二甲基取代杂环联苯聚芳醚的合成与性能

由自制的二甲基取代类双酚4-(3,5-二甲基-4-羟基苯基)-2,3-二氮杂萘-1-酮(DM-HPPZ)单体和4,4'-二氟二苯酮、4,4'-二氯二苯砜进行亲核缩聚反应,制备了一类新型的二甲基取代聚芳醚酮、聚芳醚砜及其共聚物聚芳醚砜酮树脂材料.在适宜的聚合条件下,获得了高分子量的聚合物,其特性粘度为0.44～0.75DL·g^-1.利用DSC和TGA研究了聚合物的耐热性能,结果表明,新型聚芳醚玻璃化温度高(568～595K),耐热稳定性好(5%热失重温度大于416℃);拉伸强度为45.4～85.0MPa,力学性能优良.新型聚芳醚在氯仿、DMAc等极性有机溶剂中可溶解并浇铸得到透明、韧性高的薄膜.共聚物结合了聚醚酮好的力学性能和聚醚砜高的耐热性的特点,因此综合性能更佳.

Studies on Synthesis and Properties of Novel Polyarylether Containing Dimethyl-substituted Phthalazinone Moieties

Anovel bisphenol like compound, 4-(3,5-dimethyl-4-hydroxylphenyl)-2,3 phthalazine1 none (DM HPPZ) was used to successfully prepare a kind of thermal stable polyarylethers with 4,4'-diflourodiphenylketone(Ⅰ) and 4,4'-dichlorodiphenylsulphone(Ⅱ) via nucleophilic substitution. High molecular weight polymers with inherent viscosity more than 44.2-75 mL/g are acquired in 7-75 h. These polymers exhibit a higher glass transition temperature( T_g=568-595 K) than unsubstituted polymers( T_g=536-578 K) and good thermostability with 5% weight loss at the temperature above 689 Kin nitrogen. Also the copolymers(PPESK) with different ratios of Ⅰ to Ⅱ aimed at the combination of the excellent strength of PPEKand the high temperature resistance of PPESare obtained. The polymers have a tensile strength in the range of 454-850 MPa. They are readily soluble in polar aprotic solvents such as chloroform, N,Ndimethylacetamide etc, and are easily cast into flexible, transparent films from them.