Abstract
The anisotropic character of the creep behaviour of polycarbonate, oriented at a temperature 12°C above the glass transition to different draw ratios, has been studied using the model of Boyd and Jansson. This model is based on molecular assumptions and results in a second-order relation, ε = D1σ + D2σ2, where D1 is the linear and D2 the non-linear compliance component. The segmental orientation was determined by infra-red dichroism and the chain extension by shrinkage. It was found that both the linear and non-linear compliance components decreased with increasing orientation, although the non-linear component is affected much more by the orientation. The same result was found both in tension and contraction.
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