摘要
采用氮气吹扫工艺,在较低的真空度下将碳酸二苯酯(DPC)与氢化双酚A(HBPA)熔融酯交换,合成氢化双酚A型聚碳酸酯(HBPA–PC)预聚体。研究了氮气吹扫熔融酯交换法的工艺条件,对HBPA–PC预聚体的结构采用傅立叶变换红外光谱(FTIR)法表征,热性能由差示扫描量热(DSC)法表征、特性黏度和外观由乌氏黏度计和紫外可见分光光度计来表征,比较了在相同反应条件下HBPA–PC预聚体和双酚A型聚碳酸酯(BAPC)预聚体的结构和性能。结果表明,合成的样品具有聚碳酸酯结构,在相同合成条件下生成的HBPA–PC预聚体的色差低于BAPC预聚体,熔融温度高于BAPC预聚体。当DPC与HBPA的物质的量之比为1.06∶1,催化剂用量LiOH与HBPA的物质的量之比为0.00048∶1,170~190℃反应25 min,200~220℃反应30 min时,特性黏度为14.72 mL/g,色差为2.90,熔融温度为220.1℃。
The hydrogenated bisphenol A polycarbonate prepolymer was synthesized from diphenyl carbonate(DPC)and hydrogenated bisphenol A(HBPA)by melt transesterification in the N2 sweep fluid and low vacuum degree.The prepolymer was analyzed using some simple methods,and its structure was determined by Fourier transform infrared spectroscopy,thermal property was determined by differential scanning calorimetry,intrinsic viscosity was determined by ubbelohde viscometer,and appearance of the product was determined by ultraviolet-visible spectrophotometer and Ubbelohde viscometer.The structure and properties of hydrogenated bisphenol A polycarbonate(HBPA–PC)prepolymer were compared to that of bisphenol A polycarbonate(BAPC)pre-polymer.The results show that the structure of the polymer indicates that the polymer is polycarbonate.The prepolymer of HBPA-PC have lower than the prepolymer of BAPC in color property,and have higher than the prepolymer of BAPC in the melting tempera-ture under the same synthesis condition in thermal stability and color property.The optimum synthesis conditions are obtained as follows:the dosage of catalyst is 0.00048 mol(1 mol HBPA),the molar ratio between DPC and HBPA is 1.06∶1,polycondensa-tion time is 25 min in the range of 170–190℃,polycondensation time is 30 min in the range of 200–220℃.The intrinsic viscosity,the chromatic aberration and the melting temperature of HBPA–PC prepolymer under the optimum conditions are 14.72 mL/g,2.90,220.1℃,respectively.
作者
王金
Wang Jin(Department of Chemical and Environmental Engineering,Wuhan University of Bioengineering,Wuhan 430415,China)
出处
《工程塑料应用》
CAS
CSCD
北大核心
2021年第10期39-43,共5页
Engineering Plastics Application
基金
武汉市教育局科研项目(2011079,2015105)。
关键词
氢化双酚A
熔融酯交换
聚碳酸酯预聚体
hydrogenated bisphenol A
melt transesterification
polycarbonate prepolymer
