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首页> 外文期刊>The Journal of Chemical Physics >Viscoelastic effects on early stage of spinodal decomposition in dynamically asymmetric polymer blends
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Viscoelastic effects on early stage of spinodal decomposition in dynamically asymmetric polymer blends

机译：动态不对称聚合物共混物中旋节线分解早期的粘弹性效应

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摘要

Spinodal decomposition induced by a rapid pressure change was investigated for a dynamically asymmetric polymer blend [deuterated polybutadiene (DPB)/polyisoprene (PI)] with a composition of 50/50 wt/wt by using time-resolved small angle neutron scattering. The time change in the scattered intensity distribution with wave number (q) during the spinodal decomposition was found to be approximated by the Doi-Onuki theory [M. Doi and A. Onuki, J. Phys. II 2, 1631 (1992)]. The theoretical analysis yielded the q dependence of the Onsager kinetic coefficient which is characterized by the q(-2) dependence at q xi(ve)>1 with the characteristic length xi(ve) being much larger than the radius of gyration of DPB or PI. The estimated xi(ve) agrees well with that obtained previously in the relaxation processes induced by pressure change within the one phase region for the same blend.
机译：通过使用时间分辨小角度中子散射，研究了由50/50 wt / wt组成的动态不对称聚合物共混物[氘化聚丁二烯（DPB）/聚异戊二烯（PI）]由快速压力变化引起的旋节线分解。发现在旋节线分解过程中，散射强度分布随波数（q）的时间变化可以通过Doi-Onuki理论[M. Doi和A. Onuki，J。Phys。 II 2，1631（1992）]。理论分析得出Onsager动力学系数的q依赖性，其特征在于在q xi（ve）> 1时具有q（-2）依赖性，特征长度xi（ve）远大于DPB或Db的回转半径。 PI。估计的xi（ve）与先前在相同混合物的单相区域内压力变化引起的弛豫过程中获得的结果十分吻合。

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