硼酸对硼硅氧烷树脂性能的影响  

Effect of Boric Acid on the Properies of Polyborosiloxane Resin

作　　者：宋金梅[1,2] 王雷[2] 张力[2] 王稳[2] 姚亚琳[2] 涂晨辰 SONG Jinmei;WANG Lei;ZHANG Li;WANG Wen;YAO Yalin;TU Chenchen(State Key Laboratory of Advanced Fiber Composites,Beijing Composite Material Co.,LTD,Beijing 102101;Resin Department,Beijing Composite Material Co.,LTD,Beijing 102101)

机构地区：[1]特种纤维复合材料国家重点实验室,北京玻钢院复合材料有限公司,北京102101 [2]树脂事业部,北京玻钢院复合材料有限公司,北京102101

出　　处：《材料导报》2017年第A01期338-341,359,共5页Materials Reports

基　　金：中材科技特种纤维复合材料国家重点实验室应用基础性研究项目(YJ2015SYS05)

摘　　要：用二甲基二氯硅烷与硼酸在低温下进行缩合反应制得硼硅氧烷树脂,采用GPC、FTIR、EDS、TG和DSC等方法对树脂的结构、分子量和热性能进行表征。通过对固化后树脂在空气气氛下进行不同阶段的氧化,然后对氧化物进行红外表征,结合其热失重曲线,分析了不同失重阶段的反应特性,同时推断出硼硅氧烷树脂的热氧化机理。研究结果表明,过量硼酸影响树脂的分子量和凝胶时间,使热氧化过程中B-O-Si含量不断增加,但温度超过600℃硼硅氧键发生断裂,形成氧化硅和氧化硼,且有少量碳化硼等物质生成,从而有效提高了树脂的耐热性和抗氧化性。A polyborosiloxane was synthesized using sodium tetraborate and bifunctional silane,and whereafter the structure,molecular weight and properties of the polyborosiloxane were characterized by FTIR,EDS,DSC,TG,and GPC.Oxidized products of the oxidation different stages of the cured resins in air atmosphere were characterized by FTIR,and the weight loss of the cured resins were measured with a thermogravimetric analyzer.Combining infrared characterization of oxide with thermo-gravimetric curve,the reaction characteristics of different stages were analized and the pyrolysis mechanism of cured polyborosiloxane was concluded.The results showed that excessive boric acid can affect molecular weight and gel time of polyborosiloxane resin,and make B-O-Si content increasing during thermal oxidation process,but thermal energy made B-O-Si chemical bond rupture at over 600℃,and polyborosiloxane resin were oxidized to SiO 2,B 2O 3 and a small amount of boron-carbide materials,which effectively improve the heat resis-tance and oxidation resistance of resin.

关 键 词：硼硅氧烷 制备 热性能 热氧化 

分 类 号：O634.4[理学—高分子化学]