环氧树脂改性固化工艺及配方对微观结构的影响

Effects of Curing Technology and Formula on Microstructure of Epoxy Resin

为了探讨固化工艺及配方对环氧树脂体系微观结构的影响,研究了用4,4′-二氨基二苯砜(DDS)作固化剂的环氧树脂与聚醚砜(PES)共混体系。采用差示扫描量热法(DSC)和扫描电镜(SEM)研究其相分离和微观结构,并通过改变聚醚砜的用量和固化工艺条件对其进行控制。结果表明,在环氧树脂与聚醚砜间形成了半互穿网络,对应于环氧态和聚醚砜态的玻璃化转变温度彼此靠近。通过控制反应进程和聚醚砜用量,可以获得不同的相结构,加入较多的聚醚砜或采用较高的固化温度,有利于提高聚醚砜增韧环氧树脂的冲击性能。

Epoxy resin and polyethersulfone(PES) co-fixing system using 4,4'-diaminodiphenyl sulphone(DDS) as curing agent was studied to discuss the effects of curing process and formula.The phase separation and microstructure were investigated by differential scanning calorimetry(DSC) and scanning electron microscopy(SEM),which were controlled by the content of PES and curing process conditions.Results show that semi-interpenetrating networks(Semi-IPN) forms between epoxy resin and PES in which the glass-transition temperatures(t_g) of epoxy resin and PES is close by each other.Thus different phase structures can be obtained by controlling the reaction process and PES content.It is favorable to improve the impact property of PES-toughening epoxy resin with much of PES or higher curing temperature.