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Polymer Classification: Stereospecificity01:26

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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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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...
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用于固体推进剂的可光固化聚乙烯粘合剂的设计,合成和性能.

Minghao Zhang1, Min Xia1, Tao Guo1

  • 1School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, P. R. China.

Macromolecular rapid communications
|February 27, 2025
PubMed
概括

研究人员开发了两个可光固的结合剂,即基终结聚乙烯 (AUPET) 和烯酸终结聚乙烯 (PUA),用于增材制造固体推进剂. PUA提供快速固化,而AUPET提供增强的灵活性,添加醇.

关键词:
添加剂制造 添加剂制造 添加剂制造粘合剂 粘合剂 粘合剂乙烯氧化物-四基合聚乙烯.摄影固化是一种光学固化.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 聚合物化学 聚合物化学
  • 添加剂制造 添加剂制造 添加剂制造

背景情况:

  • 乙烯氧化物-四基共聚乙烯 (PET) 是固体推进剂中常见的粘合剂.
  • 光固化粘合剂对于先进的增材制造技术至关重要.

研究的目的:

  • 为了合成和描述基于PET的新型可光固化粘合剂,用于增材制造.
  • 评估合成的结合剂的光聚合动力学和机械性能.

主要方法:

  • 从PET合成基终结聚乙烯 (AUPET) 和烯酸终结聚乙烯 (PUA).
  • 研究光聚合的外热行为和动力学.
  • 在各种固化条件下测试机械性能 (抗拉强度,破裂时延长).

主要成果:

  • 与AUPET相比,PUA的光聚合率更快,使其能够快速光固化.
  • 在自固化过程中,PUA薄膜具有脆性 (1.18 MPa的抗拉强度,破裂时81.07%的延长).
  • 用醇固化AUPET的柔性显著增强 (0.37 MPa的抗拉强度,587.49%的破裂延伸).
  • 纳入三酸环和醇的存在改善了机械性能.

结论:

  • AUPET和PUA都是可行的可光固化结合剂,用于增材制造固体推进剂.
  • 粘合剂的选择取决于所需的特性:PUA用于速度,AUPET与醇用于灵活性.
  • 氨酸环结合提供了一条进一步提高粘合剂性能的途径.