Chemistry and Properties of Crosslinked Polymers by S. S. Labana (Auth.)

By S. S. Labana (Auth.)

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While many epoxy resins are only reactive toward certain types of hardeners, every epoxy resin tested was cured by some combination of an organometallic catalyst and a phenolic accelerator. The cured resins had excellent electrical properties at 25°C to at least 170°C. High heat distortion temperatures resulted after relatively short cure schedules. The polyether structure of the cured resins is expected to make these resins more stable to hydrolysis under high humidity than acid anhydride cured epoxy resins.

0 phr of aluminum acetylacetonate (A1AA) gelled after 4 hours at 160°C. 0 phr of bisphenol A decreased the gel time to 45 min. 0 phr of bisphenol A decreased it to 20 minutes (TABLE 4). 0 phr of the phenol-formaldehyde resin BRRE 5555 was used as an accelerator; the resin gelled to a clear hard solid after 15 minutes at 120°C. 0 phr of catechol was added. 0 Gel time @ 160 C, min. 0 20 45 7 (15 min. 0 pbw of titanium acetylacetonate (TiAA) did not gel after more than 2 hours at 160°C. 0 pbw of catechol gelled after 7 minutes at 160°C.

The samples were cured 5 hours at 150°C. 0 phr of the hardener (TABLE 9). 0 Cure: 5 hours @ 150 C Mils Deflection Temperature, I 131 125 137 136 126 5 152 121 158 156 152 10 (HDT) 164 162 167 166 164 A solution was made from 20 pbw of TOGT and 80 pbw of BRZ 7541 by heating and stirring at 50-80°C. 5 pbw of this hardener were 170-172°C (TABLE 10). 6 and an epoxide equivalent weight of 175-182. 5 C u r e : 15 h r s . @ 160°C Mils Deflection 1 5 10 (HDT) Temperature, C 136 159 170 142 162 172 137 160 171 CONTROLLABLE REACTIVITY EPOXY HARDENERS 57 Aluminum acetylacetonate and catechol were used to cure ERL 4221.

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