聚对苯二甲酸乙二醇酯/聚对苯二甲酸丙二醇酯并列自卷曲长丝的结构-性能演变,Journal of Applied Polymer Science

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聚对苯二甲酸乙二醇酯/聚对苯二甲酸丙二醇酯并列自卷曲长丝的结构-性能演变
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2023-11-30 , DOI: 10.1002/app.54905
Xuzhen Zhang _{1,

2} , Jingwen Nan ₁ , Wenjian Huang ₁ , Shunli Xiao ₃ , Xiuhua Wang _{1,

2} , Yanlin Sun ₃ , Jin Zhou ₁ , Wenxing Chen _{1,

2}

Affiliation

为了研究自卷曲双组分并排双组分长丝的微观结构和机械性能，本文重点系统研究了聚对苯二甲酸乙二醇酯（PET）/聚对苯二甲酸丙二醇酯（PTT）的结构-性能演变。）通过不同组分比例的熔融纺丝、拉伸和热处理制备的并排双组分长丝。该研究结合了形态分析、热分析、结晶和取向分析。讨论了横截面和卷曲形态、结晶和主要含有层状和微纤维晶体的微观结构的变化及其对机械和自卷曲性能的影响。随着牵伸比（DR）的增加，长丝的结晶度、声波取向因子、拉伸强度和卷曲恢复率也增加。结晶区的声波取向因子从 0.923 减小到 0.777，但非晶区的声波取向因子从 0.677 增加到 0.903。与 DR 的变化相比，加热温度对 PET/PTT 混合长丝的拉伸强度影响有限。然而，随着加热温度从 144°C 升高到 168°C，卷曲恢复率首先增加到 11.8，然后降低到 9.8。大多数这些行为归因于 PTT 和 PET 组分收缩应力比率的变化，源于混合长丝的微观结构演化，包括晶体生长、断裂、偏转和链沿轴向变形。作为总结，提出了一个解释性草图来阐明商业 PET/PTT 长丝的结构-性能关系。

"点击查看英文标题和摘要"

Structure–property evolution of poly(ethylene terephthalate)/poly(trimethylene terephthalate) side-by-side self-crimp filament

To investigate the microstructure and mechanical properties of self-crimping two-component side-by-side bicomponent filament, this paper focuses on systematically investigating the structure–property evolution of poly(ethylene terephthalate) (PET)/poly(trimethylene terephthalate) (PTT) side-by-side bicomponent filament prepared via melt spinning with various component ratios, drawing and heating treatment. The investigation was operated upon the combination of morphology analysis, thermal analysis, crystallization, and orientation analysis. The variation of cross section and curl-morphology, crystallization, and microstructures mainly containing lamellar and microfibrillar crystals as well as their effects on the mechanical and self-crimping properties were discussed. As the draft ratio (DR) increases, the crystallinity, sonic orientation factor, tensile strength, and crimp-recovery rate of the filaments were increased. The sonic orientation factor in the crystalline region decreases from 0.923 to 0.777 but increases from 0.677 to 0.903 in the amorphous region. In contrast to the variation of the DR, heating temperature has a limited effect on the tensile strength of the PET/PTT hybrid filaments. Crimp-recovery rate, however, first increases to 11.8 and then decreases to 9.8 with an increasing heating temperature from 144 to 168°C. Most of these behaviors have been attributed to changes in the ratio of contractile stress for both PTT and PET components, originating from microstructural evolution in hybrid filaments, including crystal growth, breakage, deflection, and deformation of chains along the axial direction. As a summary, an interpretive diagrammatic sketch has been proposed to clarify the structure–property relationships of the commercial PET/PTT filaments.

更新日期：2023-11-30

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