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首页> 外文期刊>Polymer: The International Journal for the Science and Technology of Polymers >Elongational flow-induced morphology change of block copolymers - Part 1. A polystyrene-block-poly(ethylene butylene)-block-polystyrene-block-poly(ethylene butylene) tetrablock copolymer with polystyrene spherical microdomains
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Elongational flow-induced morphology change of block copolymers - Part 1. A polystyrene-block-poly(ethylene butylene)-block-polystyrene-block-poly(ethylene butylene) tetrablock copolymer with polystyrene spherical microdomains

机译：嵌段共聚物的伸长流致形态学变化-第1部分。具有聚苯乙烯球形微区的聚苯乙烯-嵌段-聚（乙烯丁烯）-嵌段-聚苯乙烯-嵌段-聚（乙烯丁烯）四嵌段共聚物

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Simultaneous measurements of transient tensile stress and birefringence are conducted as a function of Hencky strain rate epsilon (0) and elongation time t on a polystyrene-block-poly(ethylene butylene)-block-polystyrene-block-poly(ethylene butylene) tetrablock copolymer with a weight fraction of polystyrene (PS) of 0.205, which displays spherical morphology. The measurements are carried out at high temperatures between the glass transition temperature of PS and the order-disorder transition temperature (T-ODT similar to 190 degreesC) of the block copolymer under uniaxial elongation with epsilon (0) between 0.01 and 1.0 s(-1). The data exhibit strain-induced softening under high epsilon (0) (similar to1.0 s(-1)) at low temperatures, but strain-induced hardening under low epsilon (0) (similar to0.01 s(-1)) at high temperatures. The stress-optical coefficient C(epsilon (0); t) is almost constant under high epsilon (0) at low temperatures, close to the value of low-density polyethylene melt (similar to2.2 x 10(-9) Pa-1), whereas it increases by approximately 10-50 times under low epsilon (0) at high temperature. The plots of the C(epsilon (0); t) vs, t/a(T) (a(T) being the WLF shift factor) are roughly fitted into a single curve, indicating that the C(epsilon (0); t) depends on t/a(T), rather than Hencky strain epsilon. Such behavior, especially under low epsilon (0), reflects the contribution of form birefringence Deltan(f) of the deformed PS domains. Small angle X-ray scattering and transmission electron microscopy observation reveal that under high epsilon (0), the spherical PS-domains are not appreciably changed, whereas under low epsilon (0), they are deformed into cylinders and oriented along the direction of elongation, thereby resulting in the large contribution of Deltan(f). (C) 2000 Elsevier Science Ltd. All rights reserved. [References: 42]
机译：瞬态拉伸应力和双折射的同时测量是亨克基应变率ε（0）和伸长时间t的函数，对聚苯乙烯-嵌段-聚（乙烯-丁烯）-嵌段-聚苯乙烯-嵌段-聚（乙烯-丁烯）四嵌段共聚物聚苯乙烯（PS）的重量分数为0.205，呈球形。该测量是在PS的玻璃化转变温度和嵌段共聚物的有序-无序转变温度（T-ODT类似于190摄氏度）之间的高温下进行的，单轴伸长率为0.01至1.0 s（-）之间的ε（0） 1）。数据显示出在低温下高ε（0）（约1.0 s（-1））下的应变诱导软化，但在低ε（0）（约0.01 s（-1））下的应变引起的硬化。在高温下。应力光学系数C（ε（0）; t）在高ε（0）下在低温下几乎恒定，接近低密度聚乙烯熔体的值（类似于2.2 x 10（-9）Pa- 1），而在高温下低ε（0）下它会增加约10至50倍。将C（ε（0）; t）与t / a（T）（a（T）为WLF移位因子）的曲线粗略拟合为一条曲线，表明C（ε（0）; t）取决于t / a（T），而不是Hencky应变epsilon。这种行为，特别是在低ε（0）下，反映了变形PS域的形式双折射Deltan（f）的贡献。小角X射线散射和透射电镜观察表明，在高ε（0）下，球形PS结构域没有明显变化，而在低ε（0）下，它们变形为圆柱体并沿伸长方向取向，从而导致Deltan（f）的巨大贡献。 （C）2000 Elsevier ScienceLtd。保留所有权利。 [参考：42]

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