当前位置: X-MOL 学术Mater. Today Chem. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
The outlined polymorph selection of iPB-1 revealing by incorporation of a dentritic polymer
Materials Today Chemistry ( IF 7.3 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.mtchem.2020.100307
Q. Wu , J. Li , S. Jiang

Abstract By incorporating a hydrophilic dentritic polyester into polymorphic isotactic polybutene-1 (iPB-1), we successfully decreased its viscosity as designed to trigger the melt crystallisation of form III due to the proposed decrease of the interactions between the iPB-1 chain sequences. In addition to the usual form II formation, the form III formation resulting from cooling the iPB-1 melt at suitable cooling rates has been verified by the DSC, WAXD, and in-situ synchrotron WAXS measurements. It was proposed that the form III melt crystallisation occurs after the 4/1 helix conformation formation in the iPB-1 melt and the following alignment of the resulting 4/1 helices. Once the interactions between the iPB-1 chain sequences are sufficiently strong as in the usual iPB-1 melt, the collapse of the 4/1 into the 11/3 helix conformation would occur and finally trigger the generally observed melt crystallisation of form II. Thus, we first outlined the polymorph selection process of iPB-1 based on the helix conformation formation and the following alignment of the helices which finally result in crystallisation of iPB-1 into corresponding crystal forms. The results are helpful for understanding of both the polymorph selection of polymorphic polymers like iPB-1 and the general polymer crystallisation.

中文翻译:

iPB-1 的概述多晶型选择通过掺入树突聚合物揭示

摘要 通过将亲水性树枝状聚酯掺入多晶型全同立构聚丁烯-1 (iPB-1) 中,我们成功地降低了其粘度,因为 iPB-1 链序列之间的相互作用会减少,从而触发形式 III 的熔体结晶。除了通常的 II 型形成之外,通过 DSC、WAXD 和原位同步加速器 WAXS 测量验证了以合适的冷却速率冷却 iPB-1 熔体导致的 III 型形成。有人提出,在 iPB-1 熔体中形成 4/1 螺旋构象和随后的所得 4/1 螺旋排列之后,III 型熔体结晶发生。一旦 iPB-1 链序列之间的相互作用足够强,就像通常的 iPB-1 熔体一样,将发生 4/1 折叠成 11/3 螺旋构象并最终触发通常观察到的形式 II 的熔体结晶。因此,我们首先概述了基于螺旋构象形成和随后的螺旋排列的 iPB-1 多晶型选择过程,最终导致 iPB-1 结晶成相应的晶体形式。结果有助于理解多晶型聚合物如 iPB-1 的多晶型选择和一般聚合物结晶。
更新日期:2020-09-01
down
wechat
bug