Abstract
Experimental values of the plane strain fracture toughness of cross-linked unsaturated polyester resins are presented. It is demonstrated that these values depend not only on nominal resin composition (e.g. nature of diol, or molar ratio, R, of unsaturated to saturated acid) but also on the conditions under which polycondensation occurs. It is necessary to define rather precisely the molar ratio of total diol to total acid, and also to assess the efficiency of diol utilization. These considerations become more important as R increases. Also, as the value of R increases, toughness falls. When samples are immersed in hot water, a reduction in toughness is found. The effect of crack-tip radius on apparent toughness values is more marked with a resin of low than of high cross-link density.
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