Isothermal and nonisothermal crystallization kinetics of bio-sourced nylon 69

doi:10.1016/j.cjche.2015.12.021

Chinese Journal of Chemical Engineering ›› 2016, Vol. 24 ›› Issue (5): 638-645.DOI: 10.1016/j.cjche.2015.12.021

• 第25届中国过程控制会议专栏 • 上一篇下一篇

Isothermal and nonisothermal crystallization kinetics of bio-sourced nylon 69

Zhijuan Sun¹, XiaoWang¹, Fei Guo¹, Chunyue Jiang², Qinmin Pan³

1 The Zhejiang Province Key Laboratory of Biofuel, Ocean College, Zhejiang University of Technology, Hangzhou 310014, China;
2 The Zhejiang Province Key Laboratory of Biofuel, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China;
3 Department of Polymer Science and Engineering, Soochow University, Suzhou 215123, China

收稿日期:2015-06-30 修回日期:2015-08-14 出版日期:2016-05-28 发布日期:2016-06-14
通讯作者: Chunyue Jiang
基金资助:
Supported by the Natural Science Foundation of Zhejiang Province (LY15B060006), the National Natural Science Foundation of China (21104066) and the Zhejiang Province Public Technology Research and Industrial Grant (2012C21078).

Isothermal and nonisothermal crystallization kinetics of bio-sourced nylon 69

Zhijuan Sun¹, XiaoWang¹, Fei Guo¹, Chunyue Jiang², Qinmin Pan³

1 The Zhejiang Province Key Laboratory of Biofuel, Ocean College, Zhejiang University of Technology, Hangzhou 310014, China;
2 The Zhejiang Province Key Laboratory of Biofuel, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China;
3 Department of Polymer Science and Engineering, Soochow University, Suzhou 215123, China

Received:2015-06-30 Revised:2015-08-14 Online:2016-05-28 Published:2016-06-14
Contact: Chunyue Jiang
Supported by:
Supported by the Natural Science Foundation of Zhejiang Province (LY15B060006), the National Natural Science Foundation of China (21104066) and the Zhejiang Province Public Technology Research and Industrial Grant (2012C21078).

摘要/Abstract

摘要： Bio-sourced nylon 69, one of promising engineering plastics, has a great potential in developing sustainable technology and various commercial applications. Isothermal and nonisothermal crystallization kinetics of nylon 69 is a base to optimize the process conditions and establish the structure-property correlations for nylon 69, and it is also highly beneficial for successful applications of nylon products in industry. Isothermal and nonisothermal crystallization kinetics has been investigated by differential scanning calorimetry for nylon 69, bio-sourced even-odd nylon. The isothermal crystallization kinetics has been analyzed by the Avrami equation, the calculated Avrami exponent at various crystallization temperatures falls into the range of 2.28 and 2.86. In addition, the Avrami equation modified by Jeziorny and the equation suggested by Mo have been adopted to study the nonisothermal crystallization. The activation energies for isothermal and nonisothermal crystallization have also been determined. The study demonstrates that the crystallization model of nylon 69 might be a twodimensional (circular) growth at both isothermal and nonisothermal crystallization conditions. Furthermore, the value of the crystallization rate parameter (K) decreases significantly but the crystallization half-time (t_1/2) increases with the increase of the isothermal crystallization temperature. To nonisothermal crystallization, the crystallization rate increases as the cooling rate increases according to the analysis of Jeziorny's theory. The results of Mo's theory suggest that a faster cooling rate is required to reach a higher relative degree of crystallinity in a unit of time, and crystallization rate decreases when the relative degree of crystallinity increases at nonisothermal crystallization conditions.

关键词: Crystallization kinetics, Nylon, Activation energy, Differential scanning calorimetry

Abstract: Bio-sourced nylon 69, one of promising engineering plastics, has a great potential in developing sustainable technology and various commercial applications. Isothermal and nonisothermal crystallization kinetics of nylon 69 is a base to optimize the process conditions and establish the structure-property correlations for nylon 69, and it is also highly beneficial for successful applications of nylon products in industry. Isothermal and nonisothermal crystallization kinetics has been investigated by differential scanning calorimetry for nylon 69, bio-sourced even-odd nylon. The isothermal crystallization kinetics has been analyzed by the Avrami equation, the calculated Avrami exponent at various crystallization temperatures falls into the range of 2.28 and 2.86. In addition, the Avrami equation modified by Jeziorny and the equation suggested by Mo have been adopted to study the nonisothermal crystallization. The activation energies for isothermal and nonisothermal crystallization have also been determined. The study demonstrates that the crystallization model of nylon 69 might be a twodimensional (circular) growth at both isothermal and nonisothermal crystallization conditions. Furthermore, the value of the crystallization rate parameter (K) decreases significantly but the crystallization half-time (t_1/2) increases with the increase of the isothermal crystallization temperature. To nonisothermal crystallization, the crystallization rate increases as the cooling rate increases according to the analysis of Jeziorny's theory. The results of Mo's theory suggest that a faster cooling rate is required to reach a higher relative degree of crystallinity in a unit of time, and crystallization rate decreases when the relative degree of crystallinity increases at nonisothermal crystallization conditions.

Key words: Crystallization kinetics, Nylon, Activation energy, Differential scanning calorimetry

Zhijuan Sun, XiaoWang, Fei Guo, Chunyue Jiang, Qinmin Pan. Isothermal and nonisothermal crystallization kinetics of bio-sourced nylon 69[J]. Chinese Journal of Chemical Engineering, 2016, 24(5): 638-645.

Zhijuan Sun, XiaoWang, Fei Guo, Chunyue Jiang, Qinmin Pan. Isothermal and nonisothermal crystallization kinetics of bio-sourced nylon 69[J]. Chin.J.Chem.Eng., 2016, 24(5): 638-645.

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Isothermal and nonisothermal crystallization kinetics of bio-sourced nylon 69

Isothermal and nonisothermal crystallization kinetics of bio-sourced nylon 69

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