Differential Scanning Calorimetry Cure Studies of Tetra‐N‐glycidyldiaminodiphenylmethane Epoxy Resins. Part 1 ‐ Reaction with 4,4′‐Diaminodiphenylsulphone
作者:
John M. Barton,
期刊:
British Polymer Journal
(WILEY Available online 1986)
卷期:
Volume 18,
issue 1
页码: 37-43
ISSN:0007-1641
年代: 1986
DOI:10.1002/pi.4980180110
出版商: John Wiley&Sons, Ltd
关键词: differential scanning calorimetry;epoxy;cure;kinetics
数据来源: WILEY
摘要:
AbstractRates and extents of cure are determined using differential scanning calorimetry in the isothermal mode over the temperature range 170–220°C, and from d.s.c. scans at various heating rates. The isothermal data are consistent with an autocatalytic mechanism at conversions up to about 20–30%. Data from d.s.c. scans fit a simple kinetic model which indicates that the apparent activation energy (E) for cure increases with increasing conversion, consistent with an increasing degree of diffusion control. At low levels of conversion the isothermal and dynamic data both provide estimates forEof about 70 kJ mol−1. The heat of cure is about 105 kJ mol−1epoxide, and is constant over a wide range of amine concentration. This indicates that any parallel or competing processes which occur must have the same heat of
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