Alternating copolymerization of polar vinyl monomers in the presence of zinc chloride. III. NMR study of methyl methacrylate–styrene copolymer
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Abstract The copolymer composition curve of the methyl methacrylate–styrene copolymer obtained by the copolymerization in the presence of ZnCl 2 has more alternating tendency than that of ordinary methyl methacrylate–styrene copolymer obtained by radical copolymerization. The fine structure of the copolymer was examined by NMR, and the mechanism of the propagation step of the copolymerization in the presence of ZnCl 2 , which was proposed in the first report of this series, was verified.Poly(N-isopropylacrylamide)
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Abstract The monomer reactivity ratios for the copolymerizations of p-isopropylstyrene with styrene and with methyl methacrylate have been determined by the ionization chamber-vibrating reed electrometer radioactivity assay technique. The values from the differential form of the copolymerization equation are r1 (styrene) = 1.22, r2 (p-isopropylstyrene) = 0.89, and r1 (methyl methacrylate) = 0.44, r2 (p-isopropylstyrene) = 0.39. The values from the integrated form of the equation are r1 (styrene) = 1.37 and r2 = 0.99. These values indicate that, in the copolymerization of p-divinylbenzene (p-DVB) with styrene, the p-isopropylstyrene-like unit, formed from having the first vinyl group of p-DVB reacted, takes part in subsequent propagation reactions with styrene less readily than either styrene or p-DVB.
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For the first time,the graft natural rubber(NR) latex was produced by using 3-chloropropylene(AC)and methyl methacrylate(MMA).The effect of initiation systems,reaction temperature,reaction time,the ratio of MMA/AC,contents of initiator and NR latex concentration on the monomers conversion and monomers graft percent of graft polymerization had been studied.The results showed that the monomer conversion percent is lower with single AC,but the conversion increased largely with AC/MMA.The monomers conversion and the graft increased significantly with increasing the ratio of MMA/AC.The conversion and graft initiated by CHP/TEP is more than those initiated by KPS/TEP,KPS/FES,KPS/SHS.IR spectrum proved that the monomers AC and MMA had been really grafted onto NR.
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The copolymer had been synthesized by using N-tert-octylacrylamide/Acrylic acid/Methyl methacrylate/Butylaminoethyl Methacrylate/Hydroxypropyl Methacrylate as monomers.By adjusting monomers ratio,N-tert-octylacrylamide or methyl methacrylate,futher study the influence on the stiffness of the copolymer and the relationship beween monomers ratio and the stiffness.
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Abstract The photochemical copolymerization of styrene with methyl methacrylate were investigated under various conditions. The reactivity ratio and the ϕ values were evaluated.
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