苯并噁嗪-氨基稀释剂改性硅炔杂化树脂及其复合材料性能  

Properties of silicone-acetylene resin modified with ethynyl benzoxazine-amino diluent and its composite

作　　者：束长朋 王茂源 周权[1] 宋宁[1] 倪礼忠[1] SHU Changpeng;WANG Maoyuan;ZHOU Quan;SONG Ning;NI Lizhong(Key Laboratory for Special Polymer Materials and Related Technology,School of Materials Science and Engineering,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[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

出　　处：《复合材料学报》2020年第11期2718-2725,共8页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(51573044)。

摘　　要：采用氨基稀释剂(AD)和端乙炔基型聚苯并噁嗪(EB)树脂改性一种具有高力学性能的聚(间二乙炔基苯-二甲基硅烷)(PDMP)树脂。按照质量比PDMP∶EB∶AD=5∶1∶1进行共混后制备PDMP-EB-AD树脂。利用FTIR、DSC、介电分析仪(DEA)、TGA分析改性前后树脂的结构、黏度、固化过程和耐热性能变化。结果表明,AD与EB中的-NH2和-C≡CH均参与进PDMP固化过程中,共混后PDMP-EB-AD树脂固化温度升高,黏度降低,热分解温度(Td5)在N2和空气下分别为539.5℃和518.7℃,1000℃质量保留率分别为85.1%和18.1%。利用浸渍法将PDMP-EB-AD树脂与石英纤维(QF)制备成预浸料进行模压成型,制备的QF增强PDMP-EB-AD树脂(QF/(PDMP-EB-AD))复合材料力学性能极大提高,且树脂与纤维的黏结性得到改善。常温下QF/(PDMP-EB-AD)复合材料弯曲强度和层间剪切强度(ILSS)分别为694.5 MPa和41.9 MPa,较QF/PDMP复合材料分别提高了176.6%和96.7%,250℃时弯曲强度和ILSS达到319.5 MPa和20.11 MPa。The poly(dimethylsilane-m-diacetylenyl phenyl)(PDMP)resin was modified by amino diluent(AD)and ethynyl benzoxazine(EB)resin.The modified blending PDMP-EB-AD resin was prepared according to PDMP∶EB∶AD mass ratio=5∶1∶1.The FTIR,DSC,dielectric analyzer(DEA),TGA were used to analyze the molecular structure,viscosity,curing process and heat resistance of the resin before and after modification.The test results show that-NH2 and-C≡CH in the AD and EB participate in the PDMP curing process.The curing temperature of the PDMP-EB-AD resin increases and the viscosity decreases.The thermal decomposition temperatures(Td5)of the PDMP-EB-AD resin at N2 and air are 539.5℃and 518.7℃,respectively.The mass retention rates of the PDMP-EB-AD resin at 1000℃are 85.1%and 18.1%,respectively.The quartz fiber(QF)/(PDMP-EB-AD)composites were prepared by PDMP-EB-AD resin and QF by impregnation and compression molding methods.The adhesion between resin and fiber and the mechanical properties greatly improve.The flexural strength and interlaminar shear strength(ILSS)of the QF/(PDMP-EB-AD)composites at room temperature are 694.5 MPa and 41.9 MPa,respectively,which are 176.6%and 96.7%higher than the QF/PDMP composite under the same conditions,the flexural strength and ILSS at 250℃are 319.5 MPa and 20.11 MPa,respectively.

关 键 词：硅炔杂化树脂 端乙炔基型苯并噁嗪 氨基稀释剂 热性能 力学性能 

分 类 号：TB332[一般工业技术—材料科学与工程] TQ322[化学工程—合成树脂塑料工业]