超分支的甲基覆盖型聚氨:用于高性能环氧粘合剂的硬化固化剂
Peixin Niu1, Zhiying Zhao1, Yifang Zhao1
1College of Chemistry and Pingyuan Laboratory, Zhengzhou Key Laboratory of Elastic Sealing Materials, Zhengzhou University, Zhengzhou 450001, China.
Langmuir : the ACS journal of surfaces and colloids
|March 21, 2025
概括
研究人员开发了新的聚氨固化剂,以加固易碎的环氧树脂. 这提高了环氧的质量.
科学领域:
- 聚合物科学 聚合物科学
- 材料科学 材料科学 材料科学
背景情况:
- 热固化环氧树脂提供了卓越的性能,但由于其固有的脆性,限制了它们在高精度应用中的使用.
- 环氧树脂的高交联密度有助于它们的脆性,阻碍了先进材料的开发.
研究的目的:
- 设计和合成新型的醇终结分枝聚氨作为环氧树脂的固化剂.
- 通过定制的聚氨固化剂来增强环氧树脂的机械性能,特别是性和粘附性.
- 为了克服与传统硬化剂相关的兼容性和分散性挑战.
主要方法:
- 合成有控制分子重量的醇终结分枝聚氨.
- 利用这些聚氨作为环氧树脂的固化剂.
- 固化环氧粘合剂的机械性能 (切强度,抗拉强度,折裂性) 和耐溶剂性能的表征.
主要成果:
- 开发的聚氨固化环氧粘合剂实现了27MPa的围切割强度,47MPa的拉伸强度和4.1MPa的断裂性.
- 新的环氧系统表现出广泛的基板兼容性和出色的耐溶剂性.
- 与传统的环氧固化剂和商业的聚硫化固化剂相比,观察到更好的机械性能.
结论:
- 定制聚氨固化剂的分子量和交联密度有效地提高了环氧树脂的性和粘附性.
- 这种方法提供了一种兼容且有效的方法,可以在没有单独的添加剂的情况下使环氧树脂变硬.
- 由此产生的聚氨固化环氧具有卓越的性能,使其适用于先进的应用.
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