VISCOELASTIC PROPERTIES OF AMORPHOUS POLYMERS .2. ANOMALOUS TEMPERATURE-DEPENDENCE OF THE STEADY-STATE RECOVERABLE COMPLIANCE IN LOW-MOLECULAR-WEIGHT POLYMERS

被引:55
作者
NGAI, KL [1 ]
PLAZEK, DJ [1 ]
BERO, CA [1 ]
机构
[1] UNIV PITTSBURGH,DEPT MAT SCI & ENGN,PITTSBURGH,PA 15261
关键词
D O I
10.1021/ma00057a029
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Previous study of the viscoelastic behavior of low molecular weight polystyrenes found that the steady-state recoverable compliance, J(e)o, decreased markedly with temperature as the glass temperature, T(g), was approached from above. This anomalous viscoelastic property of polystyrene was explained by a model of coupled molecular motions. Application of the coupling model to low molecular weight poly isobutylene (PIB) leads to the prediction that the anomalous marked decrease of J(e)o will not be observed in PIB. This prediction made for the behavior of polyisobutylene was verified by new creep recovery measurements on a specimen of low molecular weight. The physical reasons for the observation of a breakdown of the Rouse model (modified for undiluted polymers) for low molecular weight polystyrene and the absence of it in polyisobutylene are given. The explanation, based on the coupling model, is illucidated by detailed comparisons between the viscoelastic properties of polystyrene and polyisobutylene.
引用
收藏
页码:1065 / 1071
页数:7
相关论文
共 22 条
[1]   CREEP, CREEP RECOVERY AND DYNAMIC MECHANICAL MEASUREMENTS OF A POLY(PROPYLENE GLYCOL) OLIGOMER [J].
COCHRANE, J ;
HARRISON, G ;
LAMB, J ;
PHILLIPS, DW .
POLYMER, 1980, 21 (07) :837-844
[2]  
Ferry JD., 1980, VISCOELASTIC PROPERT
[3]   VISCOELASTIC PROPERTIES OF POLYISOBUTYLENE MELTS [J].
FETTERS, LJ ;
GRAESSLEY, WW ;
KISS, AD .
MACROMOLECULES, 1991, 24 (11) :3136-3141
[4]  
FLOUDAS G, 1990, MACROMOLECULES, V23, P1104
[5]   DYNAMIC VISCOELASTIC BEHAVIOR OF LOW-MOLECULAR-MASS POLYSTYRENE MELTS [J].
GRAY, RW ;
HARRISON, G ;
LAMB, J .
PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, 1977, 356 (1684) :77-102
[6]   TEMPERATURE-DEPENDENCE OF EQUILIBRIUM AND INSTANTANEOUS COMPLIANCES OF LOW-MOLECULAR WEIGHT POLYSTYRENE MELTS [J].
GRAY, RW ;
HARRISON, G ;
LAMB, J .
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS, 1976, 14 (08) :1361-1365
[7]   AN EXPLANATION OF ANOMALOUS DIELECTRIC-RELAXATION PROPERTIES OF POLY(PROPYLENE GLYCOL) [J].
NGAI, KL ;
SCHONHALS, A ;
SCHLOSSER, E .
MACROMOLECULES, 1992, 25 (19) :4915-4919
[8]   A QUANTITATIVE EXPLANATION OF THE DIFFERENCE IN THE TEMPERATURE DEPENDENCES OF THE VISCOELASTIC SOFTENING AND TERMINAL DISPERSIONS OF LINEAR AMORPHOUS POLYMERS [J].
NGAI, KL ;
PLAZEK, DJ .
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS, 1986, 24 (03) :619-632
[9]   RELATION OF INTERNAL ROTATIONAL-ISOMERISM BARRIERS TO THE FLOW ACTIVATION-ENERGY OF ENTANGLED POLYMER MELTS IN THE HIGH-TEMPERATURE ARRHENIUS REGION [J].
NGAI, KL ;
PLAZEK, DJ .
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS, 1985, 23 (10) :2159-2180
[10]   INTERPRETATION OF DIFFERENCES IN TEMPERATURE AND PRESSURE DEPENDENCES OF DENSITY AND CONCENTRATION FLUCTUATIONS IN AMORPHOUS POLY(PHENYLMETHYL SILOXANE) [J].
NGAI, KL ;
FYTAS, G .
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS, 1986, 24 (08) :1683-1694