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本文系统研究了新型再生纤维素纤维NEWCELL(NEW)和普通粘胶法再生纤维素纤维RAYON(RAY)的动态粘弹性能 ,结果表明 ,在 - 15 0℃～ +35 0℃温度范围内 ,再生纤维素发生了复杂的松弛和转变 ,并对这些松弛峰的分子运动机理进行了探讨。这些松弛和转变表明再生纤维素的结构非常复杂 ,而产生这一复杂性的根本原因是纤维素中大量的复杂的氢键作用及其运动。从各转变的特征值来分析 ,NEW的超分子结构具有较高的有序性 ,分子间和分子内氢键作用较大 ,而RAY的正好相反 ,且在其晶区内次晶较多 ,缺陷较多 ,故宏观力学性能上的NEW的模量大大高于RAY的。本文从粘弹性角度对氢键进行了讨论 ,首次提出了氢键破碎区 ,同时首次发现了纤维素在更低温度下的γ松弛。
In this paper, the dynamic viscoelastic properties of NEWCELL (NEW) and RAYON (RAY), a new type of regenerated cellulose fiber, were studied systematically. The results showed that the regeneration of regenerated cellulose fiber at a temperature range of -15 0 ℃ ~ +35 0 ℃ Complex relaxation and transformation of cellulose occurred, and the molecular mechanism of these relaxation peaks was discussed. These relaxations and transitions indicate that the structure of regenerated cellulose is very complex, and the root cause of this complexity is the extensive and complex hydrogen bonding and its movement in cellulose. From the analysis of the eigenvalues of each transition, the supramolecular structure of NEW has a higher order, the intermolecular and intramolecular hydrogen bonding is more effective, while RAY is the opposite, Defects, so the macro mechanical properties of NEW modulus is much higher than the RAY. In this paper, the hydrogen bonding is discussed from the perspective of viscoelasticity. The hydrogen bond breaking zone is first proposed and the γ relaxation at a lower temperature of cellulose is first discovered.