蚕丝纤维增强聚乳酸体系中柱晶的形成及结构分析

doi:10.7503/cjcu20170194

高等学校化学学报 ›› 2017, Vol. 38 ›› Issue (9): 1663.doi: 10.7503/cjcu20170194

蚕丝纤维增强聚乳酸体系中柱晶的形成及结构分析

李桂丽^1,², 黄静静¹, 张欢欢¹, 袁朝圣³, 邵春光¹(), 应进¹, 王亚明¹, 曹伟¹, 刘春太¹, 申长雨¹

1. 郑州大学, 橡塑模具国家工程研究中心,2. 材料科学与工程学院, 郑州 450001
3. 郑州轻工业学院高压科学与技术研究中心, 郑州 450001

收稿日期:2017-03-31 出版日期:2017-09-10 发布日期:2017-07-21
作者简介:联系人简介: 邵春光, 男, 博士, 副教授, 主要从事高分子材料加工中的物理学研究. E-mail: shaochg@zzu.edu.cn
基金资助:
国家自然科学基金(批准号: 51573171, 21503194)和郑州大学优秀青年教师发展基金(批准号: 1521502001)资助

Formation and Structure Analysis of Interfacial Cylindrites Induced by Silkworm Silk Fiber in Poly(lactic acid) Based Composites^†

LI Guili^1,², HUANG Jingjing¹, ZHANG Huanhuan¹, YUAN Chaosheng³, SHAO Chunguang^1,^*(), YING Jin¹, WANG Yaming¹, CAO Wei¹, LIU Chuntai¹, SHEN Changyu¹

1. National Engineering Research Center for Advanced Polymer Processing Technology,2. School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China
3. High Pressure Research Center of Science and Technology, Zhengzhou University of Light Industry;Zhengzhou 450001, China

Received:2017-03-31 Online:2017-09-10 Published:2017-07-21
Contact: SHAO Chunguang E-mail:shaochg@zzu.edu.cn
Supported by:
† Supported by the National Natural Science Foundation of China(Nos.51573171, 21503194) and the Outstanding Young Talent Research Fund of Zhengzhou University, China(No.1521502001)

摘要/Abstract

摘要：

采用溶液法制备聚乳酸(PLA)薄膜, 并利用偏光显微镜在线研究了不同温度及不同牵引速率下, 单根蚕丝纤维(SF)诱导PLA柱晶的形成, 并利用显微红外光谱表征柱晶结构. 结果表明, 当牵引速率大于或等于临界速率时, 纤维表面有连续的柱晶生成, 反之柱晶不连续; 当牵引速率大于临界饱和速率时, 柱晶的结晶度和取向度分别趋于稳定值; 在等温条件下, 随着牵引速率的增大, 柱晶的成核诱导期缩短, 晶体的成核密度增大, 取向度增加; 当牵引速率一定时, 与130 ℃相比, 温度为120 ℃时形成柱晶的成核诱导期较短, 成核密度更大, 结晶度更高, 柱晶层的生长更快.

关键词: 聚乳酸, 蚕丝纤维, 柱晶, 牵引速率

Abstract:

Thin films of poly(lactic acid)(PLA) were prepared using solution method. At different temperatures and fiber-pulling speeds, the morphology of cylindrites induced by a single silkworm silk fiber(SF) in PLA films was investigated by polarized optical microscopy(POM) and Fourier transform infrared spectroscopy(FTIR). The results show that there is a critical fiber-pulling speed, above which the continuous cylindrites structure could be generated on the fiber surface, whereas discontinuous cylindrites would form at a speed lower than that value. Besides, there also exists another special speed defined as saturation fiber-pulling speed, and once the pulling rate exceeds that value, the degree of crystallization and orientation will reach a plateau. Moreover, at the same temperature, the induction period of cylindrites nuclei reduces and its nuclei density and the orientation increase with raising the fiber-pulling speed; under a given fiber-pulling speed, compared to 130 ℃, the induction period of cylindrites is shorter, and its nuclei density, growth rate as well as final crystallinity are much higher at 120 ℃.

Key words: Poly(lactic acid), Silkworm silk fiber, Cylindrite, Fiber-pulling speed

中图分类号:

O631

TrendMD:

李桂丽, 黄静静, 张欢欢, 袁朝圣, 邵春光, 应进, 王亚明, 曹伟, 刘春太, 申长雨. 蚕丝纤维增强聚乳酸体系中柱晶的形成及结构分析. 高等学校化学学报, 2017, 38(9): 1663.

LI Guili, HUANG Jingjing, ZHANG Huanhuan, YUAN Chaosheng, SHAO Chunguang, YING Jin, WANG Yaming, CAO Wei, LIU Chuntai, SHEN Changyu. Formation and Structure Analysis of Interfacial Cylindrites Induced by Silkworm Silk Fiber in Poly(lactic acid) Based Composites^†. Chem. J. Chinese Universities, 2017, 38(9): 1663.

图/表 8

Fig.1 Schematic representations of the experimental installation(A) and applied thermo-mechanical history(B)

Fig.2 Crystalline morphologies of PLA under different crystallization temperatures Crystallization temperature/℃: (A) 100;(B) 110;(C) 120;(D) 130.

Fig.3 POM observation images of crystalline evolution induced by fiber-pullingCrystallization temperature/℃: (A) 120; (B) 130.

Table 1 Effect of different temperature on critical fiber-pulling speed

Temperature/℃	Critical fiber-pulling speed/(μm·s^-1)
Temperature/℃	String shape spherulite	Cylindrite	Saturation	Broken
120	5	40		150
130	10	50	100	250

Fig.4 Nuclei density on the surface of SF vs. crystallization time(A and B) and induction time(C) and the nuclei density of the cylindrites crystallized for 380 s(D) vs. fiber-pulling speedCrystallization temperature/℃: (A) 120; (B) 130.

Fig.5 Radius of the cylindrites vs. crystallization time at 120(A) and 130 ℃(B), and the growth rate of crystals(C) vs. fiber-pulling speed

Fig.6 IR spectra of PLA cylindrites crystallized at 130 ℃(A) and change of Xc(B) vs. fiber-pulling speedInset is the FTIR detection area(dashed area).

Fig.7 Polarized IR spectra of PLA cylindrites crystallized at 130 ℃(A) and changes of the dichroic ratio(B) as a function of fiber-pulling speedFiber-pulling speed/(μm·s-1): a. 40; b. 60; c. 80; d. 100; e. 200. Inset is the FTIR detetion area(dashed area).

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蚕丝纤维增强聚乳酸体系中柱晶的形成及结构分析

Formation and Structure Analysis of Interfacial Cylindrites Induced by Silkworm Silk Fiber in Poly(lactic acid) Based Composites^†

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蚕丝纤维增强聚乳酸体系中柱晶的形成及结构分析

Formation and Structure Analysis of Interfacial Cylindrites Induced by Silkworm Silk Fiber in Poly(lactic acid) Based Composites†

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Formation and Structure Analysis of Interfacial Cylindrites Induced by Silkworm Silk Fiber in Poly(lactic acid) Based Composites^†