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Title: Effect of network structure on thermal and mechanical properties of cured epoxy resin containing mesogenic group

Epoxy resin containing biphenol group as a mesogenic group was cured with phenol (PN) and catechol (CN) novolacs. In the CN-cured biphenol type epoxy resin, the glass-rubber transition, almost disappeared and thus the very high elastic modulus was obtained in the high temperature region. It is clear that the micro-Brownian motion of the network chains is highly suppressed in this cured system. On the other hand, the PN-cured resin showed the well-defined glass-rubber transition and thus the low rubbery modulus. In addition, in the former system, the characteristic pattern like a schlieren texture was clearly observed in the polarized optical microphotographs. This shows that the mesogenic group contained in the epoxy molecule is oriented in the system cued with catechol novolac, which has neighboring active hydrogens. The computer simulation based on the molecular mechanics also showed that the orientation of the network chains should occur in the CN-cured biphenol epoxy system. Thus, we conclude that the suppression of the micro-Brownian motion in the CN-cured system is due to the orientation of network chains containing a mesogenic group. Moreover, it has been shown that die mechanical and bonding strength at high temperature is considerably improved by the suppression of the networkmore » chain in the CN-cured biphenol resin system.« less
Authors:
; ;  [1]
  1. Kansai Univ., Osaka (Japan) [and others
Publication Date:
OSTI Identifier:
370900
Report Number(s):
CONF-960376-
TRN: 96:003805-0962
Resource Type:
Conference
Resource Relation:
Conference: Spring national meeting of the American Chemical Society (ACS), New Orleans, LA (United States), 24-28 Mar 1996; Other Information: PBD: 1996; Related Information: Is Part Of 211th ACS national meeting; PB: 2284 p.
Publisher:
American Chemical Society, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; EPOXIDES; MECHANICAL PROPERTIES; RESINS; PHENOL; TEXTURE; CURING; BROWNIAN MOVEMENT