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Solid‐phase grafting of glycidyl methacrylate onto polypropylene
Author(s) -
Pan Yongkang,
Ruan Jimin,
Zhou Dafei
Publication year - 1997
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19970906)65:10<1905::aid-app7>3.0.co;2-j
Subject(s) - glycidyl methacrylate , benzoyl peroxide , polypropylene , grafting , materials science , polymer chemistry , monomer , chemical engineering , activation energy , crystallization , melting point , yield (engineering) , composite material , chemistry , polymer , organic chemistry , engineering
Free‐radical grafting of glycidyl methacrylate (GMA) onto polypropylene (PP) powder was studied in a batch mixer. The reaction temperature was below the melting point of PP so that PP was modified in the solid phase. The graft yield of GMA obtained under various experimental conditions allowed for a good appreciation of the effects of chemical parameters (the concentration of monomer, initiator, and interfacial agent) and those of processing parameters (reaction time and temperature). Toluene was used as an interfacial agent to etch the surface of PP powder to provide more sites for reaction. Quantitative determination of the graft level was performed by wet chemical methods. The results showed that the solid‐phase grafting could take place over a temperature range of 100–140°C in the initiation of benzoyl peroxide (BPO). The ultimate GMA grafting level achieved was higher than that obtained in the melt state with dicumyl peroxide (DCPO) as a radical initiator. The grafting of GMA affected the crystalline morphology of PP and speeded up the crystallization process. The energy of activation and initial decomposition temperature of grafted samples were higher than those of ungrafted PP. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 65: 1905–1912, 1997