材料期刊网

以双马来酰亚胺(MBMI)为基体,3,3'-二烯丙基双酚A(BBA)和双酚A双烯丙基醚(BBE)为活性稀释剂,环氧树脂(EP)为增韧剂,4,4'-二氨基二苯甲烷(DDM)为固化剂,制备了改性双马来酰亚胺树脂(EP-MB-MI),并对其性能进行研究.结果表明:随着EP含量的增加,材料的弯曲强度呈先上升后下降的趋势,当EP含量为20％时,EP-MBMI体系的弯曲强度最大,为134.5 MPa,比MBMI的弯曲强度提高了22.8％.另外,EP-MBMI体系的介电常数随EP含量的增加呈下降的趋势,且在环氧树脂含量在20％时介电常数达到最小值;介质损耗随EP含量的增加有所增加,但数量级均为10-3;EP-MBMI体系的体积电阻率及电气强度随EP含量的增加呈先增大后减小的趋势,并分别在EP含量为15％及20％时取得最大值,分别为4.87×1015Ω·m和15.66 kV/mm.

An epoxy modified bismaleimide resin (EP-MBMI) was prepared using bismaleimide (MBMI) as matrix,3,3'-diallylbisphenol A (BBA) and bisphenol-A diallylether (BBE) as reactive diluent,epoxy resin (EP) as toughening agent,and 4,4'-diaminodiphenylmethane (DDM) as curing agent.Its properties were studied.The results show that with the increase of EP content,the bending strength of EP-MBMI system increases at first and then decreases.When the EP content is 20％,the bending strength attains the maximum value (134.5 MPa),which is 22.8％ higher than that of MBMI.Additionally,the dielectric constant of EP-MBMI system decreases with the increase of EP content,and attains the minimum value at 20％ of EP content.The dielectric loss of EP-MBMI system increases with the increase of EP content,but the order of magnitude is 103.The volume resistivity and electric strength of EP-MBMI system increase at first and then decrease with the increase of EP content.When the EP content is 15％ and 20％,the volume resistivity and electric strength reach the maximum value (4.87×1015 Ω·m and 15.66 kV/ mm,respectively).