Synthesis and Evaluation of Curing Agents
Annual technical rept. no. 1, 4 Mar 1968-28 Feb 1969
ESSO RESEARCH AND ENGINEERING CO LINDEN NJ GOVERNMENT RESEARCH LAB
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Curing agents for both carboxy and hydroxy- functional prepolymers have been investigated. Reactivity and specificity of these aziridines is also affected by the substitution on the aziridine ring. The 2,3- dimethyl aziridines exhibit the highest degree of specificity. To get satisfactory cures with the sulfonyl aziridines a catalyst is needed. Ureido and acyl 2,3- dimethyl aziridines give adequate cure rates at 150 degrees F. Mechanical properties of OH-Telagen-S gumstocks cured with di- triisocyanates have shown that the maximum stress, initial modulus and Shore hardness is a function of diisocyanate structure and triisocyanate level whereas the maximum strain is solely dependent on the triisocyanate level. Aging studies of OH-Telagen-S GUMSTOCKS CURED WITH DI-TRIISOCYLANATE HAVE SHOWN THAT THE URETHANE CURE LINKAGE HAS ADEQUATE THERMAL STABILITY AT 275 DEGREES F.
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