Solid-phase grafting of glycidyl methacrylate onto polypropylene

Abstract

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 100-140ЊC 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.

RETRACTED: Functional polymers synthesized by grafting of glycidyl methacrylate onto swift heavy ions irradiated BOPP films using chemical initiator

“…the virgin BOPP. The obtained results are in agreement with the previously reported results by Pan et al [35].…”

Development of copper-charged polypropylene feedspacers for biofouling control

“…Then, via an SN2 reaction, IDA was added to the PP-graft-GMA [5]. The mean grafting level (GL%) for all of the sheets was approximately 40%; that is, over 3-4 times higher than those associated with other studies [8,10]. The high level of grafting observed is proposed to be due to uncontrolled radically initiated polymerization with high concentration of GMA monomer, which agrees with other studies [12,13].…”

“…Benzoyl peroxide (BPO) was used as a radical initiator for the graft polymerization of GMA to the PP surface at a temperature of 80 • C [5], or nearly half of temperatures outlined in the literature [10,11]. Then, via an SN2 reaction, IDA was added to the PP-graft-GMA [5].…”

Synthesis and properties of styrene-EPDM-vinyl acetate graft polymer

“…The increasing phenomena of the grafting ratio and grafting efficiency can be elucidated by the fact that the graft polymer was readily formed than each homopolymer. 27 The decrease in grafting ratio and grafting efficiency at higher initiator concentration can be explained by the opposition to explanation for the increasing phenomena. As a result, the grafting ratio and graft- ing efficiency depend on the formation of the desired graft polymer to that of other polymers, as expected from eqs.…”