Transport properties of organic vapors in nanocomposites of organophilic layered silicate and syndiotactic polypropylene

被引:80
作者
Gorrasi, G
Tortora, M
Vittoria, V
Kaempfer, D
Mülhaupt, R
机构
[1] Univ Salerno, Dipartimento Ingn Chim & Alimentare, I-84084 Fisciano, SA, Italy
[2] Univ Freiburg, Freiburger Mat Forschungszentrum, D-79104 Freiburg, Germany
[3] Univ Freiburg, Inst Makromol Chem, D-79104 Freiburg, Germany
关键词
nanocomposites; sorption; diffusion;
D O I
10.1016/S0032-3861(03)00284-2
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Syndiotactic polypropylene (sPP) nanocomposites were obtained by melt blending synthetic fluorohectorite modified octadecyl ammonium. ions (OLS), and maleic-anhydride-grafted isotactic polypropylene (iPP-g-MA) as compatibilizer. The composition of the inorganic material was varied between 5 and 20 w/w%. Films of the composites were obtained by hot press molding the pellets. Melt-direct polymer intercalation of sPP into the OLS gave rise to nanocomposites in which the silicate layers were delaminated at low clay contents, and ordered to intercalated structures at the highest clay content. The elastic modulus was higher than for the pure polymer in a wide temperature range and increased with the inorganic content. The transport properties were measured for dichloromethane and n-pentane. The sorption was reduced compared to pure sPP. There were not significative differences between the samples having different inorganic contents. The diffusion coefficient decreased with increasing clay content. Permeability (P) showed a strong decreasing dependence on the clay content. The improvement of the barrier properties was largely caused by the reduced diffusion. (C) 2003 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:3679 / 3685
页数:7
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