Abstract
A new synthesis of thermoset antifouling polymer systems Ms achieved by the crosslinking reaction of cycloaliphatic epoxides with the free carboxyl groups present on a base polymer partially esterified with tributyltin oxide. The network structure was varied, and the average separation, length and type of epoxy crosslinks were altered by changing the degree of esterification of the base polymer, the structure and proportion of epoxy monomer, and the type of catalyst. Concurrent changes in measured strength, fracture toughness and dynamic mechanical behavior of the polymer systems have been correlated with the structural variables employed. Results presented here pertain mainly to systems based on styrenemaleic anhydride copolymer crosslinked by cycloaliphatic epoxides. Toughening by carboxyl terminated liquid elastomers has also been studied and the improvement in fracture toughness related to the average particle size of the dispersed elastomer phase which was in turn controlled by elastomer content, A:E ratio, and tributyltin content. The formation of domains in the matrix with independent glass transitions was followed by observing variations in loss moduli which also reflected the structural effects of bulky tributyltin groups and different epoxy monomers. The highest degrees of cross-linking were found with uranyl nitrate catalyst.
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