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Study of multi‐monomer melt‐grafting onto polypropylene in an extruder
Author(s) -
Xie XuMing,
Chen NianHuan,
Guo BaoHua,
Li Song
Publication year - 2000
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/1097-0126(200012)49:12<1677::aid-pi590>3.0.co;2-0
Subject(s) - glycidyl methacrylate , comonomer , monomer , polymer chemistry , grafting , polypropylene , materials science , melt flow index , styrene , methacrylate , radical initiator , radical polymerization , benzoyl peroxide , chemical engineering , copolymer , polymer , composite material , engineering
Free‐radical melt‐grafting of the dual‐monomer systems glycidyl methacrylate–styrene (GMA‐St) and hydroxyethyl methacrylate–styrene (HEMA‐St) onto polypropylene (PP) has been studied using a single‐screw extruder. For single monomer grafting systems, degradation of PP was unavoidable and deterioration of the mechanical properties of the grafted PP subsequently occurred because of β‐scission of PP chains during the free‐radical melt‐grafting process. However, for the dual‐monomer systems, it is shown that the addition of styrene as a comonomer can significantly enhance the GMA or HEMA grafting levels on PP and reduce the extent of β‐scission of PP backbone. It has been found that the grafting degree of dual‐monomer melt‐grafted PP, such as PP‐ g ‐(GMA‐ co ‐St) or PP‐ g ‐(HEMA‐ co ‐St), is about quadruple that of single‐monomer grafted PP for the same monomer and dicumyl peroxide concentrations. Moreover, the melt flow rate of the dual‐monomer grafted PP is smaller than that of the unmodified PP. Hence, PP not only was endowed with higher polarity, but also kept its good mechanical properties. © 2000 Society of Chemical Industry