苯并（口恶）嗪树脂烧蚀性能的初步研究

对苯并（口恶）嗪树脂作为烧蚀树脂的应用进行了研究.采用TGA对四种中间体固化树脂的成碳率进行了测量,表明含有多个NFDA9嗪环的PBOZ中间体和含有两嗪环的MDABOZ固化树脂和DRBOZ固化树脂成碳率较高,达到60%以上,而含有一个嗪环的SRBOZ固化树脂的成碳率相对较低.在以SRBOZ 中间体为主体的树脂体系中引入MDABOZ中间体、DRBOZ中间体和APPFBOZ中间体后树脂体系的粘度较低而其固化产物的交联密度明显提高,成碳率达到60%以上.小发动机烧蚀试验表明PBOZ固化树脂的耐烧蚀性能较好,能够作为烧蚀树脂;SRBOZ 中间体中引入MDABOZ中间体后树脂体系的粘度较小而其固化产物的耐烧蚀性能明显提高.

Primary Investigation on Ablative Properties of Benzoxazine Resins

Applications of benzoxazines as ablative resins were studied in this paper.Char yields of four kinds of cured benzoxazine precursors were measured by TGA and the data showed that the char yields of multi benzoxazine PBOZ precursors and di benzoxazine MDABOZ, DRBOZ precursors were higher than 60%, but that of mono benzoxazine SRBOZ precursors was relatively low. By introducing MDABOZ , DRBOZ and APPFBOZ precursors into SRBOZ resin system ,resultant char yield was remarkably raised over 60%,and viscosity of the resin systems was still low. Small generator ablation tests indicated that cured PBOZ precursors exhibited good ablation resistance and cured SRBOZ resin system modified by di benzoxazine MDABOZ precursors,with low viscosity,was upgraded substantially in its ablation resistance.