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arXiv 1304.3571cond-mat.soft
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polymer结晶过程中链折叠的动力学机理

Kinetic mechanism of chain folding in polymer crystallization

S. Stepanow

摘要:

我开发了一个动力学机制来解释在聚合物结晶链折叠的基础上形成的茎,这是由于频繁的职业的反式沿链在过冷的聚合物熔体,和无规线圈结构的聚合物链之间的竞争。将长度为$% d_l$的茎的平均形成时间与相同弧长$d_l$的聚合物片的Rouse时间设置为相等,得到茎和束的厚度的下限。估算的片层厚度与过冷度成反比。本方法强调了排斥相互作用在聚合物结晶中的重要性,预计这是负责对数片层增厚和片层厚度随压力的增加。通过将生长看作一个动态的多阶段过程,导出了生长速率的表达式。

英文摘要:

I develop a kinetic mechanism to explain chain folding in polymer crystallization which is based on the competition between the formation of stems, which is due to frequent occupations of trans states along the chains in the supercooled polymer melt, and the random coil structure of the polymer chains. Setting equal the average formation time of stems of length $% d_l$ with the Rouse time of a piece of polymer of the same arc length $d_l$ yields a lower bound for the thickness of stems and bundles. The estimated lamellar thickness is inversely proportional to the supercooling. The present approach emphasizes the importance of repulsive interactions in polymer crystallization, which are expected to be responsible for the logarithmic lamellar thickening and the increase of lamellar thickness with pressure. An expression for the growth rate is derived by considering the growth as a dynamic multistage process.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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