Solution properties of methyl methacrylate–acrylonitrile copolymers

Abstract

SYNOPSISCharacterization of methyl methacrylate-acrylonitrile copolymers is done through viscosity, swelling, and differential refractometric studies. Viscosities of the copolymers and homopolymers were determined at 30,40, and 5OoC. The activation parameters of viscous flow, voluminosity, and shape factor were also calculated. The average shape factor was observed to be 2.5 ? 0.005 for all copolymer systems. Viscosity molecular weights were calculated, and from intramolecular expansion factor (a), it was observed that copolymers are less flexible than are homopolymers. d n / dc values obtained from differential refractometry are in good agreement with those calculated theoretically. 0 1993 John Wiley & Sons, Inc.

Synthesis and characterization of styrene-acrylic ester copolymers

“…29 This indicates that the swelling of polymer chains is limited in these systems, and the critical solution temperatures are lower for these polymer solutions because of decreased thermo- dynamic affinity with increased temperature. 29 Moreover, as shown in Table V, it can be recognized that the intrinsic viscosities of all the copolymers having a linear pendant group increased with increasing chain length of the pendant group. However, in the case of homopolymers, the intrinsic viscosities decreased with an increase in chain length of the pendant group.…”

“…In addition to this, the chemical composition and constitution, the homogeneity, and the length of sequences of chemically identical monomer units also affect the [] value. 29 The well-known Frenkel-Eyring equation for viscous flow can be written as ϭ ͑Nh/V͒exp͑⌬G vis /RT͒ (11) where V is the molar volume of the solution. But the molar volume of a polymer solution is an enigma; hence, the molar volume of the solvent was used in the calculations because the densities of the polymer solution and of the solvent are generally the same.…”

Solution Properties of a Polymer-Nonionic Surfactant Mixed System

“…Recently, it has been used to determine the shape of protein molecules and some acrylate copolymers in solutions. [14] …”

Solution Properties of Water-Soluble “Smart” Poly(N-acryloyl-N′-ethyl piperazine-co-methyl methacrylate)

“…Similar behavior has been reported for copolymers of acrylonitrile and MMA also in DMF. The equivalent hydrodynamic volume V e of the polymers was calculated using the relative viscosity data by the method described by Narang and Garg [17]. This hydrodynamic volume is a measure of the size of a solvated polymer molecule at infinite dilution.…”