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Temperature dependence of local segmental motion in polystyrene and its variation with molecular weight

机译:聚苯乙烯中局部链节运动的温度依赖性及其随分子量的变化

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摘要

Dielectric measurements are reported for the alpha-relaxation in polystyrene (PS) of varying molecular weights. Although the segmental relaxation dispersion was essentially invariant to M_W, the T_g-normalized temperature dependence (fragility) increases systematically with molecular weight. The latter result corroborates dynamic mechanical and light scattering studies, but is at odds with the reported (T-T_g) superppositioning of the shift factors for the recoverable creep compliance of PS. The failure of the dielectric relaxations time to superimpose when expressed as a function of T - T_g is consistent with the analysis of equation of state data for PS. We find that volume is not the dominant control variable, and in fact, temperature exerts a stronger influence on the relaxation times.
机译:据报道,在不同分子量的聚苯乙烯(PS)中,α-松弛的介电测量结果。尽管分段弛豫色散对于M_W基本不变,但是T_g归一化温度依赖性(脆弱性)随着分子量的增加而系统地增加。后者的结果证实了动态的机械和光散射研究,但与PS的可恢复蠕变顺应性的位移因子的报道(T-T_g)叠加不一致。当表示为T-T_g的函数时,介电弛豫时间的叠加失败与PS状态数据方程的分析一致。我们发现,体积不是主要的控制变量,实际上,温度对弛豫时间影响更大。

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