Crystallization and Orientation of Syndiotactic Polystyrene in Nanorods
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- 作者：Hui Wu ; Wei Wang ; Huixian Yang ; Zhaohui Su
- 刊名：Macromolecules
- 出版年：2007
- 出版时间：June 12, 2007
- 年：2007
- 卷：40
- 期：12
- 页码：4244 - 4249
- 全文大小：406K
- 年卷期：v.40,no.12(June 12, 2007)
- ISSN：1520-5835
文摘
Syndiotactic polystyrene (sPS) nanorods of 200 and 80 nm diameters were prepared by infiltratingporous anodic alumina oxide templates with polymer melt, and the crystallinity and orientation of various formsof sPS crystals in the nanorods were studied by FTIR spectroscopy and electron diffraction. For sPS crystallizedfrom amorphous state at lower temperatures, 
-form crystals were found in the nanorods with random orientationand the same degree of crystallinity as that in the bulk. However, for sPS crystallized from molten state at260 
C, while no preferred orientation was found for the chains in the melt, the 
-crystals formed in the nanorodsoriented preferentially with the c-axis aligning perpendicular to the axial direction of the nanorod, and the degreeof crystallinity was significantly lower than that in the bulk. The crystallinity decrease was more profound fornanorods of smaller diameter. These results were also supported by electron diffraction data and can be attributedto competition between nucleation and crystal growth in the nanotemplates.
-form crystals were found in the nanorods with random orientationand the same degree of crystallinity as that in the bulk. However, for sPS crystallized from molten state at260 C, while no preferred orientation was found for the chains in the melt, the -crystals formed in the nanorodsoriented preferentially with the c-axis aligning perpendicular to the axial direction of the nanorod, and the degreeof crystallinity was significantly lower than that in the bulk. The crystallinity decrease was more profound fornanorods of smaller diameter. These results were also supported by electron diffraction data and can be attributedto competition between nucleation and crystal growth in the nanotemplates.