摘要
合成了一种含磺酸基的热固性Resol Novalak共聚酚醛树脂 (C—PF/SPF)。TG—MS(热失重—质谱 )的研究结果表明 ,C—PF/SPF在低于 35 0℃时 ,主要发生与磺酸基相关的热分解并逸出SO2 等产物 ;在4 5 0℃～ 82 0℃范围 ,只观察到CO2 (m/z =4 4 )、CO (m/z =2 8)和H2 O (m/z=18)等产物及其碎片 ;在 110℃～82 0℃的测试温度范围未检测到与主链断裂有关的酚类热解产物 ,显示出优越的热稳定性 ;这是由于部分磺酸基中的硫在热处理过程中与酚醛树脂的芳环发生交联 ,从而大大增加了C—PF/SPF的热稳定性。基于TG—MS结果的理论计算表明 ,C—PF/SPF经 35 0℃热处理后的理论残碳率可达 80 % 。
A kind of thermosetting phenolic resin is synthesized by copolymerization of Resol type phenolic prepolymer with sulfonated Novalak type phenolic prepolymer (C PF/SPF). TG MS analysis is carried out for C PF/SPF. When pyrolytic temperature is lower than 350℃, the C PF/SPF gives off SO 2 and H 2O mainly resulted from pendant sulfonic acid groups of the C PF/SPF. In the range of 450℃ to 820℃, only CO 2 ( m/z =44),CO (m/z =28),H 2O ( m/z =18) and their fragments are observed. In the whole observed range of 110℃ to 820℃, no pyrolytic products and fragments of phenols, which might be derived from cleavage of the C PF/SPF main chain, are detected, implying excellent thermal stability of the C PF/SPF. This improvement on thermal stability probably is the results of S linkages among phenolic aromatic rings during pyrolysis. Upon post treatment at 350℃, theoretical carbon yield of the C PF/SPF might reach 80%, showing an attractive possibility as a matrix precursor of C/C composites.
出处
《宇航材料工艺》
CAS
CSCD
北大核心
2003年第1期24-28,共5页
Aerospace Materials & Technology
