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| PVCH-PE-PVCH三嵌段共聚物在超临界CO2中的熔融再结晶行为 | |
| 引用本文： | 于佩潜,谢续明,王涛,Frank S. Bates.PVCH-PE-PVCH三嵌段共聚物在超临界CO2中的熔融再结晶行为[J].高等学校化学学报,2006,27(7):1389-1391. |
| 作者姓名： | 于佩潜 谢续明 王涛 Frank S. Bates |
| 作者单位： | 1. 清华大学化学工程系高分子研究所,教育部先进材料重点实验室,北京,100084 2. 清华大学化学工程联合国家重点实验室,北京,100084 3. 明尼苏达大学化学工程与材料科学系,Minneapolis,MN 55455,USA |
| 基金项目： | 国家自然科学基金;高等学校博士学科点专项科研项目 |
| 摘 要： | 本研究组在前期研究中发现, 改变溶剂的挥发速率可以调节体系中PE结晶和PVCH玻璃化之间的竞争, 进而调节PE结晶的受限程度. 超临界二氧化碳(scCO2)是一种非极性溶剂, 其对无定形聚合物(如PS)有很强的溶胀作用, 可显著降低聚合物的玻璃化转变温度, 提高原来被冻结的高分子链的活动能力. PVCH的分子结构与PS相似, 研究结果表明, scCO2对PVCH组分也有很强的溶胀能力, 导致PVCH的玻璃化转变温度降低, 从而可以改变PE嵌段的受限状态. 本文研究了PVCH-PE-PVCH在scCO2中的熔融再结晶行为. |
| 关 键 词： | 聚乙烯基环己烷-聚乙烯-聚乙烯基环己烷(PVCH-PE-PVCH) 超临界CO2 熔融再结晶 |
| 文章编号： | 0251-0790（2006）07-1389-03 |
| 收稿时间： | 10 25 2005 12:00AM |
| 修稿时间： | 2005-10-25 |
Melting and Recrystallization Behaviour of PVCH-PE-PVCH Triblock Copolymer in Supercritical CO2 |
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| YU Pei-Qian,XIE Xu-Ming,WANG Tao,Frank S. Bates.Melting and Recrystallization Behaviour of PVCH-PE-PVCH Triblock Copolymer in Supercritical CO2[J].Chemical Research In Chinese Universities,2006,27(7):1389-1391. | |
| Authors: | YU Pei-Qian XIE Xu-Ming WANG Tao Frank S Bates |
| Institution: | 1. Institute of Polymer Science and Engineering, Department of Chemical Engineering, Key Laboratory of Advanced Materials, Ministry of Education; 2. State Key Laboratory of Chemical Engineering, Tsinghua University, Beijing 100084, China; 3. Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455, USA |
| Abstract: | The melting and recrystallization behaviour of poly(vinylcyclohexane)-b-poly(ethylene)-b-poly(vinylcyclohexane)(PVCH-PE-PVCH) triblock copolymer in supercritical carbon dioxide(CO_(2)) was investigated by(using) of DSC.The effect of the rate of the depressurization of CO_(2) on the crystallization of the samples was also examined.It is found that there are three melting peaks on each DSC curve of the samples treated in supericritical CO_(2) at the temperature above t_(m) of the untreated PVCH-PE-PVCH.They corresponded to the "hard" confined crystallization of PE blocks homogeneous nucleation,the "soft" confined crystallization of PE blocks homogeneous nucleation and the self-seeding nucleation free crystallization of PE blocks respectively.Furthermore,these three kinds of crystallization could be controlled by changing the competition between the crystallization of PE block and the vitrifaction of PVCH block in the samples,which depended on the rate of the depressurization of CO_(2). |
| Keywords: | PVCH-PE-PVCH Supercritical CO_2 Melting and recrystalliztion |
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