The accclerating effect of zinc chloride on the copolymerization of ethyl acrylate with styrene initiated by AIBN in benzene was investigated. The order of reaction with respect to monomer and ZnC1, concentration is determined. The energy of activation of the copolymerization in presence and absence of ZnC1, is calculated.
EinfluP von Zinkchlorid auf die Kinetik der Copolymerisation von Ethylacrylat und StyrenDic besclileunigende Wirkung von Zinkchlorid auf die Copolymerisation von Ethylacrylat und Styren bei Initiierung mit AIBN in Benzen wurde untersucht. Die auf die Konzentration der Monomere und des ZnC1, bezogene Reaktionsordnung wurde bestimmt. Die Aktivierungsenergie der Copolymerisation mit und ohne ZnC1, wurde berechnet.
The kinetic investigation of the radical copolymerization of methylacrylate(MA) with styrene(Sty) usingzincchloride(ZnC1,)asan accelerator wascarried out at 60 0.1"C for 120 min. The rate of polymerization was proportional to the concentrations of ZnCI, and monomers. The energies of activation in the presence and absence of the complex are 34 and 89 kJ mol-I, respectively.
Radical copolymerization of acrylonitrile (AN) with styrene (Sty), using %,a'-azobisisobutyronitrile as initiator, was carried out in the presence of zinc chloride (ZnCI,) dilatometrically at 65 *O.l"C for 120min. The rate of polymerization was a direct function of the concentrations of ZnCI,, AN and Sty, and polymerization temperature. The viscosity-average molecular weight of the copolymer increased with ZnCI, concentration. The energy of activation in the presence and absence of the complex was evaluated as 82.5 kJ m o l~ and 11 5.5 kJ mol-', respectively. The copolymerization of AN with Sty proceeded via the radical-complex mechanism.
The complexes of methyl acrylate (MA), ethyl acrylate (EA) and n‐butyl acrylate (BA) with zinc chloride (ZnCl2) were prepared at 300 K and found to be polar in nature. The viscosity and density of the complexes increased while the tendency to form a binary complex decreased with increase in size of the alkyl substituents of the acrylate monomers. The copolymerization of MA and BA with styrene (Sty) followed a cross‐propagation mechanism, whereas the copolymerization of EA with Sty followed a radical‐complex mechanism in the presence of their complexes with ZnCl2.
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