Preparation of PS-b-PLLA Single Crystals and PS-b-PLLA/PLLA Composite Crystals and Their Thermodynamic Stability

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	Preparation of PS-b-PLLA Single Crystals and PS-b-PLLA/PLLA Composite Crystals and Their Thermodynamic Stability
	Ma, Cun-gui 1,2; Jiang, Chun-bo 1,2; Huang, Hai-ying 1,2; Zhang, Fa-jun 3; He, Tian-bai 1,2
刊名	ACTA POLYMERICA SINICA
	2014-07-20
期号	7 页码:896-907
关键词	Self-seeding Technique Single Crystals Composite Single Crystals Thermal Stability Dsc
ISSN号	1000-3304
英文摘要	In this study, the effects of the various control parameters in preparing high quality PS-b-PLLA single crystals as well as PS-b-PLLA/PLLA composite single crystals and their thermodynamic properties in solutions and in the bulk state are reported. Main control parameters including the seeding temperature (T-s) and time (t(s)), crystallization temperature (T-c) are discussed based on their effects on the size and its distribution, shape and thickness of the resulting crystals. In general, increasing T-s and t(c) lead to larger crystals with narrower distributions. Increasing To leads to a morphology transition from lozenge to truncated lozenge. DSC thermal analysis show that while the single crystals in solution have one melting point, the DSC profiles show a significant melting and recrystallization behavior in the bulk state after removing the solvent, which suggests that the crystals are under a metastable state in the bulk. Interestingly, when crystals are annealed at different temperatures below the onset melting point, the DSC heating profiles show similar initial melting point and the recrystallization process, indicating that the thermodynamic stability of the crystals does not change upon annealing. These results further suggest that the lamellar thickening via a-relaxation in the PLLA lamellar crystals is prohibited and the high thermodynamic stability of crystals can be achieved only by recrystallization.
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000340023000004
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/51099]
专题	中国科学院化学研究所
通讯作者	He, Tian-bai
作者单位	1.Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Univ Tubingen, Inst Angew Phys, D-72076 Tubingen, Germany
推荐引用方式 GB/T 7714	Ma, Cun-gui,Jiang, Chun-bo,Huang, Hai-ying,et al. Preparation of PS-b-PLLA Single Crystals and PS-b-PLLA/PLLA Composite Crystals and Their Thermodynamic Stability[J]. ACTA POLYMERICA SINICA,2014(7):896-907.
APA	Ma, Cun-gui,Jiang, Chun-bo,Huang, Hai-ying,Zhang, Fa-jun,&He, Tian-bai.(2014).Preparation of PS-b-PLLA Single Crystals and PS-b-PLLA/PLLA Composite Crystals and Their Thermodynamic Stability.ACTA POLYMERICA SINICA(7),896-907.
MLA	Ma, Cun-gui,et al."Preparation of PS-b-PLLA Single Crystals and PS-b-PLLA/PLLA Composite Crystals and Their Thermodynamic Stability".ACTA POLYMERICA SINICA .7(2014):896-907.