用于隔热的疏水型/混合气凝:甲基修饰方法的影响
Mengcheng Nie1, Yong Kong1,2, Zhixin Wang1
1College of Materials Science and Engineering, Nanjing Tech University, Nanjing 211816, China.
Gels (Basel, Switzerland)
|January 27, 2026
概括
研究了制造疏水性/气凝的三种方法. 在现场聚合产生了优越的绝热,机械强度和耐候性,使其成为建筑绝热应用的理想选择.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术 纳米技术
- 化学工程是化学工程的重要组成部分.
背景情况:
- /混合气凝是有前途的隔热材料.
- 实现疏水性,机械强度和耐久性对于实际应用至关重要.
- 现有的合成方法在性能和稳定性方面存在局限性.
研究的目的:
- 用三种不同的甲基修饰方法合成疏水性/混合气凝.
- 研究和比较合成的气凝的疏水性,导热性,机械性质和耐候性.
- 阐明疏水性背后的机制以及甲基组连接对材料性能的影响.
主要方法:
- 通过现场聚合 (RA-IS),表面接种 (RA-SG) 和蒸气沉积 (RA-VD) 合成疏水性/混合气凝.
- 使用水接触角度测量对疏水性的表征.
- 评估热导率,特定表面积,纳米孔体积,散密度,压缩强度和模量.
- 在热,高热和紫外线老化条件下评估耐候性.
- 耐火性测试 耐火性测试 耐火性测试
主要成果:
- 所有方法都产生了与水接触角度约为140°的气凝,表明了良好的疏水性.
- 在现场聚合法 (RA-IS) 的结果是最高的特定表面积,纳米孔体积和最低的散装密度.
- 与RA-SG和RA-VD相比,RA-IS的导热率 (32.2 mW·m-1·K-1) 和压缩强度 (3.3 MPa) 和Young模量 (19.2 MPa) 显著降低,相对于RA-SG和RA-VD.
- 由于具有共价键的甲基组,RA-IS表现出极好的耐候性,而RA-SG和RA-VD表现出较差的耐候性.
- RA-IS在暴露于火焰下是不可燃的和稳定的.
结论:
- 在现场聚合是一种高效的方法,用于生产具有增强性能的先进的/混合气凝.
- 在矩阵内的甲基组的共价连接是实现卓越的疏水性,机械强度和耐候性的关键.
- 这些发现为开发用于建筑绝缘和其他苛刻应用的高性能气凝提供了宝贵的见解.
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