Solution properties of poly(butyl methacrylate-co-acrylonitrile)

Arulsamy, S. M. ; Santappa, M. (1977) Solution properties of poly(butyl methacrylate-co-acrylonitrile) Die Makromolekulare Chemie, 178 (8). pp. 2451-2459. ISSN 0025-116X

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Poly(buty1 methacrylate-co-acrylonitrile) of 1:1 molar composition has been prepared by bulk polymerization process using 2,2'-azoisobutyronitrile (AIBN) as the initiator and fractionated using ethyl methyl ketone and methanol as the solvent and the precipitant respectively. The identical value of the refractive index increments (dn/dc) of these fractions indicated their homogeneity in chemical composition. The dilute solution properties of these fractions in N,N-dimethylformamide (DMF), ethyl methyl ketone (MEK), and acetone have been investigated employing light-scattering, osmometry and viscometry techniques. The following Mark-Houwink relationships have been established at 25°C: DMF:[η]=1,538·10 hypehn;2·M̅W0.73 MEK:[η]=7,096·10 hyphen;2·M̅W0.56 Acetone:[η]=7,852·10 hyphen;2·M̅W0.72. The unperturbed dimensions for the copolymer have been evaluated and compared with those for the constituting homopolymers. A solvent dependence of the unperturbed dimension has been observed. The steric factor, σ, was found to be 2,64 in DMF and 2,48 in MEK for poly(buty1 methacrylate-co-acrylonitrile) compared to a value of 2,20 for poly(acrylonitri1e) in DMF, and 2,09 for poly(buty1 methacrylate) in MEK which suggests the greater stiffness of the copolymeric chain compared to the constituting homopol ymers.

Item Type:Article
Source:Copyright of this article belongs to Huthig & Wepf Verlag, Basel.
ID Code:43344
Deposited On:11 Jun 2011 08:29
Last Modified:11 Jun 2011 08:31

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