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Glass transition behavior of latex interpenetrating polymer networks based on methacrylic/acrylic pairs
Author(s) -
Sperling L. H.,
Chiu TaiWoo,
Thomas D. A.
Publication year - 1973
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.1973.070170811
Subject(s) - methacrylate , polymer , materials science , glass transition , methacrylic acid , monomer , polymer chemistry , homologous series , composite material , chemistry , organic chemistry
Interpenetrating polymer networks (IPN's) of poly(alkyl methacrylates) and poly(alkyl acrylates) have been synthesized in latex form. Dynamic mechanical spectroscopy studies on these materials revealed extraordinarily broad glass transition regions, illustrating the semicompatible nature of these materials. In a true synergistic effect, the value of tan δ remains high and nearly constant over a broad temperature range for select compositions, emphasizing their potential value in noise and vibration damping applications. Compositionally identical latex IPN pairs were prepared by slow and rapid addition of monomer. The mechanical behavior of the resulting materials was similar and can be explained in terms of the core‐shell model. A 50/50 isomeric homologous series of compositions was examined. After taking into account the relative difference between the glass transition temperatures of the methacrylic/acrylic pair, no substantial change in compatibility was noted throughout the series. Because the acrylic monomer II is roughly equally solvated by both the previously formed methacrylic polymer I and the nascent acrylic polymer II, extensive polymer I/polymer II mixing is encouraged, and sharp phase separation discouraged in these materials.