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Effect of Environmental Temperature on Ultraviolet Irradiated PP and its Composite.pdf

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Effect of Environmental Temperature on Ultraviolet Irradiated PP and its Composite

Effect of Environmental Temperature on Ultraviolet Irradiated PP and its Composite MIN QIAO,1 SHI-SHAN WU1,* AND JIAN SHEN1,2 1School of Chemistry and Chemical Engineering Nanjing University, Nanjing 210093, P. R. China 2College of Chemistry and Environment Science Nanjing Normal University, Nanjing 210097, P. R. China QIAN-PING RAN Jiangsu Institute of Building Science Co. Ltd Nanjing 210008, P. R. China 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 compatibiliza- tion of PP (irradiated at high environmental temperature for short time) was equivalent with that of PP (irradiated at low environmental temperature for long time). KEY WORDS: polypropylene, composite, ultraviolet irradiation, compatibilization. Journal of THERMOPLASTIC COMPOSITE MATERIALS, Vol. 23—January 2010 137 0892-7057/10/01 0137–12 $10.00/0 DOI: 10.1177/0892705708096573 SAGE Publications 2009 Los Angeles, London, New Delhi and Singapore *Author to whom correspondence sh