Physical Properties of Polymers |
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Page 39
... fact that steric hindrance to free rotation of the bonds on the valence- angle cone is of less consequence at high than at low tempera- tures . It may be assumed that the larger thermal energy resident in the chain at high temperatures ...
... fact that steric hindrance to free rotation of the bonds on the valence- angle cone is of less consequence at high than at low tempera- tures . It may be assumed that the larger thermal energy resident in the chain at high temperatures ...
Page 40
... fact that for a given elongation each chain segment will be less highly oriented if N is larger . Although Eq . ( 2.7 ) is a good approximation for small elongations of the molecule , it is about 7 per cent in error when r / Na has ...
... fact that for a given elongation each chain segment will be less highly oriented if N is larger . Although Eq . ( 2.7 ) is a good approximation for small elongations of the molecule , it is about 7 per cent in error when r / Na has ...
Page 262
... fact that at high test rates the chains were unable to elongate fast enough under the combined action of the viscous and applied forces . Since each chain was still quite coiled even at the instant the sample broke , there were several ...
... fact that at high test rates the chains were unable to elongate fast enough under the combined action of the viscous and applied forces . Since each chain was still quite coiled even at the instant the sample broke , there were several ...
Contents
Chain Dimensions | 13 |
Rubber Elasticity | 37 |
Diffusion and Viscosity | 61 |
Copyright | |
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applied force approximation assumed average behavior bond break center of mass chain ends Chapter compliance computation considered constant copolymer crosslinking crystal crystallites d(ln dashpot decrease dielectric dielectric constant dipole discussed effect elastic elongation energy loss entanglements equation equilibrium experiment experimental fact free volume freely orienting chain freely orienting segments function given by Eq glass temperature Hence jump frequency large number linear liquid load low-molecular-weight material Maxwell element measurements melting point method modes of motion modulus molecular weight molecule monomer natural rubber network chains obtained plot polyisobutylene polymer chain polymer molecule polymerization polymethyl methacrylate polystyrene polyvinyl chloride predicted problem quantity ratio reason region relation response result retardation rotation sample shear rate shown in Figure stress relaxation stretched superposition superposition principle tear tensile strength term thermal tion variation vibration viscosity viscous forces Voigt elements zero