Photo-oxidative stabilization of carbon nanotubes on polylactic acid

被引：43

作者：

Gorrasi, Giuliana ^{[1
]}

Sorrentino, Andrea ^{[2
]}

机构：

[1] Univ Salerno, Dept Ind Engn, I-84084 Salerno, Italy

[2] Inst Composite & Biomed Mat IMCB, CNR, I-80055 Portici, NA, Italy

来源：

POLYMER DEGRADATION AND STABILITY | 2013年 / 98卷 / 05期

关键词：

Multiwall carbon nanotubes (MWCNTs); Photo-degradation; Polylactic acid (PLA) composites; Electrical conductivity; Thermal analysis; Mechanical properties; HIGH-DENSITY POLYETHYLENE; MECHANICAL-PROPERTIES; PLASTIC FILMS; PHOTODEGRADATION; DEGRADATION; POLYMER; OXYGEN; BLACK; POLYPROPYLENE; COMPOSITES;

D O I：

10.1016/j.polymdegradstab.2013.02.012

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

This paper aims to study the effect of multiwall carbon nanotubes (MWCNTs) on the photo-degradation behavior of polylactic acid (PLA) composites exposed to UV-light. The MWCNT dispersion state within the PLA matrix was analyzed by electrical conductivity measurements. From gel permeation chromatography it was verified that the rate of photo-degradation of PLA/MWCNT composites is lower than that of the unfilled PLA. The surface morphology modifications induced by UV have been analyzed by optical and scanning electron microscopy. Thermal analysis revealed an increase in the polymer crystallinity and a decrease in the degradation temperature during the UV treatment. The mechanical properties (Young's modulus and tensile strength at the yield point) were significantly increased by the addition of MWCNTs. However, the tensile strength and strain to failure slightly decreased with an increase in irradiation time. This complex behavior was attributed to a molecular reorganization in the first period of photo-aging followed by a severe macromolecular chain scission. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：963 / 971

页数：9

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