A phosphorus-containing bio-based epoxy resin (EADI) was synthesized from itaconic acid (IA) and 9,10-dihydro-9-oxa-10-phosphaphenanthrene 10-oxide (DOPO). As a matrix, its cured epoxy network with methyl hexahydrophthalic anhydride (MHHPA) as the curing agent showed comparable glass-transition temperature and mechanical properties to diglycidyl ether in a bisphenol A (DGEBA) system as well as good flame retardancy with UL94 V-0 grade during a vertical burning test. As a reactive flame retardant, its flame-resistant effect on DGEBA/MHHPA system as well as its influence on the curing behavior and the thermal and mechanical properties of the modified epoxy resin were investigated. Results showed that after the introduction of EADI, not only were the flame retardancy determined by vertical burning test, LOI measurement, and thermogravimetric analysis significantly improved, but also the curing reactivity, glass transition temperature (T g), initial degradation temperature for 5% weight loss (T d(5%)), and flexural modulus of the cured system improved as well. EADI has great potential to be used as a green flame retardant in epoxy resin systems.
从
衣康酸(IA)和9,10-二氢-9-氧杂-10-
磷杂
菲10-氧化物(
DOPO)合成了一种含
磷生物基环氧
树脂(EADI)。以
磷化环氧
树脂为基体,采用甲基六氢
邻苯二甲酸酐(M
HHPA)作为固化剂,所制得的
磷化环氧
树脂固化网络的
玻璃化转变温度和力学性能与
双酚A二缩水甘油醚(DGEBA)体系相当,垂直燃烧测试中具有UL94 V-0级阻燃性能。进一步将其作为反应型阻燃剂,考察了其对DGEBA/M
HHPA体系的阻燃效果、固化行为以及改性环氧
树脂的热学和力学性能的影响。结果表明,EADI的引入不仅显著提高了垂直燃烧测试、LOI测定和热重分析确定的阻燃性能,而且提高了固化反应性、
玻璃化转变温度(Tg)、初始降解温度(Td(5%))和弯曲模量。EADI作为一种绿色阻燃剂在环氧
树脂体系中具有很大的应用潜力。