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Isothermal shrinkage kinetics of PET

机译：PET的等温收缩动力学

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The isothermal shrinkage of PET fibre of high crystallinity and orientation could be divided into two different processes characterised by different relaxation times and the final shrinkage amount. The first process was faster and its main molecular mechanism was the disorientation of the extended tie molecules of chains in the non-crystalline region. The second process was resulted in the variation of the crystalline region. The relationship between l_n(τ_1/τ_s and (T-T_s) could be described satisfactorily by WLF equation where 375 K was taken as T_s and the l_n(1/ τ_2) and 1/T could be fitted by a linear equation, and its activation energy was 49 KJ/mol. The contribution of the first process to the isothermal shrinkage was the main one, especially in the high temperature region. The disorientation in the non-crystalline region during shrinkage was proved by the changes of orientation function of amorphous region (f_(am)) with shrinkage time at different temperatures. The orientation function of crystalline region kept almost unchanged during the thermal shrinkage process. The restructuring of the crystalline region included the rapid growth of the crystallites and the low-speed process of formation of new paracrystals and the reorganisation of crystals during the whole shrinkage process. The changes of crystalline region became fast with the temperature rising. The structure changes of the amorphous and crystalline region were interdependent. They proceeded and competed during the thermal shrinkage, and the disorientation of molecules was restrained once the crystallinity structure became more perfect.
机译：高结晶度和取向的PET纤维的等温收缩可以分为两个不同的过程，其特征在于不同的弛豫时间和最终的收缩量。第一个过程更快，其主要分子机制是非晶区链的延伸键分子的取向失调。第二过程导致晶体区域的变化。 l_n（τ_1/τ_s和（T-T_s））之间的关系可以通过WLF方程令人满意地描述，其中375 K作为T_s，l_n（1 /τ_2）和1 / T可以通过线性方程拟合，并且活化能为49 KJ / mol，第一个过程对等温收缩的贡献是主要的，尤其是在高温区域，收缩过程中非晶态区域的失取向由非晶态取向函数的变化证明。在不同温度下具有收缩时间的区域（f_（am））。在热收缩过程中晶体区域的取向函数几乎保持不变。晶体区域的重组包括晶体的快速生长和低速形成过程整个收缩过程中新的副晶体的形成和晶体的重组，随着温度的升高，晶体区域的变化变快，非晶态和c的结构改变结晶区相互依存。他们在热收缩过程中继续前进并竞争，一旦结晶结构变得更加完美，分子的定向就会受到抑制。

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