腰果酚基环氧磷酸酯对E-51/IPDA环氧树脂体系性能的影响

摘要

A cardanol-based phosphate epoxidized( CGEP) was synthesized using cardanol. as feedstock. The curing system of bisphenol A epoxy resin(E-51) and isophorone diamine(IPDA) was modified by CGEP in different mass ratios. The influences of CGEP on the viscosity of E-51 and on the properties of cured epoxy resins were investigated. The microstructure of fracture surface of cured epoxy resins was characterized by scanning electron microscope( SEM) . It was found that CGEP has significantly diluted the E-51 and involved in the curing reaction of epoxy resin. When the content of CGEP was 15 wt% with respect to E-51, the impact strength of cured epoxy resins reached the maximum 22. 06 kJ/m2 . When the content of CGEP was 20% with respect to E-51, the tensile strength and bending strength of cured epoxy resins reached the maximum 96. 19 Mpa and 99. 70 Mpa, respectively. With the increase of the amount of CGEP from 0% to 25% , the glass transition temperature ( Tg ) of the cured product decreased from 144. 82℃ to 119. 10℃, while the oxygen index increased from 19. 0 to 23. 0. SEM analysis showed that the toughness of cured epoxy resins improved obviously.%以天然腰果酚为原料制备了一种腰果酚基环氧磷酸酯(CGEP)稀释剂,并利用CGEP改性双酚A型环氧树脂(E-51)及异佛尔酮二胺(IPDA)固化体系.研究了CGEP用量对环氧树脂E-51的稀释效果及其固化物性能的影响,并采用扫描电镜(SEM)分析了固化物的断面微观形貌.结果表明:CGEP对环氧树脂E-51具有显著的稀释作用;CGEP参与固化交联反应后,环氧树脂固化物的机械性能明显提高,当CGEP添加量为E-51质量的15％时,固化物的冲击强度达到最大值22.06 kJ/m2;当CGEP添加量为E-51质量的20％时,固化物的拉伸强度与弯曲强度分别达到最大值96.19和99.70 MPa.随着CGEP用量从0％增加到25％,固化物的玻璃化转变温度由144.82℃降至119.10℃,而氧指数(LOI)由19.0提高到23.0.SEM分析表明CGEP对环氧固化物具有显著的增韧效果.