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The formation and structure of suspension‐polymerized styrene–divinylbenzene copolymers
Author(s) -
Howard G. J.,
Midgley C. A.
Publication year - 1981
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1981.070261131
Subject(s) - divinylbenzene , copolymer , suspension polymerization , porosimetry , materials science , sorption , styrene , polymer , polymer chemistry , polymerization , desorption , chemical engineering , porosity , solvent , suspension (topology) , porous medium , adsorption , chemistry , organic chemistry , composite material , mathematics , homotopy , pure mathematics , engineering
Porous polymers were prepared by suspension copolymerization of styrene/divinylbenzene in various ratios together with various quantities of diluents, both solvating and nonsolvating. Parallel bulk polymerizations were made to detect the onset of gelation and phase separation. The dry polymeric beads were examined by a range of techniques: apparent densities; mercury porosimetry; nitrogen sorption/desorption isotherms, vapor sorption, equilibrium swelling, and electron microscopy. The properties of the porous polymers are discussed in terms of phase separation during polymerization consequent on either an unfavorable polymer–solvent interaction or a microsyneresis.