Abstract
The peak height and shape of a cooling curve obtained in a differential thermal analysis experiment is governed by the transient balance between heat gained as a result of release of the latent heat of fusion of the polymer and heat lost in consequence of the resulting temperature gradient between the polymer and the thermal sink surrounding it. If Δθ is the observed height of the thermogram above its baseline, then it can be shown that to a good approximation where β is proportional to the ratio of the heat of fusion and the specific heat of the polymer, and γ is a constant determined by the thermal conductivity and geometry of the sample and its container. The rate of crystallization, w̄(t), appearing in the integral is a sensitive function of both t and Δθ. A closed-form solution of this integral is not possible, but numerical results may be obtained by computer methods.
Published Version
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