Conformation Directed Mpemba Effect on Polylactide Crystallization

Hu Cunliang; Li Jingqing; Huang Shaoyong; Li Hongfei; Luo Chuanfu; Chen Jizhong; Jiang Shichun; An Lijia

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Conformation Directed Mpemba Effect on Polylactide Crystallization

机译：构象指示MPEMBA对聚丙环结晶的影响

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Structures of polymers depend on the degree of polymerization and chain conformation, and the chain conformation plays a key role on the structure formation and structure transition of an existing polymer, especially for the crystalline polymers. DSC and WAXD measurements were performed to investigate crystallization behavior and structure of polylactide (PLA) with different thermal histories. A similar Mpemba effect was found during the crystallization process, which showed that the PLA sample quenched from "hot" crystallizes faster than that quenched from the "cold". The obtained crystallization half-times of isothermal crystallization, and the crystallization temperatures, glass transition temperatures, and melting points during the cold nonisothermal crystallization process with a high heating rate, decrease with holding temperature. The Mpempa effect was discussed and attributed to the temperature dependent chain conformation or local structure of the amorphous and confined effect on the conformation adjustment before PLA crystallization. The unusual crystallization phenomenon of PLA would be helpful to understand the polymer crystallization and control the crystalline structure of PLA.

机译：聚合物的结构取决于聚合度和链构象，链构象对现有聚合物的结构形成和结构转变起关键作用，特别是对于结晶聚合物。进行DSC和WAXD测量以研究具有不同热历史的聚乳糖（PLA）的结晶行为和结构。在结晶过程中发现了类似的MPEMBA效应，这表明PLA样品从“冷”中淬灭，比从“冷”淬火的速度更快。获得的结晶半次次数的等温结晶，以及在冷非热结晶过程中的结晶温度，玻璃化转变温度和熔点，加热速率高，随着保持温度降低。讨论了MPEMPA效应，并归因于无定形的链构象或局部结构的无定形和局限性对PLA结晶前的构象调节的局部结构。 PLA的不寻常的结晶现象是有助于了解聚合物结晶并控制PLA的晶体结构。

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《Crystal growth & design》 |2018年第10期|共6页
作者
Hu Cunliang; Li Jingqing; Huang Shaoyong; Li Hongfei; Luo Chuanfu; Chen Jizhong; Jiang Shichun; An Lijia;
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作者单位

Tianjin Univ Sch Mat Sci &

Engn Tianjin 300072 Peoples R China;

Tianjin Univ Sch Mat Sci &

Engn Tianjin 300072 Peoples R China;

Chinese Acad Sci Changchun Inst Appl Chem State Key Lab Polymer Phys &

Chem Changchun 130022 Jilin Peoples R China;

Chinese Acad Sci Changchun Inst Appl Chem State Key Lab Polymer Phys &

Chem Changchun 130022 Jilin Peoples R China;

Chinese Acad Sci Changchun Inst Appl Chem State Key Lab Polymer Phys &

Chem Changchun 130022 Jilin Peoples R China;

Chinese Acad Sci Changchun Inst Appl Chem State Key Lab Polymer Phys &

Chem Changchun 130022 Jilin Peoples R China;

Tianjin Univ Sch Mat Sci &

Engn Tianjin 300072 Peoples R China;

Chinese Acad Sci Changchun Inst Appl Chem State Key Lab Polymer Phys &

Chem Changchun 130022 Jilin Peoples R China;

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正文语种 eng
中图分类晶体学;
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1. Conformation Directed Mpemba Effect on Polylactide Crystallization [J] . Hu Cunliang, Li Jingqing, Huang Shaoyong, Crystal growth & design . 2018,第10期

机译：构象指示MPEMBA对聚丙环结晶的影响
2. The effect of heat treatment on water sorption in polylactide and polylactide composites via changes in glass-transition temperature and crystallization kinetics [J] . Du A., Koo D., Ziegler M., Journal of Polymer Science, Part B. Polymer Physics . 2011,第12期

机译：热处理对玻璃化转变温度和结晶动力学变化的影响对聚丙交酯和聚丙交酯复合材料中水的吸附的影响
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机译：通过添加五臂星形聚丙交酯接枝的多壁碳纳米管制备的聚丙交酯复合材料的形貌，流变和结晶行为
4. Preparation of Chitin Whisker and Effect to Crystallization of Polylactide [C] . Nichaphat Passornraprasit, Wanpen Tachaboonyakiat International Conference on Applied Engineering, Materials and Mechanics . 2018

机译：用丁蛋白晶须的制备及其对聚丙环结晶的影响
5. Applicaton of atomic force microscopy for the study of crystallization kinetics and morphology of L- and D-polylactide blends in solution cast thin films. [D] . Yuryev, Yury. 2006

机译：原子力显微镜在溶液浇铸薄膜中L和D-聚丙交酯共混物的结晶动力学和形态研究中的应用。
6. Effect of Organic Modifier and Clay Content on Non-Isothermal Cold Crystallization and Melting Behavior of Polylactide/Organovermiculite Nanocomposites [O] . M. Jesús Fernández, M. Dolores Fernández 2020

机译：有机改性剂和粘土含量对聚乳酸/有机蒙脱土纳米复合材料非等温冷结晶和熔融行为的影响
7. Conformation Directed Mpemba Effect on Polylactide Crystallization [O] . -1

机译：构象导向MPEMBA对聚乳糖结晶的影响

Conformation Directed Mpemba Effect on Polylactide Crystallization

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