新型聚芳醚砜共聚物的制备及其性能

以4,4’-二氯二苯砜、4,4’-二羟基二苯砜和2,4-二羟基二苯砜为单体,通过缩聚合成一系列主链含异构体醚键单元的聚芳醚砜共聚物,利用核磁共振碳谱(13C NMR)、差示扫描量热分析(DSC)和高压毛细管流变仪对产物进行了测试和分析。对比不同产物的熔体黏度、玻璃化转变温度和力学性能,发现随着共聚单元含量的增加,聚芳醚砜共聚物的流动性逐渐提高,玻璃化转变温度逐渐降低,并且屈服点伸长率和缺口冲击强度均逐渐提高。这一结果对实际应用中提高聚芳醚砜树脂流动性和韧性、降低热加工温度等具有重要的指导意义。

Synthesis and Property of Novel Poly(aryl ether sulfone) Copolymers

A series of poly(aryl ether sulfone) copolymers containing isomeric ether bond in the main chains were synthesized from the monomers 4,4’-dichlorophenyl sulfone,4,4’-dihydroxydiphenylsulfone and 2,4-dihydroxydiphenylsulfone through condensation polymerization. The resultant polymers were characterized by carbon-13 nuclear magnetic resonance (13C NMR), differential scanning calorimetry (DSC) and high pressure rheological test. Systematic analyses were performed to study the melt viscosity,glass transition temperature (Tg) and mechanical properties. The results indicate that with increasing the content ofisomeric ether bond in the main chains,Tg of the copolymers gradually decreases,while the flowability,yield strain and notched Izod impact strength increase. The outcomes are conductive to the improvement of flow property and toughness as well as reduction of thermal processing temperature of poly(aryl ether sulfone) polymers in practical application.