The anhydride content of some commercial PP-g-MA: FTIR and titration

Abstract

SYNOPSISA set of anhydride-grafted polypropylenes was collected from various companies. They were studied in light of our recent results on polypropylene melt grafted with maleic anhydride.' This work confirmed that an important decrease of the anhydride content is recorded on heating or washing, due to the elimination of free, ungrafted products, respectively, by sublimation of maleic anhydride and by polymaleic anhydride solubilization. The deconvolution of the infrared spectra of washed anhydride-grafted polypropylenes (PP-g-MA) revealed two types of grafted anhydride: succinic anhydride form and polymaleic anhydride form. All in all, four forms of anhydride functions were detected two grafted and two free, each being either on monomeric or polymeric forms. Nevertheless, one PPg-MA (Hercoprime) can be distinguished by its very high grafting level. This polymer is therefore discussed in more detail. Finally, all the present results are discussed with regard to the principal applications of the PP-g-MA as a blend compatiblizer or as an adhesion promoter.

Peroxide‐initiated grafting of maleic anhydride onto linear and branched hydrocarbons

“…In similar studies using PP, they also confirmed that the grafts exist as either single saturated units or unsaturated grafts consisting of an anhydride ring attached to the chain terminus via a double bond. This was contrary to the conclusions by Scalvons et al 7 who, using FTIR, suggested the formation of oligomeric and polymeric grafts. In the present work using 1% MAn in TMCH, only single saturated grafts are found.…”

“…In these latter studies, FTIR was used to characterize the graftmodified polymer and to distinguish the single grafts from oligomeric grafts and free homopolymer. In a subsequent study, 7 commercial samples of grafted polyolefin were analyzed and similar conclusions were reached. The results from FTIR were not confirmed using other techniques such as NMR.…”

Effects of polypropylene-g-dibutyl maleate on mechanical and rheological properties of PP/PA6 blends

“…The polypropylene (PP) was purchased from Panjin Chemical Factory; the Nylon 6 (PA6) was purchased from Allied Signal Corporation and dehumidified by using a vacuum oven at 80 0 C for 24 h before blending; the PP-g-DBM was synthesized by melt grafting in the presence of dicumyl peroxide (DCP) using twin screw extruder in our laboratory, percent grafting of PP-g-DBM was measured by chemical analysis [20].…”

Preparation and Characterization of Thermoplastic Elastomers/Plasticizer - Compatibilizer/Organoclay Nanocomposites by Reactive Extrusion System

“…Grafting of MA or other polar monomers onto NR backbone improves the compatibility between NR and other polar elastomers and some engineering plastics such as polyamide. According to several authors [53][54][55][56][57][58][59], the grafting process of MA onto polydienes, such as NR, styrene-isoprene, and styrene-butadiene-styrene block copolymer, involves two different mechanisms, i.e., radical-induced grafting and thermal grafting via an ene mechanism. For the ene mechanism, high temperature (160-240°C) is required for the fixation of MA to polydiene backbone.…”