制造具有特殊机械和热性能的轻质聚胺泡
Yue Tian1, Yinfu Luo1, Haichao Meng1
1The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute, Sichuan University, Chengdu, 610065, China.
Macromolecular rapid communications
|August 21, 2023
概括
使用聚氨盐 (PEAS) 开发了轻质聚胺泡 (PIF),以获得优越的热和机械性能. 这些先进的PIF表现出了对要求高的应用程序的优异的高温绝缘能力.
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
- 纳米技术纳米技术
背景情况:
- 轻质聚胺泡 (PIF) 对于高温应用至关重要.
- 现有的PIF经常面临热阻和机械强度的限制.
- 开发新型前体是提高PIF性能的关键.
研究的目的:
- 制造具有特殊耐热性和压缩性质的轻质聚胺泡 (PIF).
- 为了研究前体成分对泡膨胀和特性的影响.
- 探索这些PIF作为高温隔热材料的潜力.
主要方法:
- 4,4'-二氨基二化物 (DABA),4,4'-二氨基甲 (MDA) 和3,3',4,4'-二四碳酸二化物 (BTDA) 的共聚合,形成聚氨盐 (PEAS).
- 热处理PEAS前体以诱导发泡并形成PIF.
- 描述PIF属性,包括膨胀比,压力强度,模量,热降解,玻璃过渡温度和热导率.
主要成果:
- 成功合成了具有不同MDA/DABA比率的PEAS前体.
- 增加DABA含量增强了融粘度和改善了细胞扩张的气体结合,将扩张比率从633%提高到1133%.
- PIFM9D1 (120.8公斤m-3) 实现了0.59 MPa的压力强度和15.0 MPa的模量.
- PIF具有优异的热稳定性,降解温度>511 °C,玻璃过渡温度>292 °C.
- 测量PIF的导热率为<0.049 W m-1 K-1 .
结论:
- 在PEAS前体中添加DABA显著改善了发泡过程和由此产生的PIF特性.
- 制造的PIF具有轻质结构,高压力强度和卓越的耐热性的非凡组合.
- 这些PIF在航空航天,海洋和核应用中显示出对高温隔热的显著前景.
相关概念视频
01:08Molecular Weight of Step-Growth Polymers
2.2K
Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
2.2K
01:22Thermal Insulation in Masonry Walls
147
In hot, dry climates, the thermal mass of masonry walls can be beneficial, absorbing heat during the day and releasing it at night, thereby stabilizing indoor temperatures. However, in most other climates, additional insulation is necessary to enhance thermal resistance.
External insulation can be applied using an Exterior Insulation and Finish System (EIFS), which involves affixing panels of plastic foam to the wall and covering them with a polymeric stucco reinforced with glass fiber mesh....
External insulation can be applied using an Exterior Insulation and Finish System (EIFS), which involves affixing panels of plastic foam to the wall and covering them with a polymeric stucco reinforced with glass fiber mesh....
147