期刊
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
卷 43, 期 15, 页码 1944-1949出版社
WILEY
DOI: 10.1002/polb.20486
关键词
gelation point; semi-interpenetrating networks (semi-IPNs); viscoelastic measurements
We report on the determination of the gelation point of semi-interpenetrating polymer networks (semi-IPNs) composed of poly(vinyl alcohol) (PVA) and poly(acrylic acid) (PAAc) formed by a sequential method. The evolution of the viscoelasticity during the gelation reaction of acrylic acid (AAc) in solutions of PVA has been monitored through the sol-gel transition with dynamic mechanical experiments. The gelation time of the system increased with PVA concentration; however, the molecular structure of the gel, composed of swollen clusters, is rather independent of the presence of PVA. (c) 2005 Wiley Periodicals, Inc.
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