Study on crosslinking side reaction in maleic anhydride modification of polypropylene

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School of Chemical and Energy Engineering, South China University of Technology, Guangzhou 510640, China ^{[1
]}

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Hecheng Shuzhi Ji Suliao | 2007年 / 3卷 / 10-12+28期

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摘要：

Maleic anhydride (MAH) with and without additive was used to modify polypropylene (PP) via melt grafting reaction. The influence of dosage of MAH monomer, dicumyl peroxide (DCP) initiator and triphenyl phosphate (TPP) additive on crosslinking of PP was studied. The crosslinking side reaction of PP was caused by the macromolecular free radicals of PP originated from the initiation by DCP and from MAH molecules in excited state. The electron donor contained in TPP could weak the tendency of positive charge induction created by methyl on the PP macromolecule, prevent transfer reaction of free radical inside PP and transfer reaction between the macromolecules from happening and accordingly, could abate the cross-linking reaction of PP. The P atoms contained in the TPP compound and the MAH molecules in excited state could generate the electron transfer function, make concentration of MAH molecules in excited state diminish and sequentially, reduce the cross-linking reaction of PP.

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