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Differential thermal analysis using high frequency dielectric heating I. Theory and equipment
Author(s) -
Wald S. A.,
Winding C. C.
Publication year - 1971
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760110110
Subject(s) - materials science , curing (chemistry) , thermocouple , dielectric , elastomer , composite material , differential thermal analysis , thermal analysis , analytical chemistry (journal) , thermal , thermodynamics , chemistry , optics , optoelectronics , physics , chromatography , diffraction
A new analytical technique, differential thermal analysis using high frequency dielectric heating (DTA/HF), has been developed which senses the rate and extent of the enthalpy change accompanying curing. These two parameters relate simply and quantitatively to curing reaction kinetics. In DTA/HF cylindrical samples of uncured elastomers, 2‐in. in diam and about 1‐in. high, enclosed in glass rings and covered, are heated in a high frequency (86 mc) electrical field simultaneously with an identically‐shaped precured reference disc of the same elastomer. Both sample and reference are clamped securely between 3 × 5‐in. rectangular output electrodes. The sample is cured isometrically under pressure generated by thermal expansion. Temperatures at the core of the sample and reference are monitored continuously using ungrounded junction thermocouples with stainless steel probes; both sample temperature and temperature differences between sample and reference are recorded. To test the validity of DTA/HF it was first applied to the dicumyl peroxide (DCP) curing of several cis‐1,4‐polyisoprene calcium carbonate mixtures for which reaction mechanisms and reaction kinetic data are available.