Abstract
Fracture surface energy ( FSE) measurements using a cleavage technique gave values of 42J/m 2 for the polyester, 80J/m 2 for the epoxide and 310J/m 2 for a rubber-modified epoxide with standard errors of 6J/m 2, 5J/m 2 and 10J/m 2 respectively. A modified method of calculation was introduced to accommodate the considerable within-sample variability of FSE of some samples. The effect of water on unmodified thermosets tested was examined and found to be relatively small.
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