Tunable Crystallization Kinetics and Crystal Polymorphism in Semicrystalline Polymers: Insight into the Multilevel Structural Order of Polymer Melts,The Journal of Physical Chemistry Letters

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Tunable Crystallization Kinetics and Crystal Polymorphism in Semicrystalline Polymers: Insight into the Multilevel Structural Order of Polymer Melts
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2023-05-30 , DOI: 10.1021/acs.jpclett.3c01102
Lingling Ni ₁ , Shanshan Xu ₁ , Chenxuan Sun ₁ , Bao Wang _{1,

2} , Ying Zheng _{1,

2} , Chengtao Yu _{1,

2} , Yongzhong Bao _{1,

2} , Guorong Shan _{1,

2} , Pengju Pan _{1,

2}

Affiliation

The melting of semicrystalline polymers is a typical multistep process and involves a series of intermediate melt states. However, the structural characteristics of the intermediate polymer melt is unclear. Herein, we choose polymorphic trans-1,4-polyisoprene (tPI) as a model polymer system and elucidate the structures of the intermediate polymer melt and their strong effects on the following crystallization process. We find that the metastable β crystals of the tPI melt first into an intermediate state and then recrystallize in new crystals upon thermal annealing. The intermediate melt shows multilevel structural order at the chain level depending on the melting temperature. The conformationally ordered melt can memorize the initial crystal polymorph and accelerate the crystallization process, while the ordered melt without the conformational order can only enhance the crystallization rate. This work provides deep insight into the multilevel structural order of polymer melts and its strong memory effects on the crystallization process.

中文翻译：

半结晶聚合物中的可调结晶动力学和晶体多晶现象：洞察聚合物熔体的多级结构顺序

半结晶聚合物的熔化是一个典型的多步过程，涉及一系列中间熔体状态。然而，中间聚合物熔体的结构特征尚不清楚。在此，我们选择多晶型反式-1,4-聚异戊二烯 ( t PI) 作为模型聚合物体系，并阐明中间聚合物熔体的结构及其对后续结晶过程的强烈影响。我们发现t的亚稳态 β 晶体PI 首先熔化成中间状态，然后在热退火时重结晶为新晶体。中间熔体根据熔化温度在链水平显示多级结构顺序。构象有序的熔体可以记忆初始晶型并加速结晶过程，而没有构象有序的有序熔体只能提高结晶速率。这项工作对聚合物熔体的多级结构顺序及其对结晶过程的强记忆效应提供了深入的了解。

更新日期：2023-05-30

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