摘要
通过核磁共振仪、万能试验机、液相色谱仪等仪器及其表征方法,对比了光气法合成聚碳酸酯(PC)(PC-1,PC-2)与非光气法合成PC(PC-3,PC-4)的微观结构、力学性能、光学性能等的差异,分析了生产工艺对PC微观结构与宏观性能的影响。结果表明:PC-1~PC-4的力学性能相近,并且均添加了蓝色着色剂,PC-4中着色剂添加量最少,亮度最高;PC-1的分子链较长,相对分子质量较大,分散性指数适中,玻璃化转变温度、热变形温度及维卡软化温度均为最高;PC-3,PC-4均显示出明显的交联杂化结构,而PC-1,PC-2中几乎不存在;PC-1和PC-2主要采用叔丁基和苯氧基作为端基封端,而PC-3和PC-4主要以酚羟基和苯氧基作为端基封端;PC-3,PC-4中含残余单体量和含二苯并呋喃量均较高,二苯并呋喃赋予材料荧光性,限制其在光学敏感领域的应用,另外高温产生的交联副产物,增加了熔体黏度;PC-3重均相对分子质量适中,分散性指数小,分子链长度分布高度均一,提升了冲击强度和拉伸性能。
By utilizing characterization methods such as nuclear magnetic resonance spectrometer,universal testing machine,and liquid chromatograph,the differences in microstructure,mechanical property,and optical property were compared between polycarbonate synthesized by phosgene method(PC-1,PC-2)and non phosgene method(PC-3,PC-4).And the influence of production processes on the microstructure and macroscopic properties of PC were analyzed.The results showed that PC-1 to PC-4 exhibited similar mechanical property,and all samples contained blue colorant,with PC-4 having the least colorant addition and the highest luminance.PC-1 possessed longer molecular chain,higher relative molecular weight,and a moderate dispersity index,resulting in the highest glass transition temperature,heat deflection temperature,and Vicat softening temperature.PC-3 and PC-4 displayed distinct cross-linked hybrid structure,which were nearly absent in PC-1 and PC-2.PC-1 and PC-2 primarily used tert-butyl and phenoxy groups as end-capping groups,while PC-3 and PC-4 mainly employed phenolic hydroxyl and phenoxy groups.PC-3 and PC-4 exhibited higher residual monomer content and dibenzofuran levels,with dibenzofuran imparting fluorescence to the material,limiting its application in optics-sensitive fields.Additionally,as a high-temperature cross-linked byproduct,dibenzofuran increased melt viscosity.PC-3 demonstrated moderate weight-average molecular weight,a small dispersity index,and highly uniform molecular chain length distribution,which enhancing its impact strength and tensile properties.
作者
崔禹
郭垠
古哲坤
陈代雯
张璐
CUI Yu;GUO Yin;GU Zhe-kun;CHEN Dai-wen;ZHANG Lu(Research Institute of Zhejiang Petrochemical&Chemical Co Ltd,Zhoushan 316000,China)
出处
《石化技术与应用》
2025年第3期198-203,共6页
Petrochemical Technology & Application
基金
浙江省科技厅资助项目(项目编号:C2020C01010)。
关键词
聚碳酸酯
光气法
非光气法
微观结构
宏观性能
polycarbonate
phosgene method
non-phosgene method
microstructure
macro-property
