graft copolymer


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graft copolymer

[¦graft kō′päl·ə·mər]
(organic chemistry)
Any high polymer composed of two or more different polymeric entities chemically united.
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Key statement: The present invention is directed to a pneumatic tire comprising a carcass and an innerliner in direct contact with the carcass, the innerliner comprising: a film comprising a blend of a polyamide, an [alpha]-olefin graft copolymer, and an ionomer; and an adhesive layer disposed between the film and the carcass, the adhesive layer comprising: a polymeric amine and a resorcinol-formaldehyde-latex (RFL) adhesive.
Before analysis, graft copolymer latex was diluted with deionized water before it was dropped on a 400-mesh copper TEM grid.
Sorption ability of finely dispersed graft copolymers of polyvinylpyrrolidone and polystyrene (PVP-gr-PS) is greater, compared to the graft copolymer of polyvinylpyrrolidone and polymethylmethacrylate (PVP-gr-PMMA).
The gel formed (graft copolymer) was collected, dried, pulverized, and sieved.
After completing the reaction, a small amount of graft copolymer was poured into Petri dish and dried the samples in oven at 40[degrees]C for 48 h.
A graft copolymer is a system comprised of a backbone material to which a second polymer is attached at intervals along the chain.
The material is an impact-modified graft copolymer with notched Izod impact strength of 2.7 ft-lb/in, while maintaining good strength (5220 psi tensile yield), stiffness (347,000 psi flex modulus), and chemical and fuel resistance.
Finally, it can be suggested that the synergetic effects caused by dilution of styrene with methanol or ethanol and the addition of acids can be used to reduce monomer consumption as well as processing doses in a way that would improve the economy of the grafting process and the mechanical properties of the graft copolymer.
Keywords: Chitosan, Chitosan methacrylate, Biodegradable polymers, Antimicrobial activity, Graft copolymer.
It is reported that due to using BPO, possible reactions as following can be occurred: (a) the chain-transfer reaction between the growing chains and the backbone, which forms active sites on the backbone; (b) the monomers add to active center on the backbone to give a graft copolymer; (c) the graft copolymer chain growing on the backbone in which termination of the process is likely to occur in one of the chain-transfer or combination reactions involving the growing chain radical on the backbone.