Anisotropic Guest Diffusion in the Crystalline Host Phase of Syndiotactic Polystyrene: Transport Kinetics in Films with Three Diffe
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- 作者：Vincenzo Venditto ; Anna De Girolamo Del Mauro ; Giuseppe Mensitieri ; Giuseppe Milano ; Pellegrino Musto ; Paola Rizzo ; and Gaetano Guerra
- 刊名：Chemistry of Materials
- 出版年：2006
- 出版时间：May 2, 2006
- 年：2006
- 卷：18
- 期：9
- 页码：2205 - 2210
- 全文大小：176K
- 年卷期：v.18,no.9(May 2, 2006)
- ISSN：1520-5002
文摘
The sorption and desorption of a guest (1,2-dichloroethane) in syndiotactic polystyrene (s-PS) films,presenting three different kinds of uniplanar orientation ((010), (
10), or (002)) of the nanoporous host
phase, have been investigated, mainly by Fourier transform infrared measurements. For guest uptakefrom dilute aqueous solutions (e.g., 50 ppm), the sorption in the amorphous phase is negligible withrespect to sorption in the nanoporous crystalline phase. Correspondingly the guest sorption and desorptionkinetics are influenced by the orientation of the anisotropic host crystalline phase. In particular, as forthe guest diffusivity (D) measured by both sorption and desorption experiments, D(010) 
D(002) <D(unoriented) < D(10). These results can be rationalized on the basis of previous molecular dynamicssimulations, predicting an anisotropic guest diffusion in the crystalline phase.
10), or (002)) of the nanoporous host phase, have been investigated, mainly by Fourier transform infrared measurements. For guest uptakefrom dilute aqueous solutions (e.g., 50 ppm), the sorption in the amorphous phase is negligible withrespect to sorption in the nanoporous crystalline phase. Correspondingly the guest sorption and desorptionkinetics are influenced by the orientation of the anisotropic host crystalline phase. In particular, as forthe guest diffusivity (D) measured by both sorption and desorption experiments, D(010) D(002) <D(unoriented) < D(10). These results can be rationalized on the basis of previous molecular dynamicssimulations, predicting an anisotropic guest diffusion in the crystalline phase.