【摘要】 通过4-溴苯并环丁烯与苯基二氯膦反应，再经过氧化得到二苯并环丁烯基苯基膦氧(DBPPO),其熔点为107℃,熔融态具有优异的加工性能。DBPPO可以自聚，也可与双马来酰亚胺(BMI-2B)共聚得到膦氧聚酰亚胺。通过改变DBPPO和BMI-2B的物质的量比，制备了一系列的膦氧聚酰亚胺，采用宽频介电阻抗松弛谱仪、热重分析仪、紫外-可见分光光度计和微型燃烧量热仪对其介电性能、热稳定性、光学性能和阻燃性能等进行了研究。结果表明，当DBPPO和BMI-2B的物质的量比为1∶1时，制备的膦氧聚酰亚胺PI-11的介电常数为3.53,介电损耗正切值(1 MHz)为0.052,5%热失重温度为478℃,800 nm透光率为94.5%。此外，PI-11燃烧过程中总释放热与BMI-2B相比降低了45.7%,表明该物质具有很好的阻燃性能。更多还原

【Abstract】 Dibenzocyclobutenyl phenylphosphine oxide(DBPPO)was prepared by the oxidation reaction of the product from the reaction of 4-bromobenzocyclobutene and phenyl dichlorophosphine.The DBPPO shows an excellent processing property with a melting temperature of 107 ℃.DBPPO can self-polymerize or copolymerize with bismaleimide(BMI-2B)to obtain phosphine oxide polyimide.A series of phosphine oxide polyimide were prepared by varying the molar ratios of DBPPO to BMI-2B.The dielectric properties, thermal stability, optical properties and fire resistance properties of phosphine oxide polyimide were investigated via a broadband dielectric impedance relaxation spectrometer, thermogravimetric analyzer, UV-visible spectrophotometer and micro combustion calorimeter.The results show that when the molar ratio of DBPPO to BMI-2B is 1∶1,the prepared phosphine oxygen polyimide(PI-11)has a dielectric constant of 3.53 and a tangent value of dielectric loss of 0.052(1 MHz).The temperature of 5%weight loss of PI-11 is 478 ℃.The transmittance of PI-11 is 94.5%at 800 nm.In addition, compared with BMI-2B,the total heat release of PI-11 during combustion is reduced by 45.7%,indicating the good flame resistance of PI-11.更多还原