通过三步反应合成新的含氟双酚单体3,4-二氟苯基对苯二酚,由该含氟双酚单体、4氟苯基对苯二酚、苯基对苯二酚分别与4,4′-二氟二苯酮、4,4′-二氯二苯砜经亲核缩聚反应,制备了一系列新型聚芳醚酮和聚芳醚砜。采用傅里叶变换红外光谱仪、核磁共振波谱仪、调制式差示扫描量热仪、热失重仪及 X 射线衍射仪等对聚合物的结构和性能进行了表征和研究,结果表明,合成的聚芳醚酮和聚芳醚砜具有优异的耐热性能,玻璃化转变温度分别在150～159℃和177～196℃之间,氮气中5%热失重温度分别在527℃和507℃以上。合成的聚芳醚酮和聚芳醚砜具有良好的溶解性,室温下能溶解在 N-甲基吡咯烷酮、二甲基乙酰胺、氯仿等有机溶剂中。
The (3,4-difluoro) Phenylhydroquinone (PHQ) have been successfully synthesized through the reaction of 3,4-difluoroaniline and 1,4-benzoquinone,and characterized by Fourier transform infrared spectroscopy(FTIR) and Raman spectroscopy.The ground-state geometries of the three PHQ isomers were distinguished using density functional theory(DFT) at the B3LYP/6-311G+(d,p) level without symmetry constraints.The results show that the predicted FTIR and Raman spectra are highly consistent with experimental spectra.
The effect of coagulation temperature on the morphology, microstructures and mechanical properties of dihydroxy poly(p-phenylene benzobisoxazole) (DHPBO) fibers was investigated during dry-jet wet-spinning process, in which the coagulation bath concentration and drawn ratio were kept as 10 wt% of PPA in water and 1.7, respectively. The structures and mechanical properties of the as-spun DHPBO fibers were characterized by FTIR, XRD, SEM, and single fiber tensile testing. The results indicated that in PPA/H2O coagulation system, when the coagulation temperature was 25°C, highly crystallized DHPBO as-spun fibers possessing fine crystallites, circular and smooth morphology, and excellent mechanical properties could be achieved.
Tao Zhang JunHong Jin DaYong Hu ShengLin Yang Guang LiJianMing Jiang
