Oligomer composition and content in regenerated PA6 fiber and its effect on properties,Journal of Applied Polymer Science

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Oligomer composition and content in regenerated PA6 fiber and its effect on properties
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2024-01-03 , DOI: 10.1002/app.55150
Yongjun Wang _{1,

2} , Yintao Guo ₁ , Shuimi Zhong ₁ , Qisong Lin ₂ , Feng Gao ₁ , Wenxing Chen _{1,

2} , Wangyang Lu _{1,

2}

Affiliation

The preparation process from waste fibers to regenerated fibers is an environmental significance work. In this work, liquid chromatography/time-of-flight mass spectrometry, advanced polymer chromatography/multi-angle laser-light-scattering/refractive index detector, and two-dimensional wide-angle X-ray diffractometry were employed to characterize the polycaprolactam(PA6) fibers above oligomers composition and content, molecular weight and distribution, crystallization and orientation, and analyzing the changes in mechanical properties. The total content of oligomers in physical and chemical regenerated PA6 fiber is 2.084 wt% and 1.812 wt%, individually, which is higher than that in waste PA6 fiber. And the oligomer content of C1–C4 (cyclic monomer, cyclic dimer, cyclic trimer, and cyclic tetramer) in the regenerated PA6 fiber is higher than that of waste PA6 fiber. The regenerated PA6 fiber sample contains more low-molecular-weight substances, making it easier to form crystal nuclei and crystallize. During the dyeing process of the regenerated PA6 fiber, the γ crystal transformed into α crystal. The tensile strength of physical and chemical regenerated PA6 fiber is lower than that of waste PA6 fiber. And after dyeing, the oligomers content of regenerated PA6 fiber is significantly decreased, especially in C1–C4 oligomer. However, the crystalliniy and orientation of regenerated PA6 fibers were improved, which also leads to the fracture strength increased by about 20% compared to undyed fibers.

中文翻译：

再生PA6纤维中低聚物组成、含量及其对性能的影响

从废弃纤维到再生纤维的制备过程是一项具有环保意义的工作。在这项工作中，采用了液相色谱/飞行时间质谱、先进的聚合物色谱/多角度激光光散射/示差折光检测器和二维广角X射线衍射仪来表征聚己内酰胺。 PA6)纤维对上述低聚物的组成和含量、分子量和分布、结晶和取向进行分析，并分析力学性能的变化。物理和化学再生PA6纤维中低聚物的总含量分别为2.084wt%和1.812wt%，高于废PA6纤维中的低聚物总含量。再生PA6纤维中C1-C4低聚物（环状单体、环状二聚体、环状三聚体、环状四聚体）含量高于废旧PA6纤维。再生PA6纤维样品中含有较多的低分子物质，更容易形成晶核并结晶。再生PA6纤维在染色过程中，γ晶体转变为α晶体。物理化学再生PA6纤维的拉伸强度低于废旧PA6纤维。并且染色后，再生PA6纤维的低聚物含量显着下降，尤其是C1-C4低聚物。然而，再生PA6纤维的结晶度和取向性得到改善，这也导致其断裂强度比未染色纤维提高了约20%。

更新日期：2024-01-03

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