一步原位聚合法制备电泳显示微胶囊的研究

用一步原位聚合法制备了电泳显示微胶囊.考察了系统调节剂、搅拌、壁材用量对微胶囊的粒径分布及其形貌的影响.实验结果表明,在搅拌速度为700r/min,pH值为1.5～2.0条件下,以明胶作为系统调节剂,脲醛树脂作为壁材,可以制得具有透明囊壁的球形微胶囊,粒径分布在20～70μm之间.采用合适的壁材用量可以获得高紧密度的囊壁.该法制备的微胶囊可望在电泳显示材料中有较好的应用.     

羧基封端的聚苯硫醚的合成及热学性能研究

为了研究羧基封端聚苯硫醚(PPS)结构对其反应活性和热学性能的影响,合成3种羧基封端PPS并通过红外(FTIR)、端基含量测定、裂解气质联用(py-GC/MS)、高温凝胶渗透色谱(HTGPC)、热重(TGA)、差示扫描量热(DSC)等方法,获得改性样品的端基转化率、裂解机理、反应活性和熔点等参数.结果表明,羧基对PPS...     

旋转填充床内高黏介质脱挥过程的传质模型(英文)

A mass transfer model for devolatilization process of highly viscous media in rotating packed bed(RPB) was developed based on penetration theory and mass conservation.Before establishing the model,some mass transfer experiments of thin film were conducted in a designed diffusion cell including vacuum and feeding system. In this study,acetone was used as the volatile organic compound(VOC) and syrup as the highly viscous media.The thickness of thin film was changed by using different liquid distributor.It was found that bubbling played an important role in the devolatilization.The correlation of diffusion coefficient of acetone in highly viscous dilute solution was proposed.The relative error between predicted and experimental data was within the range of ± 30% for diffusion coefficient of acetone in syrup.A comparison of experimental data of RPB with model indicated that the relative error was within ± 30% for efficiency of acetone removal.     

旋转填充床内高黏介质脱除有机挥发组分过程强化

The removal of a volatile organic compound (VOC) from high viscous liquid was carried out in a rotating packed bed (RPB) in this study. The mixed liquid of syrup and acetone was used as simulated high viscous polymer solution with acetone as the volatile compound. The influence of the rotating speed of RPB, liquid viscosity, liquid flow rate, vacuum degree, and initial acetone content in the liquid on acetone removal efficiency was investigated. The experimental results indicated that the removal efficiency increased with increasing rotating speed and initial acetone content in the viscous liquid and decreased with increasing liquid viscosity and flow rate. It was also observed that acetone removal efficiency increased with an increasing vacuum degree and reached 58% at a vacuum degree of 0.1 MPa. By the comparison with a flash tank devolatilizer, it was found that acetone removal ef-ficiency in RPB increased by about 67%.     

表面改性的TiO2用作电泳粒子的研究

用Al2O3改性TiO2粒子,并用XPS、XRD、FT-IR表征了粒子的表面组成和结构.采用静态沉降法和粒度分布探讨了粒子在四氯乙烯中的分散稳定性,并利用自行设计的电泳仪对粒子的电场响应特性进行测试.考察了温度、pH值、转速等改性条件对粒子分散性和带电性的影响.实验结果表明,最佳改性条件是温度在85～90℃、pH值为8～9, 搅拌速度在800 r(min(1.改性后的粒子分散性和带电性有明显的提高,粒子对电场有可逆响应.     

超重力旋转填充床用于高黏聚合物脱挥的研究进展

针对高黏聚合物体系脱挥过程的特点,指出聚合物脱挥技术推广的关键是开发高速表面更新的新型高效传质设备。工业上常规的脱挥设备存在不同的使用限制,本文提出了设计新型旋转填充床用于高黏聚合物脱挥的可能性,并类比螺杆挤出机结构介绍其脱挥机理。结果表明,相比常规的脱挥设备,旋转填充床脱挥效率高,能耗低。采用该技术对丙烯腈系聚合物进行两次循环脱挥处理,丙烯腈脱除率达到99%以上。在脱挥过程中,解吸的挥发分气体在第一时间离开填料层,并迅速由真空泵抽走,防止了挥发分的二次溶解。     

对二氯苯和N-甲基-4-氨基丁酸钠的反应动力学

为了探究对二氯苯(DCB)与N-甲基-4-氨基丁酸钠(SMAB)的反应对聚苯硫醚(PPS)聚合反应的影响,采用动力学方法研究PPS聚合条件下DCB与SMAB的反应。通过分析反应网络、简化反应过程,建立产物N,N′-二甲基-N,N′-(1,4-亚苯基)-4,4′-二氨基二丁酸钠、N,N′-二甲基-N,N′-(1,3-亚苯基)-4,4′-二氨基二丁酸钠(均记为d-SPMAB)、N-甲基-N-(3-氯苯基)-4-氨基丁酸钠(m-SCMAB)、N-甲基-N-(4-氯苯基)-4-氨基丁酸钠(p-SCMAB)和对氯苯酚钠(p-SCP)的生成反应动力学模型;根据质量作用定律、采用稳态假设,推导出各产物的生成反应动力学方程,并运用实验数据进行线性拟合。结果表明：产物d-SPMAB、m-SCMAB、p-SCMAB和p-SCP的生成反应表观活化能分别为168.8、154.5、120.3和131.6 kJ·mol^-1;增大SMAB与DCB物质的量比可以加快反应,但不改变反应机理;水有利于DCB的水解反应,但溶剂化作用会阻碍DCB与SMAB的取代反应。