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Citation: XU Qun, HOU Zhen-Zhong, ZHANG Yan-Chao, HUANG He. Supercritical CO₂-Assisted Multi-Monomer Graft Copolymerization of Polypropylene[J]. Chinese Journal of Applied Chemistry, ;2007, 24(4): 416-419. shu

Supercritical CO₂-Assisted Multi-Monomer Graft Copolymerization of Polypropylene

1.
College of Materials Engineering, Zhengzhou University, Zhengzhou 450052

Corresponding author: XU Qun,
Received Date: 18 May 2006
Available Online: 15 August 2006
Fund Project: 河南省杰出青年科学基金(0512001200) (0512001200)河南省自然科学基金(0411020900)资助项目 (0411020900)

The monomers maleic acid anhydride(MAH),styrene monomer(St) and initiator were dissolved in supercritical CO₂,which was used as swelling agent and carrier to help these molecules impregnate into polypropylene(PP) matrix.Then impregnated molecules were grafted at 100℃ for 4 h to modify the matrix.The effects of different experimental conditions such as impregnation temperature,supercritical CO₂ pressure and initiator concentration on grafting were studied.FT-IR results and SEM analysis of the grafted sample indicte that the monomers were indeed grafted onto PP chains.DSC results show that the melting point(T_m) and apparent crystallinity(C_a) decreased with the grafting rate increasing,which is due to the grafted branches that disrupt the regularity of the chain structure and increase the spaces between the chains.
- supercritical CO₂,
- polypropylene,
- maleic anhydride,
- styrene,
- grafting
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Supercritical CO₂-Assisted Multi-Monomer Graft Copolymerization of Polypropylene