US EPA

6600357 

Journal Article 

Study of multi-monomer melt-grafting onto polypropylene in an extruder 

Xie, XM; Chen, NH; Guo, BH; Li, S; , 

2000 

1 

Polymer International
ISSN: 0959-8103 

JOHN WILEY & SONS LTD 

W SUSSEX 

49 

12 

1677-1683 

English 

10.1002/1097-0126(200012)49:12<1677::AID-PI590>3.0.CO;2-0 

WOS:000165853700021 

https://www.scopus.com/inward/record.uri?eid=2-s2.0-0034351057&doi=10.1002%2f1097-0126%28200012%2949%3a12%3c1677%3a%3aAID-PI590%3e3.0.CO%3b2-0&partnerID=40&md5=48ab1514bd78aa8cbb0202f2a89e4880
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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 beta -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 beta -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. (C) 2000 Society of Chemical Industry.