Decomposition behavior and decomposition products of epoxy resin cured with MeHHPA in near-critical water

A kind of chemical method that used water as the liquid reaction medium to decompose epoxy resin was studied. The thermosetting epoxy resin was decomposed successfully under the condition of near-critical water. The decomposition rate of epoxy resin raised rapidly as the reaction time and reaction temperature increased. The decomposition reaction products were characterized by infra-red spectra and gas chromatography-mass spectrometry. The phenol, isopropylphenol, 4, 4′-(1-methylethylidene) bis-phenol were found as the main compounds in liquid products, which were common monomers from epoxy resin. When reaction was carried out at the temperature of 260 °C–300 °C, the decomposition mechanism of epoxy resin was envisaged as the ether and ester bonds cracking.     

应用型高校化工原理实验教学改革思考与探索

分析了传统的化工原理实验课程内容体系以及在新的定位模式下存在的问题,结合哈尔滨学院的办学定位和学生的层次水平,本文从转变观念,加强化工原理实验课程建设,实验教学效果建设、实验教学资源建设等环节探讨如何提高化工原理实验课的教学效果,并提出改进办法,指明了化工原理实验教学的改革方向,目的在于培养和发展应用型技术人才。     

木质素与含磷阻燃剂对环氧树脂固化物阻燃性能的影响

利用不同质量比的木质素、苯酐（PA）、环氧树脂（EP）、2-（二苯基磷酰基）琥珀酸（DPPOSA）共固化制备出一系列环氧树脂固化物,采用极限氧指数测试、UL-94垂直燃烧评级测试、锥形量热仪热释放速率和总热释放量测试、空气条件下的热重分析测试和扫描电镜对环氧固化物进行测试和分析。当EP为90.0%、PA为6.5%、DPPOSA为2.0%、木质素为1.5%时制备的环氧固化物（P-12）的热稳定性能和阻燃性能得到了明显的改善。阻燃性能测试表明：其极限氧指数（LOI）达到34.6%,垂直燃烧测试通过UL-94的V-0级,热释放速率和热释放总量也有效降低;热降解测试结果表明：DPPOSA和木质素的加入可以使材料的降解时间提前,成炭能力增强;扫描电镜结果显示：添加DPPOSA和木质素的环氧固化物燃烧后形成连续、均一、紧密的炭层,进一步证明DPPOSA和木质素的加入使环氧固化物的成炭能力得到增强。     

新型含磷阻燃剂2-(二苯基磷酰基)琥珀酸的合成条件优化

以二苯基氧膦(DPPO)和马来酸(MA)为原料合成新型含磷阻燃剂2-(二苯基磷酰基)琥珀酸(DPPSA),采用傅里叶变换红外(FT IR)光谱,¹H NMR和¹³C NMR核磁共振光谱表征化合物,并利用正交试验对反应的条件进行优化。结果表明,产物结构与目标产物结构一致,最佳反应条件为反应时间为20 h,n(DPPO)∶n(MA)为1.0∶1.3,溶剂用量为200 mL,DPPSA产率为83.4%。