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Kinetic evaluation of reactivity of bisphenol A derivatives as radical scavengers for methacrylate polymerization

Paper ID Volume ID Publish Year Pages File Format Full-Text
13645 888 2000 6 PDF Available
Title
Kinetic evaluation of reactivity of bisphenol A derivatives as radical scavengers for methacrylate polymerization
Abstract

The reactivity of bisphenol A (BPA), diethylstilbestrol (DEST) 2,2′-biphenol (22′BP), 4,4′-biphenol (44′BP) and hydroquinone (HQ) as radical scavengers was examined in 2,2′-azobisisobutyronitrile (AIBN)- and benzoyl peroxide (BPO)-induced methyl methacrylate (MMA) polymerization with respect to kinetic considerations. The initial rate of polymerization (IRP) was found to decrease in the order: 44′BP>BPA, DEST>22′BP⪢HQ, while the stoichiometric factor (n) of free radicals trapped by phenolic moiety decreased in the order: 44′BP (2.3)>HQ (2.0)>BPA, DEST (1.8)⪢22′BP (0.8). It was found that BPA was a more highly efficient inhibitor than HQ and that HQ acts as a retarder at higher concentrations in the BPO system. The high activity of BPA indicated that BPA is probably oxidized by a radical interaction in the dental resin system.

Keywords
Bisphenol A; Inhibitory polymerization; Induction period; Initiator
First Page Preview
Kinetic evaluation of reactivity of bisphenol A derivatives as radical scavengers for methacrylate polymerization
Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 21, Issue 21, 1 November 2000, Pages 2125–2130
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering