Direct Comparison of Crystal Nucleation Activity of PCL on Patterned Substrates  

作　　者：Jian Hu Rui Xin Chun-Yue Hou Shou-Ke Yan Ji-Chun Liu 

机构地区：[1]Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-plastics, Qingdao University of Science & Technology [2]College of Chemical Engineering and Pharmaceutics, Key Laboratory of Polymer Science and Nanotechonology, Henan University of Science and Technology

出　　处：《Chinese Journal of Polymer Science》2019年第7期693-699,共7页高分子科学（英文版）

摘　　要：A sample containing different regions with poly(ε-caprolactone)(PCL), oriented polyethylene (PE), and oriented isotactic polypropylene (iPP) films in contact with glass slide has been prepared to be observed in the same view field in an optical microscope and the crystallization of PCL in different regions during cooling from 80 °C down to room temperature at a rate of 1 °C·min^-1 was studied. The results showed that the crystallization of PCL started first at the PE surface and then at the iPP surface, while its bulk crystallization occured much later. This indicates that though both PE and iPP are active in nucleating PCL, the nucleation ability of PE is stronger than that of iPP. This was due to a better lattice matching between PCL and PE than that between PCL and iPP. Moreover, since lattice matching existed between every (hk0) lattice planes of both PCL and PE but only between the (100)PCL and (010)iPP lattice planes, the uniaxial orientation feature of the used PE and iPP films resulted in the existence of much more active nucleation sites of PCL on PE than on iPP. This led to the fact that the nucleation density of PCL at PE surface was so high that the crystallization of PCL at PE surface took place in a way like the film developing process with PCL microcrystallites happened everywhere with crystallization proceeding simultaneously. On the other hand, even though iPP also enhanced the nucleation density of PCL evidently, the crystallization of PCL at iPP surface included still a nucleation and crystal growth processes similar to that of its bulk crystallization.A sample containing different regions with poly(ε-caprolactone)(PCL), oriented polyethylene(PE), and oriented isotactic polypropylene(i PP) films in contact with glass slide has been prepared to be observed in the same view field in an optical microscope and the crystallization of PCL in different regions during cooling from 80 °C down to room temperature at a rate of 1 °C·min1-was studied.The results showed that the crystallization of PCL started first at the PE surface and then at the i PP surface, while its bulk crystallization occured much later. This indicates that though both PE and i PP are active in nucleating PCL, the nucleation ability of PE is stronger than that of i PP. This was due to a better lattice matching between PCL and PE than that between PCL and i PP. Moreover, since lattice matching existed between every(hk0) lattice planes of both PCL and PE but only between the(100)PCL and(010)i PP lattice planes, the uniaxial orientation feature of the used PE and i PP films resulted in the existence of much more active nucleation sites of PCL on PE than on i PP. This led to the fact that the nucleation density of PCL at PE surface was so high that the crystallization of PCL at PE surface took place in a way like the film developing process with PCL microcrystallites happened everywhere with crystallization proceeding simultaneously. On the other hand, even though i PP also enhanced the nucleation density of PCL evidently, the crystallization of PCL at i PP surface included still a nucleation and crystal growth processes similar to that of its bulk crystallization.

关 键 词：Poly(ε-caprolactone) POLYPROPYLENE POLYETHYLENE EPITAXY Heterogeneous NUCLEATION 

分 类 号：O6[理学—化学]