Graft copolymers of methy methacrylate onto canna starch using manganic pyrophosphate as an initiator

Abstract

SYNOPSISIn this article, the graft copolymerization of methy methacrylate with canna-starch under the initiating of manganic pyrophosphate was investigated systemly. It was found that the percentage of grafting, grafting efficiency, and rate of grafting were all dependent, to some extent, on the concentration of the initiator, monomer and starch, as well as reaction time and temperature. The rate equation of graft copolymerization established from the experimental results was similar to the equation derived from the reaction mechanism. The graft copolymer was investigated with an infered spectroscope, scanning electron microscope, and x-diffraction methods.

Graft polymerization of methyl methacrylate onto polyvinyl alcohol using Ce4+ initiator

“…[11][12][13][14][15][16] This provides substantial evidence of grafting onto PVA. To separate the grafted side-chain polymer from the PVA backbone, the grafted copolymer was subjected to acid hydrolysis 17 in a 1 mol L Ϫ1 HCl solution at 105°C for 24 h. The IR spectrum of the dried product was found to be identical with that reported for PMMA, which unambiguously indicated the PVAg-PMMA formation.…”

“…It is evident from the figure that, with the increase in temperature, the GE increases, reaches a maximum at 45°C, and then decreases. The favorable effect of temperature on grafting 1,17 could be ascribed to (1) enhanced diffusion of the MMA and CAS molecules onto the PVA structure; (2) improving the swelling capability of PVA; (3) increase in mobility of monomer molecules and their collision with macroradicals; and (4) increased propagation of grafted PVA. The decrease in GE after a certain temperature (45°C) can be attributed to higher rate of termination of the growing chain.…”

“…Percentage grafting (PG), grafting efficiency (GE), and rate of grafting (R g ) 17 were used to evaluate the graft copolymerization.…”

Graft copolymerization of methyl acrylate onto sago starch using ceric ammonium nitrate as an initiator

“…4 The percentage of grafting (P g ) and grafting efficiency (G e ); rate of graft polymerization (R g ) were determined by the following formula 7 :…”

Graft copolymerization of starch-AN initiated by potassium permanganate

“…starch is a ideal polymer to be used as biodegradIn our early articles, we reported the graft copolymerization of starch and gelatin. 18,19 The present article will systematically study the graft ular weight was consequently calculated ac-EXPERIMENTAL cording to the Mark-Houwink equation, below: [Mn(VII)] was comparatively low, the reaction between initiator and starch to form radicals on the starch backbone was dominant, so more Determination of Percentage of Grafting and chance was offered to the monomers to graft if…”