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Types of Step-Growth Polymers: Polyesters01:20

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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the polymer...
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在中等温度下使用DMSO-DBN进行选择性弹性去除:从纯纤维到棉/聚混合物.

Tiago Azevedo1, Ana Catarina Silva1, Diego M Chaves1

  • 1Centre for Textile Science and Technology (2C2T), University of Minho, 4800-058 Guimarães, Portugal.

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概括

用催化剂的二甲基硫氧化物在织品混合物中有效降解弹性. 这种选择性去除有助于纤维对纤维的回收,改善材料质量,并使循环织制造成为可能.

关键词:
DBN催化剂的使用方法这就是DMSO.弹性的降解降解从纤维到纤维的回收利用.织废弃物 织废弃物的废弃物

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科学领域:

  • 织品化学 织品化学
  • 材料科学 材料科学 材料科学
  • 可持续制造 可持续制造 可持续制造

背景情况:

  • 选择性去除弹性纤维对于有效的纤维对纤维回收至关重要.
  • 弹的存在阻碍了机械回收过程,并限制了回收纤维的应用.

研究的目的:

  • 研究二甲基硫氧化物 (DMSO) 作为弹性降解溶剂.
  • 评估1,5-diazabicyclo[4.3.0]non-5-ene (DBN) 对弹性去除的催化作用.
  • 评估这种方法在织废物回收利用中的可行性.

主要方法:

  • 用DMSO在不同温度 (80-120°C) 和时间 (10-60分钟) 中处理弹性和织品混合物.
  • 使用DBN作为有机基催化剂 (0.1%v/v).
  • 使用扫描电子显微镜 (SEM),拉力测试和维度分析进行分析.

主要成果:

  • 仅DMSO就实现了部分弹性质量损失 (高达79%).
  • 在温和条件下,DMSO-DBN系统几乎可以完全完成弹性质量损失 (81-100%).
  • 经过处理的棉/乳和聚/乳混合物显示出显著的尺寸松和保存的纤维完整性.

结论:

  • DMSO-DBN系统提供了一种节能且可扩展的选择性弹性降解方法.
  • 这种方法支持纤维对纤维的回收利用,并推进织品的循环经济原则.
  • 该方法有效地去除弹性纤维,同时保持其他织纤维的质量.