A series of amphiphilic acrylate block copolymer (ABC) modified epoxy were prepared by the solution casting method. The mechanical strength, thermal stability, and light transmittance of the modified epoxies were characterized, and the fracture surfaces of the ABC modified epoxy were characterized with multi techniques for the toughening mechanism exploration. The results indicated that the glass transition temperature (T_g) and tensile strength of the ABC modified epoxy would be slight increased as 10 phr ABC was incorporated into epoxy matrix compared with neat epoxy. Surprisingly, the critical strain energy release rate (G_IC) and plan strain fracture toughness (K_IC) of the blend with 10 phr ABC/epoxy were 8 times and 2 times higher than that of the neat epoxy at room temperature, respectively. When the addition amount of ABC reached up to 30 phr, the ABC modified epoxy showed superior adhesion strength and still remained excellent optical property. The nano-cavitation of rubbery core which facilitated shear yielding of the epoxy matrix was found to be the main toughening mechanism. Both theoretical and experimental results strongly indicate that ABC modified epoxy is a new type of composite material with excellent mechanical properties and light transmittance.

通过溶液浇铸法制备了一系列两亲性丙烯酸酯嵌段共聚物（ABC）改性环氧树脂。表征了改性环氧树脂的机械强度，热稳定性和透光率，并通过多种技术对ABC改性环氧树脂的断裂面进行了表征，以探讨其增韧机理。结果表明，与纯环氧树脂相比，当将10 phr ABC掺入环氧树脂基质中时，ABC改性环氧树脂的玻璃化转变温度（T _g）和拉伸强度将略有提高。令人惊讶的是，临界应变能释放率（G _IC）和计划应变断裂韧性（K _IC与10 phr ABC /环氧树脂的共混物的）在室温下分别是纯环氧树脂的8倍和2倍。当ABC的添加量达到30phr时，ABC改性的环氧树脂显示出优异的粘合强度并且仍然保持优异的光学性能。发现橡胶芯的纳米空化促进了环氧基质的剪切屈服，这是主要的增韧机理。理论和实验结果均强烈表明，ABC改性环氧树脂是一种新型的复合材料，具有优异的机械性能和透光率。