased to 100 ?m by lowering the CO2 saturation pressure to 20 bar. The porosity of PEA2,5-50 foams using this saturation pressure decreased to 70%
Niranjan Karak - One of the best experts on this subject based on the ideXlab platform.
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Waterborne hyperbranched poly(Ester Amide urethane) thermoset: Mechanical, thermal and biodegradation behaviors
Polymer Degradation and Stability, 2017Co-Authors: Gaurav Gogoi, Niranjan KarakAbstract:Abstract Renewable resource based waterborne hyperbranched poly(Ester Amide urethane)s (WHPEAU) with varying compositions were synthesized by reacting polyAmide polyol of diethanol amine, caprolactam and citric acid with dimer acid, phthalic anhydride and isophorone diisocyanate via a catalyst and solvent free facile route. The parent poly(Ester Amide) was obtained by using the same technique and reactants except isophorone isocyanate. The chemical structures of the prepared polymers were characterized by NMR and FTIR spectral analyses. The thermosets of these polymers were obtained by chemical crosslinking with commercially available epoxy and fatty acid modified poly(amido amine) hardener. These thermosets showed high mechanical properties like tensile strength (7.5 MPa against 3 MPa) and toughness (14.48 MJm −3 against 6 MJm −3 ) without much losing the elongation at break (174% against 286%) over the poly(Ester Amide) thermoset. Further, chemical resistance of the thermosets in different chemical media was found to be better than the poly(Ester Amide) thermoset. Most interestingly, the accelerated bacterial biodegradability using bacterial strain like Pseudomonas Auregonisa ( P. Auregonisa ) revealed almost comparable biodegradability to the poly(Ester Amide) thermoset. The WHPEAU thermosets, thus, not only exhibited high performance but they also possess required attributes to be used as environmentally benign polymeric material.
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Vegetable oil-based poly(Ester Amide)s
Vegetable Oil-Based Polymers, 2012Co-Authors: Niranjan KarakAbstract:This chapter describes vegetable oil-based poly(Ester Amide)s. It deals with the importance, materials and methods, modification, characterisation, curing, structure–property relationships and applications of vegetable oil-based poly(Ester Amide)s. The chapter also includes a short review of such poly(Ester Amide)s from various vegetable oils. These poly(Ester Amide)s have additional advantages over analogous polyEsters and can be used in different fields of applications such as paint, coating, adhesives and as binders for composites. Metal-containing poly(Ester Amide) thermoset resists rusting and corrosion and has potential for use in biomedicinal, antibacterial and active antifungal materials.
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Synthesis, characterization and properties of a castor oil modified biodegradable poly(Ester Amide) resin
Progress in Organic Coatings, 2012Co-Authors: Sujata Pramanik, Kalpana Sagar, Bolin Kumar Konwar, Niranjan KarakAbstract:A biodegradable poly(Ester Amide) resin was synthesized from N,N-bis(2-hydroxy ethyl) fatty Amide of castor oil with maleic anhydride, phthalic anhydride and isophthalic acid (100:30:35:35 mole ratio) by the polycondensation process. The fatty Amide of the oil was obtained for the first time with 95% yield. The chemical structure of the synthesized resin was characterized by spectroscopic techniques like FTIR, 1H NMR and 13C NMR. Various physical properties such as acid value, saponification value, iodine value, specific gravity and viscosity of the resin were also determined. Further the rheological behavior, studied in the steady shear mode showed shear thinning behavior of the resin. The epoxy cured poly(Ester Amide) thermoset using poly(amido amine) hardener exhibited better properties than with the cycloaliphatic amine hardener cured system. TGA studies also revealed higher thermal stability of the former system than the latter. In vitro-biodegradation study of the poly(Ester Amide) thermoset using Pseudomonas aeruginosa and Bacillus subtilus bacteria revealed superior biodegradability of the thermoset using the former bacterial strain. Excellent chemical resistance against various chemical media including alkali was observed for epoxy-poly(amido amine) cured poly(Ester Amide) resin over epoxy-cycloaliphatic amine one. The epoxy-poly(amido amine) cured poly(Ester Amide) thermoset thus has the potential to be used as surface coating material.
Sebastián Muñoz-guerra - One of the best experts on this subject based on the ideXlab platform.
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Poly(Ester Amide)s Derived from l-Malic Acid
Macromolecules, 2004Co-Authors: Celia Regaño, A. Alla, A. Martínez De Ilarduya, Sebastián Muñoz-guerraAbstract:A series of aregic poly(Ester Amide)s (ar-PEALM) with Ester to Amide groups ratios (a:b) ranging from 1:50 up to 1:2 were prepared from O-methyl-l-malic acid, 1,6-hexanediol, and 1,6-hexanediamine. The Ester linkage was incorporated in the poly(Ester Amide) chain using 6-aminohexylpentachlorophenyl O-methyl-l-malate as comonomer in the polycondensation of bis(pentachlorophenyl) O-methyl-l-malate with 1,6-hexanediamine. The polycondensation of the amino Ester alone afforded isoregic ir-PEALM (1:1) with both the amino alcohol and the malic units oriented in a unique manner along the polymer chain. The composition of ar-PEALM was found to be close to that of the feed used for polycondensation, with the diamine units incorporated in slight excess. The molecular weights of PEALM roughly oscillated between 10 000 and 50 000. All the poly(Ester Amide)s were semicrystalline with Tm decreasing with the content in Ester groups from 168 to 144 °C and Tg falling down in parallel from 60 to 10 °C. The thermal decompos...
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Alternating Copoly(Ester Amide)s derived from Amino Alcohols and L-Tartaric and Succinic Acids
Macromolecular Chemistry and Physics, 2001Co-Authors: Isabel Villuendas, Alfonso Rodríguez-galán, J. J. Bou, Sebastián Muñoz-guerraAbstract:A set of copoly(Ester Amide)s (s-PEASTn) containing equal amounts of Amide and Ester groups has been synthesized from succinic and tartaric acids, and aliphatic linear amino alcohols with 2, 3 and 6 carbon atoms. In these mixed poly(Ester Amide)s the amino alcohol unit adopts a syndioregic orientation and the succinic and tartaric units alternate regularly along the polymer chain. These compounds were characterized by elemental analysis, SEC and FT-IR and 1 H/ 13 C NMR spectroscopy. s-PEASTn are stereoregular polymers which display optical activity in solution and are crystalline in the solid state with melting points between 90 and 160° C. They all are non-water soluble at room temperature but take up water in amounts up to 30% of their weights when exposed to a humid atmosphere.
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Hydrolytic and enzymatic degradation of copoly(Ester Amide)s based on l-tartaric and succinic acids
Polymer, 2000Co-Authors: A. Alla, Alfonso Rodríguez-galán, Sebastián Muñoz-guerraAbstract:Abstract The hydrolytic and enzymatic degradation of a series of crystalline copoly(Ester Amide)s derived from l -tartaric and succinic acids, 1,6 hexanediamine and 1,6-hexanediol with Ester/Amide groups ratios 3/97, 10/90, 15/85 and 20/80 was investigated. The hydrolytic degradation study was carried out at 37°C in buffered solution at pH 7.4. Changes taking place in sample weight, molecular weight, chemical constitution and thermal properties of the polymer were evaluated. Degradation proceeded with a notable increment in crystallinity and entailing slight but significant changes in the Tg and Tm temperatures. It was found that copoly(Ester Amide)s degraded faster than the parent poly(hexamethylene-di-O-methyl- l -tartarAmide) and that the rate of degradation increased with the content in Ester groups. It was also showed that degradation is accompanied by formation of cyclic succinimide units indicative of a scission mechanism based on the occurrence of intramolecular imidation reactions. The enzymatic degradation of these copoly(Ester Amide)s with papain was comparatively examined for a preliminary evaluation of their potential biodegradability.
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Degradable poly(Ester Amide)s based on l-tartaric acid
Polymer, 1997Co-Authors: A. Alla, Alfonso Rodríguez-galán, A. Martínez De Llarduya, Sebastián Muñoz-guerraAbstract:Abstract A series of poly(Ester Amide)s with Ester/Amide group ratios ranging from 1 99 to 1 4 were obtained using 1,6-hexanediamine, 1,6-hexanediol and 2,3-di-O-methoxy- l -tartaric and succinic acids as building blocks. The Ester linkages were introduced in pairs using as comonomer the diacid resulting from the Esterification of 1,6-hexanediol with 2 mol of succinic anhydride. Polycondensastion reactions were carried out in solution at room temperature with the diamine activated as the N,N′-bis(trimethylsilyl) derivative and the two diacids as bis(pentachlorophenyl) Esters. The prepared poly(Ester Amide)s have number average molecular weights in the range 10 000–40 000, display optical activity and are soluble in chloroform. These copolymers were found to be highly crystalline with melting points above 200°C and mechanical moduli comparable to those reported for the parent polyAmide poly(hexamethylene-di-O-methyl- l -tartarAmide). They were degraded by aqueous buffer of pH 7.4 at a rate that increased with the content of the copolymer in succinic acid units. 1H n.m.r. evidenced that no reactions other than those entailing the hydrolysis of the main chain Ester bonds appear to take place at polymer degradation.
P.a.m. Lips - One of the best experts on this subject based on the ideXlab platform.
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biocompatibility and degradation of aliphatic segmented poly Ester Amide s in vitro and in vivo evaluation
Journal of Biomedical Materials Research Part A, 2006Co-Authors: P.a.m. Lips, I.w. Velthoen, Marja J. A. Van Luyn, Federica Chiellini, Linda A. Brouwer, Piet J. Dijkstra, Jan FeijenAbstract:Aliphatic segmented poly(Ester Amide)s, comprising a crystallizable Amide phase and a flexible amorphous Ester phase, were investigated for potential use in biomedical applications. By varying the Amide content and the type of crystallizable Amide segments, the polymer's thermal and mechanical properties can readily be tuned. Polymers with 25 and 50 mol % of Amide content are noncytotoxic and sustain growth of fibroblasts onto polymer films. The in vitro degradation of these polymers was followed in PBS (pH 7.4) at 37°C up to 7 months. The poly(Ester Amide)s showed the characteristics of bulk degradation with a gradual decrease in molecular weight and almost no mass loss. The in vivo degradation of these polymers, followed by subcutaneous implantation in rats up to 6 weeks, was slow and similar to the in vitro degradation. The tissue response upon implantation was followed over 6 weeks. A mild foreign-body reaction, characterized by the presence of macrophages, and sporadically a lymphocyte, were observed in the first week of implantation. After 6 weeks the implant site is characterized by fibrous encapsulation with no signs of inflammation. The poly(Ester Amide)s tested are biocompatible, but their in vitro as well as in vivo degradation is very slow.
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Synthesis and characterization of poly(Ester Amide)s containing crystallizable Amide segments
Polymer, 2005Co-Authors: P.a.m. Lips, René Broos, M.j.m. Van Heeringen, Pieter J. Dijkstra, Jan FeijenAbstract:High molecular weight segmented poly(Ester Amide)s were prepared by melt polycondensation of 1,4-butanediol, dimethyl adipate and a preformed bisAmide-diol based on 1,4-diaminobutane and e-caprolactone. By varying the ratio of the bisAmide-diol and 1,4-butanediol, a series of polymers was obtained with a hard segment content between 10 and 85 mol%. FT-IR and WAXD analysis revealed that the poly(Ester Amide)s crystallize in an α-type phase similar to the α-phase of even–even nylons. These polymers all have a micro-phase separated structure with an Amide-rich hard phase and an Ester-rich flexible soft phase. The polymers have a low and a high melt transition, corresponding with the melting of crystals comprising single Ester Amide sequences and two or more Ester Amide sequences, respectively. The low melt transition is between 58 and 70 °C and is independent of polymer composition. By increasing the hard segment content from 10 to 85 mol% the high melt transition increased from 83 to 140 °C while the glass transition temperature increased from −45 to −5 °C. Likewise, the elastic modulus increased from 70 to 524 MPa, the stress at break increased from 8 to 28 MPa while the strain at break decreased from 820 to 370%. Thermal and mechanical properties can thus be tuned for specific applications by varying the hard segment content in these segmented polymers.
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Incorporation of different crystallizable Amide blocks in segmented poly(Ester Amide)s
Polymer, 2005Co-Authors: P.a.m. Lips, René Broos, M.j.m. Van Heeringen, Pieter J. Dijkstra, Jan FeijenAbstract:High molecular weight segmented poly(Ester Amide)s were prepared by melt polycondensation of dimethyl adipate, 1,4-butanediol and a symmetrical bisAmide-diol based on e-caprolactone and 1,2-diaminoethane or 1,4-diaminobutane. FT-IR and WAXD analysis revealed that segmented poly(Ester Amide)s based on the 1,4-diaminobutane (PEA(4)) give an α-type crystalline phase whereas polymers based on the 1,2-diaminoethane (PEA(2)) give a mixture of α- and γ-type crystalline phases with the latter being similar to γ-crystals present in odd–even nylons. PEA(2) and PEA(4) polymers with a hard segment content of 25 or 50 mol% have a micro-phase separated structure with an Amide-rich hard phase and an Ester-rich flexible soft phase. All polymers have a glass transition temperature below room temperature and melt transitions are present at 62–70 °C (Tm,1) and at 75–130 °C (Tm,2) with the latter being highest at higher hard segment content. The two melt transitions are ascribed to melting of crystals comprising single Ester Amide sequences and two or more Ester Amide sequences, respectively. These polymers have an elastic modulus in the range of 159–359 MPa, a stress at break in the range of 15–25 MPa combined with a high strain at break (590–810%). The thermal and mechanical properties are not influenced by the different crystalline structures of the polymers, only by the amount of crystallizable hard segment present.
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Gas foaming of segmented poly(Ester Amide) films
Polymer, 2005Co-Authors: P.a.m. Lips, Pieter J. Dijkstra, I.w. Velthoen, Matthias Wessling, Jan FeijenAbstract:Biodegradable segmented poly(Ester Amide)s, based on dimethyl adipate, 1,4-butanediol and N,N?-1,2-ethanediyl-bis[6-hydroxy-hexanAmide], with two distinct melting transitions were gas foamed using carbon dioxide (CO2). Polymer films were saturated with CO2 at 50 bar for 6 h after which the pressure was released. The samples were immersed in octane at the desired temperature after which foaming started immediately. Just above the lower melt transition the polymers retain adequate mechanical properties and dimensional stability, while the chain mobility increased sufficiently to nucleate and expand gas cells during the foaming process. In this way semi-crystalline poly(Ester Amide)s can be gas foamed below the flow temperature. Two poly(Ester Amide)s with 25 mol% (PEA2,5-25) and 50 mol% (PEA2,5-50) of bisAmide segment content were foamed at 70 and 105 °C, respectively. The storage modulus (G?) of both pure polymers at the onset foaming temperature is 50?60 MPa. Closed-cell foams were obtained with a maximum porosity of not, vert, similar90%. The average pore size of PEA2,5-25 ranges from 77 to 99 ?m. In contrast, the average pore size of PEA2,5-50 is in between 2 and 4 ?m and can be increased to 100 ?m by lowering the CO2 saturation pressure to 20 bar. The porosity of PEA2,5-50 foams using this saturation pressure decreased to 70%
Nikul N. Patel - One of the best experts on this subject based on the ideXlab platform.
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Studies on novel interpenetrating networks of urethane modified poly(Ester-Amide) and vinyl Ester of bisphenol-C
Journal of Saudi Chemical Society, 2016Co-Authors: Pragnesh N. Dave, Nikul N. PatelAbstract:Abstract Bisphthalamic acids were prepared by reaction of maleic anhydride and aromatic diamines. Novel poly(Ester-Amide)s (PEAs) were prepared by reaction of DGEBF with bisphthalamic acids. Acrylation of PEAs was carried out using acryloyl chloride; products are called acrylated poly(Ester-Amide)s (APEAs). Epoxy resin based unsaturated poly(Ester-Amide) resins (UPEAs) can be prepared by many methods but here these were prepared by reported method. These UPEAs were then treated with acryloyl chloride to afford acrylated UPEAs resin (i.e. AUPEAs). Interpenetrating networks of equal proportional urethane modified poly(Ester-Amide) and acrylated poly(Ester-Amide) and vinyl Ester of biaphenol c (VE) resin were prepared. Urethane modified APEAs and AUPEAs were characterized by elemental analysis, molecular weight was determined by vapor pressure osmometer and by IR spectral study and by thermogravimetry. Based on DSC data in situ glass reinforced composites of the resultant blends have been prepared and characterized for mechanical, electrical and chemical properties. Unreinforced blends were characterized by thermogravimetry (TGA).
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Synthesis, characterization of novel interacting blends of acrylated poly(Ester-Amide)s containing epoxy residues with vinyl Ester resin
Journal of Saudi Chemical Society, 2014Co-Authors: Pragnesh N. Dave, Nikul N. PatelAbstract:Abstract Unsaturated bisamic acids were prepared by reaction between maleic anhydride and different aromatic diamines. Unsaturated poly(Ester-Amide) resin (UPEAs) was prepared by reaction of diglycidylether of bisphenol-A (DGEBA) with unsaturated bisamic acids. Acrylation of Unsaturated poly(Ester-Amide)s (UPEAs) was carried out to afford acrylated UPEAs resin (i.e., AUPEAs). Interacting blends of Acrylated unsaturated poly(Ester-Amide)s (AUPEAs) with vinyl Ester epoxy (VE) resin were prepared. APEAs and AUPEAs were characterized by elemental analysis, molecular weight determined by vapor pressure osmometer and by IR spectral study and by thermogravimetry. The curing of interacting blends was monitored on differential scanning calorimeter (DSC). Based on DSC data in situ glass reinforced composites of the resultant blends have been prepared and characterized for mechanical, electrical and chemical properties. Unreinforced blends were characterized thermo-gravimetrically (TGA).
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Synthesis, properties, and applications of urethane-modified acrylated poly(Ester-Amide)s
Research on Chemical Intermediates, 2012Co-Authors: Pragnesh N. Dave, Nikul N. PatelAbstract:Epoxy resin-based unsaturated poly(Ester-Amide) resins (UPEAs) were treated with acryloyl chloride to afford acrylated UPEAs resins (AUPEAs). Urethane-based acrylated poly(Ester-Amide)s prepared by reaction with diisocyanate were characterized by elemental analysis, by molecular weight determination (by vapour pressure osmometry), by IR spectral study, and by thermogravimetry. The curing of interacting blends was monitored by differential scanning calorimetry (DSC). On the basis of DSC data in-situ glass-reinforced composites were prepared from the resulting materials and their mechanical, electrical, and chemical properties were characterized. Unreinforced blends were characterized by thermogravimetry.