Uniaxial stretching behavior of polylactide with long chain branching

详细信息    查看全文

• 作者：Jianye Liu ; Shijun Zhang ; Liying Zhang ; Yiqing Bai
• 关键词：Polylactide ; Long chain branching ; Uniaxial stretching ; Orientation ; induced crystallization
• 刊名：Colloid and Polymer Science
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：295
• 期：2
• 页码：297-306
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Polymer Sciences; Soft and Granular Matter, Complex Fluids and Microfluidics; Characterization and Evaluation of Materials; Physical Chemistry; Food Science; Nanotechnology and Microengineering;
• 出版者：Springer Berlin Heidelberg
• ISSN：1435-1536
• 卷排序：295

文摘

The investigation about the uniaxial stretching behavior of fully crystallized poly(L-lactide)s (PLLA) containing long chain branching (LCB) is carried out by two dimensional wide angle X-ray scattering (2D-WAXS) and differential scanning calorimetry (DSC). The controlled sample is the linear PLLA containing nucleating agents which owns the similar degree of crystallinity and crystalline morphologies as that of PLLA LCB. The results show that much more chain entanglements in the amorphous area of PLLA LCB make the LCB sample be able to bear much larger stress and then reach larger elongation when it breaks. Although the original lamellae are more difficult to be damaged in PLLA LCB due to the more chain entanglements compared with linear PLLA, the final crystal orientation is much better for it. The higher melting point indicates that the extended chain crystals in this stretched LCB sample are more perfect, especially at high drawing temperature. The original topological structure of chains is supposed to be the governing factor which determines the different evolution of crystalline structures under strain.