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本文测定了一系列不同热拉伸比的风干PAC纤维的热溶胀收缩率,发现有一个剧烈的熵收缩阶段,继之以一个缓慢收缩阶段,用一个大分子收缩模型,将熵收缩S′与实测的二色性取向因素相联系,发现(?)(取向角余弦的均方)与S′成线性相关。 假定缓慢收缩是由于解取向,用同一模型可以推导出一个方程式,用来计算cos~2α_m,(?)值和cos~2α_m值的接近,说明缓慢收缩是由于解取向的假设是有根据的。
In this paper, the thermal expansion and contraction rates of a series of air-dried PAC fibers with different thermal draw ratios were determined and found to have a violent phase of entropy contraction followed by a slow phase of contraction with a macromolecular shrinkage model. The entropy shrinkage S ’ The observed dichroic orientation factors are found to be linearly related to S ’(?) (Mean square of the orientation angle cosine). Assuming that slow contraction is due to solution orientation, an equation can be deduced from the same model to approximate the cos ~ 2α_m, (?) And cos ~ 2α_m values, indicating that slow shrinking is due to the assumption that solution orientation is valid.