Vinyl polymerization. VI. Dilute solution properties of 1:1 Poly (styrene-co-ethylmethacrylate)

Karunakaran, K. ; Santappa, M. (1968) Vinyl polymerization. VI. Dilute solution properties of 1:1 Poly (styrene-co-ethylmethacrylate) Proceedings of the Indian Academy of Sciences, Section A, 67 (4). pp. 175-183. ISSN 0370-0089

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1:1 Poly (styrene-co-ethylmethacrylate) (PSEM) was prepared by bulk polymerization and fractionated using methylethyl ketone/petroleum ether system. IR and NMR analyses of the copolymer substantiated the composition kinetically expected. As the composition heterogeneity of the compolymer was narrow, the characterization of the copolymer was effected in a single solvent by light scattering as well as viscosity measurements at 35°C. The molecular weight dependence of [η], the limiting viscosity number; (r̅2)w½, therms end to end distance and A2 the second virial coefficient were established. The solvent ethylacetate was found to be thermodynamically more ideal for PSEM, than for polyethylmethacrylate. In an attempt to evaluate K, the Flory's constant, application of various methods appeared to give almost similar values. In order to explain the low value of φ, the Flory's universal parameter, rough estimates of (r̅20)½, the unperturbedrms end to end distance; b, the statistical chain element;q, the persistence length and r̅20/lr̅max, the semiflexibility parameter were also made.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
ID Code:43386
Deposited On:11 Jun 2011 09:54
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