PP grafted maleic anhydride

Polar polypropylene waxes are produced by grafting of PP with maleic anhydride. 

PP/EVAl maleic anhydride grafted PP lamellar Lohfink, 1990... 

Stabilizing PP, as was a new rubber grafted maleic anhydride HAS system. Cyclic bridged amines are also effective co-synergists with HAS, as are lactones. °° The polymer matrix has been found to influence the excited state properties of UV absorbers, while novel effective adducts of HAS and 2-hydroxyphenylbenzotriazoles have been made. ... 

The addition of a polypropylene grafted maleic anhydride (PP-g-MA) compatibilizer into polypropylene-co-ethylene/polybutylene succinate blends and the subsequent irradiation allowed prevention of degradation mechanisms leading to mechanical stability. The cyclic anhydride group of the PP-g-MA first permitted compatibilizion of both polypropylene-co-ethylene and polybutylene succinate and a second action as an "energy sink."... 

The compatibilizer as such may be compatible with the clay surfaces and hence easily intercalates into the interlayer spacing of the clay platelets and separates the clay platelets, and with bulk polymer it leads to the formation of well-dispersed nanocomposites. The compatibilizer widely used for polypropylene (PP) is maleic anhydride grafted PP (PP-g-MA) [15-16], Other compatibilizers used are diethyl maleate (DEM-g-PP) and polyolefin elastomer grafted maleic anhydride (POE-g-MA),... 

The clay remains as microtactoids (dispersed in microlevels) when it is dispersed in PP without the assistance of compatibilizer. By adding maleic anhydride grafted PP (PP-g-MA) as compatibilizer, well dispersed clay platelets are observed in the PP matrix. When polyolefin elastomer grafted maleic anhydride (POE-g-MA) compatibilizer is used, even two-phase separation has been reported between PP and POE-g-PP [15]. This phase separation is not identified in TEM analysis and it confirms the compatibility of clay and POE-g-PP. POE-g-PP enters into interlayer spacing and facilitates the delamination of clay layers. 

Xu, W., Liand, G., Wang, W., Tang, S., He, R, and Pan, W.-P. 2003. Poly(propylene)-poly(propylene)-grafted maleic anhydride-organic montmoriUonite (PP-PP-g-MAH-Org-MMT) nanocomposites. II. Nonisothermal crystallization kinetics. 

PP-g-MA Polypropylene grafted maleic anhydride pph Parts per hundred PPO Polyphenylene oxide PPS Poly (p-phenylene sulfide)... 

Simultaneous influence of polypropylene-graft-maleic anhydride (MAPP) and silane-treated hemp fibers (HF) on morphology, thermal and mechanical properties of high-flow polypropylene (PP) modified with poly[styrene-b-(ethylene-co-butylene)-b-styrene] (SEBS) was studied. Thermal stability of HF was improved... 

In Chapter 3, the direct relationship between MFR and amount of grafted MFR is described as a consequence of the peroxide initiated reaction kinetics. The inference here is that one should seek the highest concentration of grafted maleic anhydride for maximum molecular weight for MA-g-PP. Hence, one can envision the inherent difficulty of attaining the desired balance of MFR and grafted MAH content. 

Ionic crosslinking of polypropylene can also contribute to better properties. PP with grafted maleic anhydride can be crosslinked by addition of zinc diacetate or sodium acetate. It is surprising that besides bivalent zinc monovalent sodium can also act as a crosslinking agent... 

Addition of maleic anhydride (MA) by simple physical mixing is also beneficial to the adhesion properties of PP. The threshold concentration in this case is rather high, being around 5 wt.%. It is more straightforward, however, to graft MA onto the PP chain via free radical initiation, e.g. either by thermal decomposition of peroxides or photo-chemically. The amount of grafted maleic anhydride is usually below... 

Radical functionalization of iPP with acrylic acid (AA) gives iPP-AA, which acts as a compatibilizer for PP/liquid crystal polyblend fibers and increases fiber crystallinity and interfacial adhesion. " The reaction of PP with maleic anhydride in xylene at elevated temperatures (120 °C) in the presence of benzoyl peroxide gives maleated iPP. Co-melting of this material with poly(e-caprolactone) (PCL) for 6 h at 120 °C gave a PP-g-PCL graft copolymer. Similar methods have been employed for the grafting of A-phenylmaleimide and maleimido benzoic acid onto iPP oligomers in order to... 

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