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本文提出了一种热塑性型聚氨酯弹性体的网络结构模型,它是由氢键交联网、缠结网和微区-高分子链组网的网络结构组成。基于上述模型,把三种网中的单个链组作为独立的统计单元和形变单元,计算了三种网中四种单个链组的末端距分布函数,结果表明它们均不同于高斯分布。根据上述分布函数和大形变机理,分别计算了三种网和总网的弹性形变自由能。从而提出了热塑性型聚氨酯弹性体的大形变弹性分子理论。并推导出五种简单形变方式的应力-应变关系。该理论成功地把弹性状态方程同聚氨酯的组成通过三个分子结构参数C_1、C_2和C_3联系起来。
In this paper, a model of the network structure of a thermoplastic polyurethane elastomer is proposed, which is composed of a network of hydrogen-bonded crosslinked networks, entangled networks and microscopic-polymeric networked networks. Based on the above model, the terminal distance distribution function of four kinds of single chain groups in three kinds of nets is calculated by using a single chain group in the three nets as an independent statistical unit and a deformation unit. The results show that they are different from the Gaussian distribution. According to the above distribution function and large deformation mechanism, the elastic deformation free energy of the three kinds of net and the total net are respectively calculated. Therefore, a large deformation elastic molecular theory of thermoplastic polyurethane elastomer is proposed. And deduced five kinds of simple deformation of the stress-strain relationship. The theory successfully links the elastic equation of state with the composition of the polyurethane through three molecular structure parameters C_1, C_2 and C_3.