文献类型：期刊文献

中文题名：含氰基和乙炔基苯并噁嗪树脂的固化行为及性能研究

英文题名：Curing behavior and properties of a benzoxazine resin containing cyano and acetylene groups

作者：李泽宇[1];王志德[2];周权[1]

机构：[1]华东理工大学材料科学与工程学院特种功能高分子材料及相关技术教育部重点实验室,上海200237;[2]北京航空材料研究院,北京100095

年份：2022

卷号：49

期号：3

起止页码：22

中文期刊名：北京化工大学学报（自然科学版）

外文期刊名：Journal of Beijing University of Chemical Technology(Natural Science Edition)

收录：CSTPCD;;Scopus;北大核心:【北大核心2020】；CSCD:【CSCD_E2021_2022】；

基金：中央高校基本科研业务费(50321042017001);国家自然科学基金(52173074)。

语种：中文

中文关键词：乙炔基;氰基;苯并噁嗪树脂;固化行为;耐热性

外文关键词：ethynyl;cyano;benzoxazine resin;curing behavior;heat resistance

摘要：以4-氨基苯氧邻苯二甲腈(BZN)、间氨基苯乙炔(APA)和多聚甲醛为原料制备了含氰基和乙炔基的苯并噁嗪树脂(BZ-BPA)。利用差示扫描量热法(DSC)、傅里叶变换红外光谱法(FT-IR)、热重分析法(TGA)分析了BZ-BPA的固化行为,得到:BZ-BPA在固化反应过程中存在两个放热峰(225℃和274℃);在氮气氛围下,BZ-BPA固化物热失重5%的温度(T)为502.6℃,800℃时质量残留率为79.8%;在空气氛围下,T为506.0℃,800℃时质量残留率为29.6%。采用Kissinger法计算得到两个固化反应的表观活化能(E):E_(1)=228.31 kJ/mol,E_(2)=87.97 kJ/mol;由Ozawa法计算得到:E_(1)=225.98 kJ/mol,E_(2)=92.26 kJ/mol;固化反应接近一级反应。考察了石英纤维增强的BZ-BPA复合材料(QF/BZ-BPA)的力学性能和耐热性能,结果显示:QF/BZ-BPA的玻璃化转变温度(T)为476℃;在常温下其弯曲强度为764.2 MPa,层间剪切强度为57.3 MPa;在400℃热处理2 h后,其弯曲强度为614.5 MPa,层间剪切强度为38.1 MPa;400℃热处理10 h后,其质量损失仅为2.4%。以上结果表明BZ-BPA复合材料具有优异的力学性能和耐热性能。
A cyano-and ethynyl-containing benzoxazine resin(BZ-BPA)has been prepared from 4-aminophenoxyphthalonitrile(BZN),m-aminophenylacetylene(APA)and paraformaldehyde.The curing behavior of BZ-BPA was analyzed by differential scanning calorimetry(DSC),Fourier transform infrared spectroscopy(FT-IR)and thermogravimetric analysis(TGA).There are two exothermic peaks(225℃and 274℃)in the curing process of BZ-BPA.The temperature of 5%thermal weight loss(T)of BZ-BPA cured in nitrogen is 502.6℃,and the residual mass rate at 800℃is 79.8%.Tin air is 506.0℃,and the residual mass rate at 800℃is 29.6%.The apparent activation energies of the two curing reactions were obtained by the Kissinger method:E_(1)=228.31 kJ/mol,and E_(2)=87.97 kJ/mol.The apparent activation energies were also obtained by the Ozawa method:E_(1)=225.98 kJ/mol,E_(2)=92.26 kJ/mol.The curing process is close to a first-order reaction.The mechanical and thermal properties of quartz fiber-reinforced BZ-BPA composites(QF/BZ-BPA)were investigated.The glass transition temperature(T)of QF/BZ-BPA is 476℃.At room temperature,the flexural strength is 764.2 MPa,and the interlaminar shear strength is 57.3 MPa.After heat treatment at 400℃for 2 h,the flexural strength was 614.5 MPa and the interlaminar shear strength was 38.1 MPa.After heat treatment at 400℃for 10 h,the mass loss was only 2.4%.The above results indicate that the BZ-BPA composites have excellent mechanical properties and heat resistance.