纳米粒子改性环氧树脂玻璃化转变温度的研究

采用示差扫描量热分析(DSC)研究了纳米A l2O3粒子改性的环氧树脂基体玻璃化转变温度与纳米粒子含量之间的关系以及纳米粒子含量对改性体系固化剂用量的影响。结果表明,随着纳米粒子含量的提高,改性树脂的玻璃化转变温度逐渐下降,由纯树脂的224℃下降到182.5℃(纳米粒子用量30%,固化剂添加量70%)。并且纳米粒子的加入会影响树脂基体的固化反应。达到玻璃化转变温度峰值时的固化剂用量并非按照改性体系中环氧树脂含量等当量比加入,而是与纳米粒子含量有关,纳米粒子含量越高,达到玻璃化转变温度峰值时固化剂用量越少。

Study on glass transition temperature of epoxy matrix modified with nano-Al_2O_3

Relationship between glass transition temperature of the epoxy matrix modified with nano Al2O3 and content of nano particles and the effect of nano particles contens on the curing agent amount were studied by DSC.The results showed that the Tg of epoxy/nano-Al2O3 decreased with the increasing of nano-Al2O3 contents.The Tg was decreased form 224 ℃(pure resin) to 182.5 ℃(nano Al2O3 content 30% and curing agent amount 70%).The curing reaction of epoxy matrix was affected by adding the nano particles.The Tg of the composite did not reach the peak value as the curing agent was added with equal equivalence of epoxy groups.The amount of curing agent was related with the content of nano particles in the composites and the more nano particles contents,the lower curing agent amount reached the max Tg.