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Tertiary aromatic amines as cure reaction promoters for unsaturated polyester resins. II. Low temperature studies
Author(s) -
Storey Robson F.,
Sudhakar Dantiki,
Hogue Melissa
Publication year - 1986
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.1986.070320514
Subject(s) - materials science , differential scanning calorimetry , polyester , glass transition , nuclear chemistry , polymer chemistry , polymer , chemistry , composite material , physics , thermodynamics
N,N ‐dimethyl‐ p ‐toludine (DMPT), N,N ‐dimethyl‐ m ‐toluidine (DMMT), and their isomeric blends, were compared to N,N ‐dimethylaniline (DMA) as cure reaction promoters for an unsaturated polyester resin using 1% benzoyl peroxide at 15°C and 10°C. The promoters showed the following order of efficiency (by weight) as indicated by decreased gel and cure times: DMPT > DMPT/DMMT blends > DMMT > DMA. Under these conditions the optimum promoter concentration was 0.3%. At this level or higher, 80/20 and 60/40 DMPT/DMMT blends (wt/wt) performed essentially equal to DMPT but superior to DMMT and DMA. Examination of cured samples using differential scanning calorimetry showed that resins cured with DMPT or isomeric blends of DMPT and DMMT with high DMPT contents displayed higher glass transition temperatures and greater degrees of cure than samples cured using DMMT or DMA.