Thermal properties of rigid rod epoxies cured with diaminodiphenylsulfone and dicyandiamide
Resource
Thermochimica Acta 392-393C: 391-394
Journal
Thermochimica Acta
Journal Volume
392
Journal Issue
393
Pages
391-394
Date Issued
2002
Author(s)
Abstract
The differences of thermal properties between rigid rod and flexible bisphenol A (DGEBA) epoxies were studied using modulated differential scanning calorimeter (MDSC), thermal gravimetric analyzer (TGA) and dynamic mechanical analyzer (DMA) techniques. The rigid rod epoxies of azomethine (AM), biphenol (BP) and tetramethyl biphenol (TMBP) were cured with diaminodiphenylsulfone (DDS) and dicyandiamide (Dicy), respectively. The DDS-cured epoxies have higher glass transition temperature (Tg) and decomposition temperature than the Dicy-cured epoxies due to the high functionality and rigid structure of DDS. The AM, BP and TMBP have higher Tg than DGEBA due to the rigid rod structure. The bulky methyl substitution on the BP main chain of TMBP epoxy decreases the order of polymer packing and reduces the Tg. The AM epoxy has the longest rigid rod structure, thus the AM epoxy has a higher Tg than that of BP and TMBP epoxies. © 2002 Elsevier Science B.V. All rights reserved.
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Type
journal article
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