Synthesis and properties of high temperature phthalonitrile polymers based on o, m, p-dihydroxybenzene isomers
作者:Xinggang Chen、Shuyan Shan、Jiayu Liu、Xiongwei Qu、Qingxin Zhang
DOI:10.1039/c5ra15321b
日期:——
4′-diaminodiphenyl ether were recorded by DSC. The result shows that the processabilities of o-BDB and m-BDB are superior to p-BDB due to lower melting points and broader processing windows. The structures of the cured phthalonitrile polymers were characterized by FTIR and WXRD, and thermal stabilities were evaluated by TGA and all the polymers exhibit excellent thermal and thermal-oxidative stabilities. Dynamic
一系列具有邻,间,对-二羟基苯异构体的高温邻苯二甲腈单体,即1,2-双(3,4-二氰基苯氧基)苯(邻-BDB),1,3-双(3,4-二氰基苯氧基) )通过容易地亲核取代4-硝基邻苯二甲腈的硝基取代基合成苯(m -BDB)和1,4-双(3,4-二氰基苯氧基)苯(p -BDB)。通过FTIR,1 H NMR和WXRD表征单体的结构。通过DSC记录了单体与4,4'-二氨基二苯醚的固化行为。结果表明,o -BDB和m -BDB的可加工性优于p-BDB由于较低的熔点和较宽的加工范围。通过FTIR和WXRD对固化的邻苯二甲腈聚合物的结构进行了表征,并通过TGA对热稳定性进行了评估,所有聚合物均表现出优异的热稳定性和热氧化稳定性。动态力学分析表明该聚合物具有高的储能模量和高的玻璃化转变温度。因此,o -BDB和m -BDB聚合物比p -BDB聚合物表现出更优异的加工性能,热稳定性和机械性能,而p -BD