The Experts below are selected from a list of 255 Experts worldwide ranked by ideXlab platform
A.g. Supri - One of the best experts on this subject based on the ideXlab platform.
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chicken feather fibers recycled high density polyethylene composites the effect of e Caprolactam
Journal of Thermoplastic Composite Materials, 2015Co-Authors: A.g. Supri, Mim Yazid, Emy A Aizat, M MasturinaAbstract:The effects of e-Caprolactam on tensile properties, morphology, thermal degradation, and swelling behavior of recycled high-density polyethylene–chicken feather fiber composites (r-HDPE/CFF) were studied. The r-HDPE/CFF composites were prepared using Brabender Plasticorder at 160°C and a rotor speed of 50 r min−1 for 6 min. The r-HDPE/CFF/e-Caprolactam composites exhibit higher tensile strength, modulus of elasticity, and final decomposition temperature, but lower mass swell percentage and elongation at break than r-HDPE/CFF composites. Scanning electron microscopic morphology showed that the CFF was more widely dispersed in the r-HDPE matrix with the addition of e-Caprolactam as a coupling agent. It was also found that the addition of e-Caprolactam offers better thermal stability in r-HDPE/CFF/Caprolactam composites than r-HDPE/CFF composites.
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Tensile Properties, Swelling Behavior, and Morphology Analysis of Recycled High Density Polyethylene / Natural Rubber / Chicken Feather Fibers (R-HDPE / NR / CFF) Composites: The Effects of Caprolactam
Advanced Materials Research, 2013Co-Authors: A.g. Supri, Mohammed IzzuddeenAbstract:The effect of Caprolactam as a coupling agent on the tensile properties, swelling behavior and morphology analysis of recycled high density polyethylene/ natural rubber/ chicken feather fiber (R-HDPE/ NR/ CFF) composites was studied. The R-HDPE/NR/CFF composites with and without Caprolactam were prepared using Brabender Plasticorder at 160°C and rotor speed of 50 rpm. The results indicated that R-HDPE/NR/CFF with Caprolactam showed higher value of tensile strength but lower elongation at break and mass swell percentage than R-HDPE/NR/CFF composites. SEM morphology showed that the addition of Caprolactam improved the fiber matrix-interfacial adhesion and good dispersion of the fiber in the R-HDPE/NR blends.
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tensile properties swelling behavior and morphology analysis of recycled high density polyethylene natural rubber chicken feather fibers r hdpe nr cff composites the effects of Caprolactam
Advanced Materials Research, 2013Co-Authors: A.g. Supri, Mohammed IzzuddeenAbstract:The effect of Caprolactam as a coupling agent on the tensile properties, swelling behavior and morphology analysis of recycled high density polyethylene/ natural rubber/ chicken feather fiber (R-HDPE/ NR/ CFF) composites was studied. The R-HDPE/NR/CFF composites with and without Caprolactam were prepared using Brabender Plasticorder at 160°C and rotor speed of 50 rpm. The results indicated that R-HDPE/NR/CFF with Caprolactam showed higher value of tensile strength but lower elongation at break and mass swell percentage than R-HDPE/NR/CFF composites. SEM morphology showed that the addition of Caprolactam improved the fiber matrix-interfacial adhesion and good dispersion of the fiber in the R-HDPE/NR blends.
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Chicken feather fibers–recycled high-density polyethylene composites: The effect of ε-Caprolactam
Journal of Thermoplastic Composite Materials, 2013Co-Authors: A.g. Supri, A Emy Aizat, Mim Yazid, M MasturinaAbstract:The effects of e-Caprolactam on tensile properties, morphology, thermal degradation, and swelling behavior of recycled high-density polyethylene–chicken feather fiber composites (r-HDPE/CFF) were studied. The r-HDPE/CFF composites were prepared using Brabender Plasticorder at 160°C and a rotor speed of 50 r min−1 for 6 min. The r-HDPE/CFF/e-Caprolactam composites exhibit higher tensile strength, modulus of elasticity, and final decomposition temperature, but lower mass swell percentage and elongation at break than r-HDPE/CFF composites. Scanning electron microscopic morphology showed that the CFF was more widely dispersed in the r-HDPE matrix with the addition of e-Caprolactam as a coupling agent. It was also found that the addition of e-Caprolactam offers better thermal stability in r-HDPE/CFF/Caprolactam composites than r-HDPE/CFF composites.
Mohammed Izzuddeen - One of the best experts on this subject based on the ideXlab platform.
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Tensile Properties, Swelling Behavior, and Morphology Analysis of Recycled High Density Polyethylene / Natural Rubber / Chicken Feather Fibers (R-HDPE / NR / CFF) Composites: The Effects of Caprolactam
Advanced Materials Research, 2013Co-Authors: A.g. Supri, Mohammed IzzuddeenAbstract:The effect of Caprolactam as a coupling agent on the tensile properties, swelling behavior and morphology analysis of recycled high density polyethylene/ natural rubber/ chicken feather fiber (R-HDPE/ NR/ CFF) composites was studied. The R-HDPE/NR/CFF composites with and without Caprolactam were prepared using Brabender Plasticorder at 160°C and rotor speed of 50 rpm. The results indicated that R-HDPE/NR/CFF with Caprolactam showed higher value of tensile strength but lower elongation at break and mass swell percentage than R-HDPE/NR/CFF composites. SEM morphology showed that the addition of Caprolactam improved the fiber matrix-interfacial adhesion and good dispersion of the fiber in the R-HDPE/NR blends.
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tensile properties swelling behavior and morphology analysis of recycled high density polyethylene natural rubber chicken feather fibers r hdpe nr cff composites the effects of Caprolactam
Advanced Materials Research, 2013Co-Authors: A.g. Supri, Mohammed IzzuddeenAbstract:The effect of Caprolactam as a coupling agent on the tensile properties, swelling behavior and morphology analysis of recycled high density polyethylene/ natural rubber/ chicken feather fiber (R-HDPE/ NR/ CFF) composites was studied. The R-HDPE/NR/CFF composites with and without Caprolactam were prepared using Brabender Plasticorder at 160°C and rotor speed of 50 rpm. The results indicated that R-HDPE/NR/CFF with Caprolactam showed higher value of tensile strength but lower elongation at break and mass swell percentage than R-HDPE/NR/CFF composites. SEM morphology showed that the addition of Caprolactam improved the fiber matrix-interfacial adhesion and good dispersion of the fiber in the R-HDPE/NR blends.
Tobias Gruber - One of the best experts on this subject based on the ideXlab platform.
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from supramolecular methyllysine receptors to bridged Caprolactams
2019Co-Authors: Tobias GruberAbstract:One of the major mechanisms of epigenetic control is methylation and demethylation of lysine residues in histone proteins. The desire to understand the function of these modifications promoted the development of artificial molecules that recognize and bind methyllysine. One focus of this presentation is on synthetic macrocycles and their ability to recognize differently methylated lysines. Recent developments and our own efforts in this area will be discussed. (Hanauer et al., Org. Biomol. Chem. 2017, 15, 1100; Gruber, ChemBioChem 2018, DOI: 10.1002/cbic.201800398.) In the second part of the lecture the latest research on new synthetic routes for bridged Caprolactams is presented. We recently established a facile synthetic pathway towards the 7,8-dioxo-6-azabicyclo[3.2.1]octane scaffold using readily available Caprolactam esters. The latter are cyclized after adequate N-protection using strong, non-nucleophilic bases. Mechanistic details of this particular type of Dieckmann cyclization as well as side products and artefacts occurring during the reaction will be presented. (C. Weck et al., New J. Chem. 2017, 41, 9984.)
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synthesis of a bicyclic oxo γ lactam from a simple Caprolactam derivative
New Journal of Chemistry, 2017Co-Authors: Tobias Gruber, Christopher J. Schofield, Christian Weck, Franziska Obst, Elisa NauhaAbstract:The synthesis of the 6-azabicyclo[3.2.1]octane ring system, via Dieckmann cyclization, is described. Ring closure involves reaction of a Caprolactam enolate with a C-6 ester, the reactive axial conformation of which is promoted by the presence of an N-tert-butyloxycarbonyl group on the lactam nitrogen. The results will enable the synthesis of new bridged Caprolactams for testing as antibacterials and nucleophilic enzyme inhibitors.
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conformational studies on substituted e Caprolactams by x ray crystallography and nmr spectroscopy
New Journal of Chemistry, 2014Co-Authors: Tobias Gruber, Barbara Odell, Amber L. Thompson, Petra Bombicz, Christopher J. SchofieldAbstract:The synthesis and conformational analysis of e-Caprolactams containing a –COOMe group at the C-6 position is described. The influence of different C-2, C-6 and N substituents on ring conformation was studied using X-ray crystallography and NMR spectroscopy. The results provide evidence that all the analysed Caprolactams adopt a chair type conformation with a planar lactam. In the 6-substituted Caprolactam, the –COOMe residue prefers to reside in an equatorial position, but can be induced to occupy an axial orientation by the introduction of a bulky tert-butyloxycarbonyl (BOC) group on the lactam nitrogen or by C-2/C-3 ring desaturation. The BOC protected Caprolactam was found to undergo exchange between two chair forms as detected by solution NMR, one with the C-6 ester equatorial (30%) and the other with it in the axial position (70%); the latter was observed by X-ray crystallography. For the C-2 dithiocarbamate substituted C-6 methyl ester seven-membered rings, a single chair form is observed for cis-isomers with both substituents equatorial. The analogous trans-isomers, however, exist as two chair forms in a 1 : 1 equilibrium ratio of 1,NC4 and 4C1,N conformers, where either substituent can occupy axial or equatorial positions.
M Masturina - One of the best experts on this subject based on the ideXlab platform.
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chicken feather fibers recycled high density polyethylene composites the effect of e Caprolactam
Journal of Thermoplastic Composite Materials, 2015Co-Authors: A.g. Supri, Mim Yazid, Emy A Aizat, M MasturinaAbstract:The effects of e-Caprolactam on tensile properties, morphology, thermal degradation, and swelling behavior of recycled high-density polyethylene–chicken feather fiber composites (r-HDPE/CFF) were studied. The r-HDPE/CFF composites were prepared using Brabender Plasticorder at 160°C and a rotor speed of 50 r min−1 for 6 min. The r-HDPE/CFF/e-Caprolactam composites exhibit higher tensile strength, modulus of elasticity, and final decomposition temperature, but lower mass swell percentage and elongation at break than r-HDPE/CFF composites. Scanning electron microscopic morphology showed that the CFF was more widely dispersed in the r-HDPE matrix with the addition of e-Caprolactam as a coupling agent. It was also found that the addition of e-Caprolactam offers better thermal stability in r-HDPE/CFF/Caprolactam composites than r-HDPE/CFF composites.
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Chicken feather fibers–recycled high-density polyethylene composites: The effect of ε-Caprolactam
Journal of Thermoplastic Composite Materials, 2013Co-Authors: A.g. Supri, A Emy Aizat, Mim Yazid, M MasturinaAbstract:The effects of e-Caprolactam on tensile properties, morphology, thermal degradation, and swelling behavior of recycled high-density polyethylene–chicken feather fiber composites (r-HDPE/CFF) were studied. The r-HDPE/CFF composites were prepared using Brabender Plasticorder at 160°C and a rotor speed of 50 r min−1 for 6 min. The r-HDPE/CFF/e-Caprolactam composites exhibit higher tensile strength, modulus of elasticity, and final decomposition temperature, but lower mass swell percentage and elongation at break than r-HDPE/CFF composites. Scanning electron microscopic morphology showed that the CFF was more widely dispersed in the r-HDPE matrix with the addition of e-Caprolactam as a coupling agent. It was also found that the addition of e-Caprolactam offers better thermal stability in r-HDPE/CFF/Caprolactam composites than r-HDPE/CFF composites.
Christopher J. Schofield - One of the best experts on this subject based on the ideXlab platform.
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synthesis of a bicyclic oxo γ lactam from a simple Caprolactam derivative
New Journal of Chemistry, 2017Co-Authors: Tobias Gruber, Christopher J. Schofield, Christian Weck, Franziska Obst, Elisa NauhaAbstract:The synthesis of the 6-azabicyclo[3.2.1]octane ring system, via Dieckmann cyclization, is described. Ring closure involves reaction of a Caprolactam enolate with a C-6 ester, the reactive axial conformation of which is promoted by the presence of an N-tert-butyloxycarbonyl group on the lactam nitrogen. The results will enable the synthesis of new bridged Caprolactams for testing as antibacterials and nucleophilic enzyme inhibitors.
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conformational studies on substituted e Caprolactams by x ray crystallography and nmr spectroscopy
New Journal of Chemistry, 2014Co-Authors: Tobias Gruber, Barbara Odell, Amber L. Thompson, Petra Bombicz, Christopher J. SchofieldAbstract:The synthesis and conformational analysis of e-Caprolactams containing a –COOMe group at the C-6 position is described. The influence of different C-2, C-6 and N substituents on ring conformation was studied using X-ray crystallography and NMR spectroscopy. The results provide evidence that all the analysed Caprolactams adopt a chair type conformation with a planar lactam. In the 6-substituted Caprolactam, the –COOMe residue prefers to reside in an equatorial position, but can be induced to occupy an axial orientation by the introduction of a bulky tert-butyloxycarbonyl (BOC) group on the lactam nitrogen or by C-2/C-3 ring desaturation. The BOC protected Caprolactam was found to undergo exchange between two chair forms as detected by solution NMR, one with the C-6 ester equatorial (30%) and the other with it in the axial position (70%); the latter was observed by X-ray crystallography. For the C-2 dithiocarbamate substituted C-6 methyl ester seven-membered rings, a single chair form is observed for cis-isomers with both substituents equatorial. The analogous trans-isomers, however, exist as two chair forms in a 1 : 1 equilibrium ratio of 1,NC4 and 4C1,N conformers, where either substituent can occupy axial or equatorial positions.
