Deformation and structure evolution of glassy poly(lactic acid) below the glass transition temperature

	Deformation and structure evolution of glassy poly(lactic acid) below the glass transition temperature
	Zhou, Chengbo 1; Li, Hongfei 2; Zhang, Yao 1; Xue, Feifei 1; Huang, Shaoyong 3; Wen, Huiying 4; Li, Jingqing 1; Christiansen, Jesper de Claville 5; Yu, Donghong 6; Wu, Zhonghua 7
刊名	CRYSTENGCOMM
	2015
卷号	17 期号:30 页码:5651-5663
英文摘要	Poly(lactic acid) (PLA) is a bio-based and compostable thermoplastic polyester that has rapidly evolved into a competitive commodity material over the last decade. One key bottleneck in expanding the field of application of PLA is the control of its structure and properties. Therefore, in situ investigations under cooling are necessary for understanding the relationship between them. The most intriguing feature of a supercooled liquid is its dramatic rise in viscosity as it is cooled toward the glass transition temperature (T-g) though accompanied by very little change in the structural features observable by typical X-ray experiments. The deformation behaviors and structure evolution of glassy PLA during uniaxially stretching below Tg were investigated in situ by synchrotron small-angle X-ray scattering (SAXS) and wide-angle X-ray scattering (WAXS) techniques. The stretched samples were measured by differential scanning calorimetry (DSC). The obtained results showed that the deformation and yield stress of glassy PLA are strongly dependent on the stretching temperatures together with the transition from mesophase to mesocrystal and the formation of cavities. With the increase in drawing temperature, the onset of the mesocrystal formation is delayed to a higher strain value, whereas corresponding to the same critical orientation degree of amorphous chains (f(am) approximate to 0.45). The DSC results indicated that the post-T-g endothermic peak corresponding to the melting of mesocrystal appears and shifts to a higher temperature with increasing stretching temperature, followed by the down-shifts (to a lower temperature) of the exothermic peak of cold crystallization of PLA. The appearance of a small exothermic peak just before the melting peak related to the transition of the alpha' to alpha crystal implies the formation of an alpha' crystal during cold crystallization in the drawn PLA samples. The structure evolution of glassy PLA stretched below T-g was discussed in details.
收录类别	SCI
语种	英语
公开日期	2015-10-27
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/27866]
专题	化学研究所_高分子物理与化学实验室
作者单位	1.Tianjin Univ, Sch Mat Sci & Engn, Tianjin 300072, Peoples R China 2.Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China 3.Chinese Acad Sci, Changchun Inst Appl Chem, Key Lab Polymer Ecomat, Changchun 130022, Peoples R China 4.Northeast Forestry Univ, Coll Engn & Technol, Harbin 150040, Peoples R China 5.Aalborg Univ, Dept Mech & Mfg Engn, DK-9220 Aalborg, Denmark 6.Aalborg Univ, Dept Chem & Biosci, DK-9220 Aalborg, Denmark 7.Chinese Acad Sci, Inst High Energy Phys, Beijing Synchrotron Radiat Lab, Beijing 100039, Peoples R China
推荐引用方式 GB/T 7714	Zhou, Chengbo,Li, Hongfei,Zhang, Yao,et al. Deformation and structure evolution of glassy poly(lactic acid) below the glass transition temperature[J]. CRYSTENGCOMM,2015,17(30):5651-5663.
APA	Zhou, Chengbo.,Li, Hongfei.,Zhang, Yao.,Xue, Feifei.,Huang, Shaoyong.,...&Jiang, Shichun.(2015).Deformation and structure evolution of glassy poly(lactic acid) below the glass transition temperature.CRYSTENGCOMM,17(30),5651-5663.
MLA	Zhou, Chengbo,et al."Deformation and structure evolution of glassy poly(lactic acid) below the glass transition temperature".CRYSTENGCOMM 17.30(2015):5651-5663.