Chemische Konstitution und pharmakologische Wirkung der Laxantien unter besonderer Berücksichtigung von Verbindungen mit zwei p‐Oxyphenyl‐Gruppen an einem gemeinsamen Kohlenstoffatom. 2. Mitteilung

SynopsisA polymer having high aromaticity andor cyclic ring structures in the chain backbone usually gives high heat resistance and flame resistance. Five glycidyl ether-type epoxy resins are prepared from bisphenol A (DGEBA), 9.9-bis(4-hydroxypheny1)fluorene (DGEBF), 3,6-dihydroxyspiro-[fluorene-9,9'-xanthane] (DGEFX), lO,lO-bis(4-hydroxyphenyl)anthrone (DGEA), and 9,9,10,10-tetrakk(4-hydroxyphenyl)anthracene (TGETA) in order to study structure-thermal stability-flame r e s i s p c e property relationships. In this study, trimethoxyboroxine (TMB) and diaminodiphenylsulfone (DDS) are employed as the curing agents. The char yield at 7 0 0 O C under a nitrogen atmosphere and the glass transition temperature (Tg) for the uncured resins decrease according to the sequence TCETA > DGEFX > DGEA > DGEBF > DGEBA. The Tg values for these cured epoxy resins are OCEBA < DGEBF < DGEFX < DGEA. A T, for the TGETA is not obtainable but would be expected to be the highest. The char yields a t 700°C of these cured epoxy resins have the same trend as the uncured resins. DGEBF, DGEFX, DGEA. and TGETA added to the DGEBA system show increases in the char yield, T,, and oxygen index with increasing concentration of these novel epoxy resins.

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Chemische Konstitution und pharmakologische Wirkung der Laxantien unter besonderer Berücksichtigung von Verbindungen mit zwei p‐Oxyphenyl‐Gruppen an einem gemeinsamen Kohlenstoffatom. 2. Mitteilung

Cited by 8 publications

References 9 publications

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