Kimata Shuichi, Sakurai Takashi, Nozue Yoshinobu, Kasahara Tatsuya, Yamaguchi Noboru, Karino Takeshi, Shibayama Mitsuhiro, Kornfield Julia A
Petrochemicals Research Laboratory, Sumitomo Chemical, 2-1 Kitasode, Sodegaura, Chiba 299-0295, Japan.
Science. 2007 May 18;316(5827):1014-7. doi: 10.1126/science.1140132.
In the rich and long-standing literature on the flow-induced formation of oriented precursors to polymer crystallization, it is often asserted that the longest, most extended chains are the dominant molecular species in the "shish" of the "shish-kebab" formation. We performed a critical examination of this widely held view, using deuterium labeling to distinguish different chain lengths within an overall distribution. Small-angle neutron-scattering patterns of the differently labeled materials showed that long chains are not overrepresented in the shish relative to their concentration in the material as a whole. We observed that the longest chains play a catalytic role, recruiting other chains adjacent to them into formation of the shish.
在关于流动诱导聚合物结晶取向前驱体形成的丰富且长期的文献中，人们常常断言，在“串珠”结构的“晶须”中，最长、伸展程度最大的链是主要的分子种类。我们使用氘标记来区分整体分布内不同的链长，对这一广泛持有的观点进行了批判性研究。不同标记材料的小角中子散射图谱表明，相对于它们在整个材料中的浓度，长链在晶须中并未过度占比。我们观察到，最长的链起到催化作用，将其相邻的其他链吸引到晶须的形成过程中。
