偶联剂对硼酸铝晶须/双马来酰亚胺性能的影响

应用自行合成的一类新型硼酸酯偶联剂及硅烷偶联剂等对硼酸铝晶须进行表面处理,考察了硼酸铝晶须对双马来酰亚胺树脂体系性能的影响.结果表明,硼酸酯处理后的晶须对材料的改性作用较硅烷更加显著;硼酸铝晶须添加到双马来酰亚胺树脂中后,材料的弯曲强度在晶须含量为5%时达到最大值,而后随晶须含量的增大稍有下降;随晶须添加量的增大材料的弯曲模量和耐热性逐渐提高;经硼酸酯处理的晶须与树脂基体具有更好的界面粘接.

Influence of coupling agents on properties of aluminum borate whiskers modified BMI resin

The mechanical behavior of aluminum borate whiskers modified BMI resin was investigated. Surface treatment of whiskers by several coupling agents such as silane and borate esters synthesized by our lab were used to improve the interface properties between whiskers and resin. The results showed that borate esters coupling agents treated whiskers made the composites have better surface property than silane treated whiskers and untreated whiskers. Addition of 3% borate ester (BE4) treated whiskers in an BMI resin increased the flexural strength of the composites obviously, and the impact strength of the composites increased, too. The heat distortion temperature and the flexural modulus of the composites increased with the increase of the whisker content. SEM showed that the borate esters coupling agent made the composites have better interface properties. Mixing 3 parts and 100 parts BMI resin, the test piece had impact strength of 12.8 kJ/m~2, flexural strength of 146.4 MPa, flexural modulus of 3.8 GPa, vs. 12.6, 118.0, 3.5 respectively, without aluminum borate whiskers.