新型含硅聚三唑树脂及其复合材料的制备与性能

PREPARETION AND PROPERTIES OF A NEW SILICON-POLYTRIAZOLE RESIN AND ITS COMPOSITE

通过格式试剂法合成了低分子量的含硅芳炔(LPSA),并以LPSA和二叠氮(A2)为原料制备出加工性能较好的新型含硅聚三唑树脂(Si-PTA树脂),采用模压方法制备了单向T700碳纤维/Si-PTA树脂复合材料。用FT-IR、流变、DSC、DMA、TGA等分析测试方法表征了Si-PTA树脂及其固化物的结构与性能,研究了炔基和叠氮基团配比对树脂热性能的影响,测定了复合材料的力学性能。结果表明,Si-PTA树脂可以在80℃下固化,固化后树脂的玻璃化温度(Tg)能达到310℃,在氮气气氛中的5%热失重温度(Td5)在340℃以上。单向T700碳纤维/Si-PTA树脂复合材料常温下弯曲强度为1622MPa,弯曲模量为132GPa,层间剪切强度为58.2MPa,200℃下弯曲强度保留率为70.8%。

Low molecular weight silicon-containing arylacetylene（ LPSA） was designed and synthesized from diethynylbenzene and dimethyldichlorosilane. A new silicon-polytriazole（ Si-PTA） resin was synthesized from 4,4＇-diazidomethyl biphenyl（ DAMBP） and LPSA via 1,3-dipolar cycloaddition. The results show that the resin could be cured at 80℃. The dynamic thermomechanical analysis（ DMA） results show that the glass transition temperature（ Tg） of the cured Si-PTA resin is 310℃. Thermogravimetric analysis（ TGA） results show that the thermal decomposition temperature（ Td5,temperature at 5% weight loss） under N2 could reach 340℃. Unidirectional T700 carbon fiber reinforced Si-PTA composite（ Si-PTA / T700） was prepared through compression molding. The structures and properties of the composite were characterized by mechanical property tests and DMA. The results show that the Si-PTA composite exhibited good mechanical and thermal properties.