PVCH-PE-PVCH三嵌段共聚物在超临界CO_2中的熔融再结晶行为  

Melting and Recrystallization Behaviour of PVCH-PE-PVCH Triblock Copolymer in Supercritical CO_(2)

作　　者：于佩潜[1] 谢续明[1] 王涛[2] Frank S.Bates 

机构地区：[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

出　　处：《高等学校化学学报》2006年第7期1389-1391,共3页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:50573038;20174022;10334020);教育部博士学科点基金(批准号:20040003033)资助

摘　　要：The melting and recrystallization behaviour of poly（vinylcyclohexane）-b-poly（ethylene）-b-poly（vinylcyclohexane）（PVCH-PE-PVCH） triblock copolymer in supercritical carbon dioxide(CO2) was investigated by（using） of DSC.The effect of the rate of the depressurization of CO2 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 CO2 at the temperature above tm 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 CO2.The melting and recrystallization behaviour of poly （ vinylcyclohexane ） -b-poly （ethylene） -b-poly （vinylcyclohexane） （ PVCH-PE-PVCH ） triblock copolymer in supercritical carbon dioxide （ CO2 ） was investigated by using of DSC. The effect of the rate of the depressurization of CO2 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 CO2 at the temperature above tm 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 CO2.

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 

分 类 号：O631[理学—高分子化学]