Lei Wenwu, Wang Dengyu, Liu Qi, Li Kui, Li Ying, Zhong Fei, Liu Qiancheng, Wang Pan, Feng Wei, Yang Xulin
School of Mechanical Engineering, Chengdu University, Chengdu 610106, China.
Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province, China West Normal University, Nanchong 637009, China.
Polymers (Basel). 2022 Dec 10;14(24):5410. doi: 10.3390/polym14245410.
It is essentially important to develop durable polymer foams for services in high-temperature conditions. The current study reported the preparations and properties of a high-performance benzoxazine-phthalonitrile (BZPN) foam by utilizing azodicarbonamide and tween-80 as the blowing agent and stabilizer, respectively. Rheological and curing studies indicated that the appropriate foaming temperature for BZPN foam is below 180 °C, and its foaming viscosity window is below 20 Pa·s. Guided by these results, uniform millet bread-like BZPN foams with decimeter leveling size were successfully realized, suggesting the high prospect of large-scale production. The structural, mechanical, and thermal properties of BZPN foams were then investigated in detail. BZPN foam involves a hierarchical fracture mechanism during the compressive test, and it shows a high compression strength of over 6 MPa. During a burning test over 380 °C, no visible smoke, softening, or droplet phenomena appeared and the macroscopic structure of BZPN foam was well maintained. Mechanically robust, flame-retardant, and uniform large-size BZPN foam are promising light durable materials with high service temperatures, i.e., as filling materials even in a very narrow pipette.
开发适用于高温条件的耐用聚合物泡沫至关重要。当前的研究报告了一种高性能苯并恶嗪-邻苯二甲腈（BZPN）泡沫的制备方法及性能，该方法分别使用偶氮二甲酰胺和吐温-80作为发泡剂和稳定剂。流变学和固化研究表明，BZPN泡沫的合适发泡温度低于180°C，其发泡粘度窗口低于20 Pa·s。基于这些结果，成功制备出了具有分米级平整尺寸的均匀小米面包状BZPN泡沫，这表明其具有大规模生产的广阔前景。随后详细研究了BZPN泡沫的结构、力学和热性能。BZPN泡沫在压缩试验中涉及分层断裂机制，其压缩强度超过6 MPa。在380°C以上的燃烧试验中，未出现可见烟雾、软化或滴落现象，BZPN泡沫的宏观结构得到了很好的保持。机械性能强大、阻燃且尺寸均匀的大型BZPN泡沫是有前景的轻质耐用材料，适用于高温环境，例如即使在非常狭窄的移液管中作为填充材料。
