Natural rubber maleic anhydride grafted

In addition, the compatibility of natural rubber and poly(methyl methacrylate) blends was improved by modification of the functional groups of the natural rubber molecules to be more hydrophilic. Nakasorn and coworkers synthesized maleated natural rubber by using maleic anhydride. Grafting maleic anhydride onto the backbone of the non-polar natural rubber overcame the disadvantage of the low surface energy of natural rubber. This improved the... 

A.W.M. Kahar, H. Ismail, N. Othman. Effects of polyethylene-grafted maleic anhydride as a compatibilizer on the morphology and tensile properties of (thermoplastic tapioca starch)/ (high-density polyethylene)/(natural rubber) blends... 

In addition it was observed that once the fraction of tertiary hydrogen positions reached 50 % in EPM (alternating ethylene-co-propylene copolymer fiom hydrogenation of natural rubber) the maleic anhydride grafled exclusively to the tertiary carbon, and no dimeric or oligomeric maleic anhydride grails were observed. This was true for melt and solution grafting. 

Figure 13.2 Possible modifications to the natural rubber backbone by (a) catalysis to hydrogenated natural rubber, (b) interacting with maleic anhydride, and grafting with (c) polyacrylate, (d) methyl methacrylic acid, and (e) poly(methyl methacrylate).

The Mooney viscosity value of the maleated natural rubbers/poly(methyl methacrylate) blends increased with an increased concentration of maleic anhydride used in the grafting copolymerization. The shear flow property of the... 

Nakason, C., Kaesaman, A., and Supasanthitikul, P. (2004). The grafting of maleic anhydride onto natural rubber. Polymer Testing 23( 1), 35-41. 

Maleic anhydride may be grafted to scrap vulcanized rubber to aid in reclaiming of natural rubber and GR-5 scraps.These materials have a higher Mooney viscosity, with less tendency to sag or flow on storage. Revulcanization can be achieved with different cure systems to give vulcanizates with improved oil resistance. 

Thermal degradation of PA-6/natural rubber blends with maleic anhydride (MA) showed that the DTG decomposition peak increased with an increase of rubber content 497853. Higher polyamide main-chain mobility was also expected due to the presence of the rubber particles. Although higher mobility was also expected to contribute to the increase of decomposition temperature, grafting rednced the intensity of degradation due to the reduction in chain mobility. MA-containing blends showed smaller DTG peaks at... 

Other compounds reacting similarly via activated double bonds (excluding here block or graft copolymerization) include maleic acid, A-methyl-maleimide, chloromaleic anhydride, fumaric acid, y-crotonolactone,/7-benzoquinone, and acrylonitrile. Other polymers with unsaturated backbones, such as polybutadiene, copolymers of butadiene with styrene and with acrylonitrile, and butyl rubber, react in similar ways, but the recorded reaction with poly(vinyl chloride) is largely mechanochemical in nature (discussed later). 

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