Kashyap, AK and Kalpagam, V (1981) Dilute Solution Properties of Methyl Methacrylate/Acrylonitrile Random Copolymers, 2a). In: Makromolekulare Chemie-Macromolecular Chemistry And Physics, 182 (4). 1147 -1152.
full_text_4.pdf - Published Version
Restricted to Registered users only
Download (261Kb) | Request a copy
The Stockmayer-Fixman relation was used to evaluate the short range and long range interaction parameters for methyl methacrylate/acrylonitrile copolymers of 0,566 and 0,657 mole fraction of monomeric units of acrylonitrile in the solvents acetonitrile, 2-butanone, dimethyl formamide, and y-butyrolactone, at different temperatures (30, 45, and 60 “C). The values of KO were found to be lower than those of the parent homopolymers, and their values depend on both solvent and temperature. Even negative Ko-values were obtained, in cases in which the Mark Houwink exponent a is nearly unity. The values of the polymer-solvent interaction parameter, x, , are high and close to 0,5, indicating that these solvents are not good. The values of the excess interaction parameter, xAB, are negative and are not affected by temperature. The large extension of these copolymer chains, as exhibited by a and a;-values, can be understood in terms of unusual short range interactions only. Similar results were obtained for some cellulose derivatives.
|Item Type:||Journal Article|
|Additional Information:||Copyright of this article belongs to Huthig & Wepf Verlag.|
|Department/Centre:||Division of Chemical Sciences > Inorganic & Physical Chemistry|
|Date Deposited:||12 Jan 2010 11:14|
|Last Modified:||19 Sep 2010 05:45|
Actions (login required)