Shear effects on crystalline structures of poly(L-lactide)

Peitao Xiao; Hongfei Li; Shaoyong Huang; Huiying Wen; Donghong Yu; Yingrui Shang; Jingqing Li; Zhonghua Wu; Lijia An; Shichun Jiang

doi:10.1039/C3CE40466H

Shear effects on crystalline structures of poly(l-lactide)

Peitao Xiao,^a Hongfei Li,*^b Shaoyong Huang,^c Huiying Wen,^d Donghong Yu,^e Yingrui Shang,^a Jingqing Li,^a Zhonghua Wu,^f Lijia An^b and Shichun Jiang*^a

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* Corresponding authors

^a School of Materials Science and Engineering, Tianjin University, Tianjin 300072, P. R. China
E-mail: scjiang@tju.edu.cn

^b State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China
E-mail: hfli@ciac.ac.cn

^c Key Laboratory of Polymer Eco-materials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China

^d College of Engineering and Technology, Northeast Forestry University, Harbin 150040, P. R. China

^e Department of Biotechnology, Chemistry, and Environmental Engineering, Aalborg University, DK-9000, Aalborg, Denmark

^f Beijing Synchrotron Radiation Laboratory, Institute of High Energy Physics, Chinese Academy of Science, Beijing 100039, P. R. China

Abstract

The shearing effects of sheared polymer melts on their finally formed crystalline structures of poly(L-lactide) (PLLA) were investigated by means of small angle X-ray scattering (SAXS) and wide angle X-ray diffraction (WAXD). The results of WAXD prove that shear has no effects on the crystal structure of PLLA. The SAXS results demonstrate that both of the long period and the thickness of crystalline lamellae increase with rising shear rates when vertical to the shear direction, but remains constant when being parallel to the shear direction. The structural changes for samples prepared with different shear temperature or under the same shear strain but different shear rate were investigated. The mesophase of polymer melts and shearing effects on their pre-ordered phase turned out to be the key factor affecting the crystal structure of PLLA under different shearing conditions.

CrystEngComm

Shear effects on crystalline structures of poly(l-lactide)

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Shear effects on crystalline structures of poly(L-lactide)

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