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Venkataramanarao Rao - One of the best experts on this subject based on the ideXlab platform.
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an efficient reverse diels alder approach for the synthesis of n alkyl Bismaleimides
ChemInform, 2013Co-Authors: James R Mcelhanon, Venkataramanarao Rao, Suryakiran Navath, Mohankumar Kottur, Dominic V. McgrathAbstract:A simple strategy is developed to synthesize Bismaleimides (IV) via alkylation of the Diels—Alder product (I) followed by a Retro-Diels-Alder reaction.
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an efficient reverse diels alder approach for the synthesis of n alkyl Bismaleimides
Tetrahedron Letters, 2013Co-Authors: James R Mcelhanon, Venkataramanarao Rao, Suryakiran Navath, Mohankumar Kottur, Dominic V. McgrathAbstract:Abstract Bismaleimides are useful precursors for Diels–Alder reactions, Michael additions, and thiol–maleimide based conjugation for the synthesis of materials and polymers. Use of Bismaleimide cross linkers for generating polymers, bioconjugate molecules, and useful imaging molecules is an active area of research. An efficient and practical synthetic protocol for N-alkyl bis-maleimide cross linkers starting from furan protected maleimide employing a reverse Diels–Alder reaction is reported.
Dominic V. Mcgrath - One of the best experts on this subject based on the ideXlab platform.
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an efficient reverse diels alder approach for the synthesis of n alkyl Bismaleimides
ChemInform, 2013Co-Authors: James R Mcelhanon, Venkataramanarao Rao, Suryakiran Navath, Mohankumar Kottur, Dominic V. McgrathAbstract:A simple strategy is developed to synthesize Bismaleimides (IV) via alkylation of the Diels—Alder product (I) followed by a Retro-Diels-Alder reaction.
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an efficient reverse diels alder approach for the synthesis of n alkyl Bismaleimides
Tetrahedron Letters, 2013Co-Authors: James R Mcelhanon, Venkataramanarao Rao, Suryakiran Navath, Mohankumar Kottur, Dominic V. McgrathAbstract:Abstract Bismaleimides are useful precursors for Diels–Alder reactions, Michael additions, and thiol–maleimide based conjugation for the synthesis of materials and polymers. Use of Bismaleimide cross linkers for generating polymers, bioconjugate molecules, and useful imaging molecules is an active area of research. An efficient and practical synthetic protocol for N-alkyl bis-maleimide cross linkers starting from furan protected maleimide employing a reverse Diels–Alder reaction is reported.
M Alagar - One of the best experts on this subject based on the ideXlab platform.
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studies on thermal mechanical and morphological behaviour of caprolactam blocked methylenediphenyl diisocyanate toughened Bismaleimide modified epoxy matrices
European Polymer Journal, 2008Co-Authors: S Premkumar, Karikal C Chozhan, M AlagarAbstract:Abstract Diglycidyl ether of bisphenol A epoxy resin (DGEBA, LY 556) was toughened with 5%, 10% and 15% (by wt) of caprolactam blocked methylenediphenyl diisocyanate (CMDI) using 4,4′-diaminodiphenylmethane (DDM) as curing agent. The toughened epoxy resin was further modified with chemical modifier N,N′-bismaleimido-4,4′-diphenylmethane (BMI). Caprolactam blocked methylenediphenyl diisocyanate was synthesized by the reaction of caprolactam with methylenediphenyl diisocyanate in presence of carbon tetrachloride under nitrogen atmosphere. Thermal properties of the developed matrices were characterized by means of differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), heat distortion temperature (HDT) and dynamic mechanical analysis (DMA). Mechanical properties like tensile strength, flexural strength and impact strength were tested as per ASTM standards. The glass transition temperature (Tg) and thermal stability were decreased with increase in the percentage incorporation of CMDI. The thermomechanical properties of caprolactam blocked methylenediphenyl diisocyanate toughened epoxy resin were increased by increasing the percentage incorporation of Bismaleimide. The values of impact strength for epoxy resin were increased with increase in the percentage concentration of CMDI. The homogeneous morphology of CMDI toughened epoxy resin and Bismaleimide modified CMDI toughened epoxy resin system were ascertained from scanning electron microscope (SEM).
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Bismaleimides 1 3 bismaleimidobenzene and 1 1 bis 4 maleimidophenyl cyclohexane modified polyethersulfone epoxy matrices for engineering applications
Journal of Composite Materials, 2008Co-Authors: R Rajasekaran, M AlagarAbstract:Bismaleimides (BMI) modified polyethersulfone (PES)-epoxy interpenetrating networks were developed. Epoxy systems modified with 4%, 8%, and 12% (by wt) of polyethersulfone were made by using epoxy ...
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mechanical properties of Bismaleimides modified polysulfone epoxy matrices
International Journal of Polymeric Materials, 2007Co-Authors: R Rajasekaran, M AlagarAbstract:Epoxy resin has been chemically modified using 4, 8, and 12% of bisphenol-A based polysulphone along with three types of Bismaleimides, namely [N, N′-bismaleimido-4,4′-diphenylmethane (BMI-1), 1,3-bis (maleimido) benzene (BMI-2) and 1,1′-bis (4-maleimidophenyl) cyclohexane (BMI-3)]. The epoxy hybrid matrices developed, in the form of castings, were used to characterize their mechanical properties like tensile strength, tensile modulus, flexural strength, flexural modulus, impact strength, hardness, and dynamic mechanical analysis as per ASTM standards. Data obtained from mechanical studies indicate that the introduction of hydroxyl terminated polysulfone into epoxy resin enhanced the value of impact strength to the extent of 48% due to the formation of flexible graft structures. Similarly, the incorporation of Bismaleimides into epoxy resin also improved both tensile and flexural behavior of epoxy resin. Further, the introduction of combination of both polysulfone and Bismaleimides into epoxy resin improv...
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a comparative study on the preparation and characterization of aromatic and aliphatic Bismaleimides modified polyurethane epoxy interpenetrating polymer network matrices
Journal of Applied Polymer Science, 2006Co-Authors: K P O Mahesh, M Alagar, S JothibasuAbstract:Interpenetrating polymer networks of Bismaleimide-modified polyurethane–epoxy systems were prepared using the aliphatic and aromatic Bismaleimides- and polyurethane-modified epoxy and cured in the presence of 4,4′-diaminodiphenylmethane. Infrared spectral analysis was used to confirm the polyurethane-crosslinked epoxy (PU–EP). The matrices developed were characterized by mechanical, thermal, electrical, and morphological studies. The results obtained from the mechanical studies indicate that the incorporation of polyurethane and Bismaleimides into epoxy increased the tensile strength, flexural strength, and impact strength, according to their nature and percentage concentration. The results obtained from the thermal and electrical studies indicate that the incorporation of polyurethane into epoxy decreased the thermal properties (glass transition temperature, heat distortion temperature (HDT), thermal stability) and electrical properties (dielectric strength, volume and surface resistivity, and arc resistance). The incorporation of aromatic Bismaleimide into the polyurethane-modified epoxy system increased the glass transition temperature, thermal stability, and electrical properties. Decreased values of glass transition and HDT were obtained in the case of aliphatic Bismaleimide-modified polyurethane–epoxy system. Surface morphology of modified epoxy systems was studied using scanning electron microscopy, and it was found that the polyurethane-modified epoxy systems exhibited heterogeneous morphology and Bismaleimides-modified epoxy systems showed a homogeneous morphology. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 99: 3592–3602, 2006
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Bismaleimides n n Bismaleimide 4 4 diphenylmethane and n n Bismaleimideo 4 4 diphenylsulphone modified bisphenoldicyanate epoxy matrices for engineering applications
Materials and Manufacturing Processes, 2005Co-Authors: K Dinakaran, Suresh R Kumar, M AlagarAbstract:ABSTRACT An interpenetrating network of cyanate ester (CE)-Bismaleimide (BMI)-epoxy matrix systems was developed. Epoxy systems modified with 4%, 8%, and 12% (by wt) of cyanate ester were made by using epoxy resin and cyanate ester with diaminodiphenylmethane as curing agent. The cyanate-ester-toughened epoxy systems were further modified with 4%, 8%, and 12% (by wt) of Bismaleimides, namely N, N′-bismaleimido-4, 4′-diphenylmethane and N, N′-bismaleimido-4, 4′-diphenylsulphone. BMI-CE-Epoxy matrices were characterized using differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and heat deflection temperature (HDT) analysis. The DSC thermograms of cyanate-ester-modified epoxy and BMI-modified epoxy during cure show unimodal reaction exotherms. The studies indicate that thermal stability and resistance to water absorption of epoxy resin has been enhanced by the introduction of cyanate ester. The incorporation of Bismaleimide into unmodified epoxy and CE epoxy enhanced the thermal and me...
Mohankumar Kottur - One of the best experts on this subject based on the ideXlab platform.
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an efficient reverse diels alder approach for the synthesis of n alkyl Bismaleimides
ChemInform, 2013Co-Authors: James R Mcelhanon, Venkataramanarao Rao, Suryakiran Navath, Mohankumar Kottur, Dominic V. McgrathAbstract:A simple strategy is developed to synthesize Bismaleimides (IV) via alkylation of the Diels—Alder product (I) followed by a Retro-Diels-Alder reaction.
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an efficient reverse diels alder approach for the synthesis of n alkyl Bismaleimides
Tetrahedron Letters, 2013Co-Authors: James R Mcelhanon, Venkataramanarao Rao, Suryakiran Navath, Mohankumar Kottur, Dominic V. McgrathAbstract:Abstract Bismaleimides are useful precursors for Diels–Alder reactions, Michael additions, and thiol–maleimide based conjugation for the synthesis of materials and polymers. Use of Bismaleimide cross linkers for generating polymers, bioconjugate molecules, and useful imaging molecules is an active area of research. An efficient and practical synthetic protocol for N-alkyl bis-maleimide cross linkers starting from furan protected maleimide employing a reverse Diels–Alder reaction is reported.
James R Mcelhanon - One of the best experts on this subject based on the ideXlab platform.
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an efficient reverse diels alder approach for the synthesis of n alkyl Bismaleimides
ChemInform, 2013Co-Authors: James R Mcelhanon, Venkataramanarao Rao, Suryakiran Navath, Mohankumar Kottur, Dominic V. McgrathAbstract:A simple strategy is developed to synthesize Bismaleimides (IV) via alkylation of the Diels—Alder product (I) followed by a Retro-Diels-Alder reaction.
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an efficient reverse diels alder approach for the synthesis of n alkyl Bismaleimides
Tetrahedron Letters, 2013Co-Authors: James R Mcelhanon, Venkataramanarao Rao, Suryakiran Navath, Mohankumar Kottur, Dominic V. McgrathAbstract:Abstract Bismaleimides are useful precursors for Diels–Alder reactions, Michael additions, and thiol–maleimide based conjugation for the synthesis of materials and polymers. Use of Bismaleimide cross linkers for generating polymers, bioconjugate molecules, and useful imaging molecules is an active area of research. An efficient and practical synthetic protocol for N-alkyl bis-maleimide cross linkers starting from furan protected maleimide employing a reverse Diels–Alder reaction is reported.