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Journal of Thermoplastic Composite Materials
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Article

Effect of Environmental Temperature on Ultraviolet Irradiated PP and Its composite

Shi-Shan Wu*, Min Qiao, and Jian Shen

Nanjing University

* To whom correspondence should be addressed. E-mail: shishanwu{at}yahoo.com.cn.


  Abstract

Some oxygen-containing groups such as C–O and C=O were introduced onto the molecular chains of polypropylene (PP) through ultraviolet irradiation at different environmental temperatures in air. The concentration of the oxygen-containing groups was increased with the increasing environmental temperature after the same ultraviolet irradiation time. After irradiation at different environmental temperatures, there was no gel formed in PP. The crystal shape of irradiated PP kept unchanged, which was still monoclinic crystal. After the same ultraviolet irradiation time, the melt temperature of the irradiated PP decreased and its crystallinity was increased with the increasing environmental temperature. Compared with those of PP, the melt flow rate and hydrophilicity of the irradiated PP was improved, and their variation ranges was expanded with the increasing environmental temperature. The mechanical properties of PP/CaCO3 composite compatibilized by irradiated PP at different environmental temperatures were enhanced compared with those of PP/CaCO3 composite. Besides, the compatibilization of PP (irradiated at high environmental temperature for short time) was equivalent with that of PP (irradiated at low environmental temperature for long time).

First published on June 19, 2009
Journal of Thermoplastic Composite Materials 2009, doi:10.1177/0892705709096573
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