Preparation of PS-b-PLLA Single Crystals and PS-b-PLLA/PLLA Composite Crystals and Their Thermodynamic Stability
文献类型：期刊论文
| 作者 | Ma, Cun-gui1,2; Jiang, Chun-bo1,2; Huang, Hai-ying1,2; Zhang, Fa-jun3; He, Tian-bai1,2 |
| 刊名 | ACTA POLYMERICA SINICA
 |
| 出版日期 | 2014-07-20 |
| 期号 | 7页码:896-907 |
| ISSN号 | 1000-3304 |
| 关键词 | Self-seeding Technique Single Crystals Composite Single Crystals Thermal Stability Dsc |
| 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 |
| 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. |
入库方式： OAI收割
来源：化学研究所
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