Advances in Elastomers and Rubber ElasticityJoginder Lal, James E. Mark The present book is a sequel to "Elastomers and Rubber Elasticity," edited by J.E. Mark and J. Lal and published by the American Chemical Society in 1982. It is also based on papers presented at an ACS Symposium, sponsored by the Division of Polymer Chemistry, Inc., in this case one held in Chicago in September of 1985. The keynote speaker was to have been Pro fessor Paul J. Flory, and his untimely death just prior to the symposium was a tremendous loss to all of polymer science, in particular to those in terested in elastomeric materials. It is to his memory that this book is dedicated. There has been a great deal of progress in preparing and studying elas tomers since the preceding symposium, which was in 1981. In the case of the synthesis and curing of elastomers, much of the background necessary to an appreciation of these advances is given in the first, introductory chapter. |
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Page 91
... CHDI have been compared to those obtained from several other diisocyanates in a study by Wong and Frisch . In general , the stress properties of the CHDI samples were poorer at room temperature but better retention of strength occurred ...
... CHDI have been compared to those obtained from several other diisocyanates in a study by Wong and Frisch . In general , the stress properties of the CHDI samples were poorer at room temperature but better retention of strength occurred ...
Page 96
... CHDI also produced softer samples . An alternative might be to prepare the polyurethanes by a one step technique rather than by the prepolymer method . This would probably lead to softer samples with more poorly organized hard segment ...
... CHDI also produced softer samples . An alternative might be to prepare the polyurethanes by a one step technique rather than by the prepolymer method . This would probably lead to softer samples with more poorly organized hard segment ...
Page 100
... CHDI also failed . All three had NCO / OH equivalent ratios of 0.85 , the lowest tested . Failure modes were of two types , cracking in the center of the block near the thermocouple or blow out at the edges of the blocks . All other ...
... CHDI also failed . All three had NCO / OH equivalent ratios of 0.85 , the lowest tested . Failure modes were of two types , cracking in the center of the block near the thermocouple or blow out at the edges of the blocks . All other ...
Contents
Introduction to Synthesis of Elastomers | 1 |
Structure and Properties of Tire Rubbers Prepared | 17 |
Polymer and Chain End Structure in Anionic Diene | 37 |
Copyright | |
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affine anionic antioxidant behavior block polymers butadiene calculated catalyst CHâ‚‚ chain end CHDI Chem chemical crosslinking crystalline crystallites crystallization curing curves cyclohexane deformation density diene dynamic mechanical effect elasticity elongation end block entanglements equation equilibrium experimental fatigue fraction function glass transition temperature groups hard segment content hard segment length higher hydrogenated hydrosilylation increase initiator intramolecular reaction isoprene Macromolecules measurements melting temperature microstructure modulus molecular weight molecules monodisperse monomer observed obtained oligomers orientation P. J. Flory PDMS peak phantom network phase Phys polybutadiene polyether polyisoprene polymerization polystyrene polyurethane-ureas polyurethanes prepared prepolymer PTMO rubber sample scattering segment length distribution shown in Figure soft segment solvent spectra strain stress stress-strain structure styrene swollen synthesis Table theory thermal thermoplastic thermoplastic elastomers tion toluene triblock copolymer uniaxial values vinyl content vulcanizates