腰果酚醛胺固化环氧树脂泡沫塑料性能研究

以双酚A型环氧树脂(EP)为基体树脂、自制的腰果酚醛胺(PCT)为固化剂、正戊烷(N-PT)为发泡剂、吐温-80和二甲基硅油为稳泡剂室温发泡制备新型环氧树脂泡沫塑料。研究了PCT用量对发泡时间和泡沫性能的影响，通过扫描电子显微镜和热失重分析对泡沫塑料的微观形貌和热性能进行了表征。结果表明，随着PCT用量增加，发泡时间逐渐缩短；环氧树脂泡沫塑料的密度、压缩强度、吸水率和热导率均随PCT用量的增加呈现先减小后增大趋势；当PCT加入量为30 %(相对于纯EP)时，发泡时间降至5 min；泡沫塑料的综合性能较佳，密度为0.0467 g/cm^3、压缩强度为276 kPa、吸水率为2.9 %、热导率为0.037 W/m·K，此时泡孔大小均匀，不良泡孔少；泡沫初始失重温度为248.4 ℃，最大失重速率温度为362.3 ℃，耐热性最佳。

Properties of PCT Cured Epoxy Foam

A new epoxy foam was prepared from bisphenol A type epoxy resin(E-51)，PCT，n pentane (N-PT), and tween-80/silicone oil, and cured at room temperature. The effect of amount of PCT on the foaming time and properties of the foam was studied. When the loading of PCT was 30 % (based on epoxy), the foaming time was 5 min. The optimal formula of the new epoxy foamwas as follows (in parts): E-51100,PCT30, N-PT5, (tween-80/silicone oil)5. The optimum process was，PCT and tween-80/silicone oil were first mixed and stirred，then N-PT was added，stirred，poured，foamed and molded. Some properties of the foam were: density 0.0467 g/cm^3，bibulous rate 2.9 %，thermal conductivity 0.037 W/(m·K)，compressive strength 276 kPa，and initial weight loss temperature and the temperature at fastest weight loss rate were 248.4 ℃and 362.3 ℃，respectively.