乙交酯与丙交酯共聚反应和竞聚率的测定

乳酸一羟基乙酸共聚物（PLG）是一种很好的生物医用材料，具有良好的生物相容性和生物降解性，对人体无毒害，可用作医用缝合线[1]、药物缓释胶囊[2]、内固定及牙科材料等[3]．Gilding和Reed[4]在乙交酯和丙交酯共聚反应转化率较高（12．9％～16.4％）时，利用二元共聚方?..     

COPOLYMERS OF CHLOROETHYL METHACRYLATE, GLYCIDYL METHACRYLATE, AND METHYL METHACRYLATE AS SYNCHROTRON RADIATION x-RAY PHOTORESISTS

The copolymers of chloroethyl methacrylate (CMA), glycidyl methacry-late (GMA), and methyl methacrylate (MMA) were synthesized in benzene solution. Theirbreadths of the molecular weight distributions are 2.1 and 2.3, respectively The ther-mal stability of P(GMA-CMA) is superior to that of P(CMA-MMA). The resolutionsof P(CMA-MMA) and P(GMA-CMA) photoresists were found to be 0.1～0.16μm and0.17 ～0.2μm, respectively.     

熔融法制备EVA/OMMT纳米复合材料及其热性能和动态力学性能

熔融法制备EVA/OMMT纳米复合材料及其热性能和动态力学性能;乙烯-醋酸乙烯酯共聚物;蒙脱土;动态储能模量     

中西药结合抗菌性甲壳胺复合膜的制备及其体外释放

利用甘油作为增塑剂，制备了以甲壳胺／淀粉／聚乙烯醇为基材的含有原儿茶酸（对烧伤、创伤有特效的中药）和环丙沙星（杀菌性能最强的抗菌剂）等的复合型生物敷料，研究了不同条件下制备的敷料膜其抗菌剂在林格试剂中的静态释放情况，并对释放机理进行了探讨．     

PLASMA POLYMERIZATION OF ACETYLENE/CO_2/H_2

A study has been made on the plasma polymerization of acetylene/CO_2/H_2 in a capacitively coupled RF plasma. The monomer mixture yielded a crosslinked film with light brown color. A kinetic study is reported for the plasma polymer ization of acetylene/CO_2/H_2. The effects of discharge power level and reactor geometry on the rate of polymer formation are reported. The structure of the plasma polymer is investigated by IR study.     

辐射接枝医用水凝胶的研究Ⅰ.硅橡胶辐射接技N-乙烯基吡咯烷酮

采用填加SiO_2增强的甲基乙烯基硅橡胶混炼压片。通过~(60)Co-γ射线引发辐射硫化,利用共辐照方法,将N-乙烯基吡咯烷酮接枝到该硅橡胶上,制备了高纯度医用水凝胶。本文较系统地研究了接枝单体浓度、辐照剂量率、剂量、温度和接枝试片厚度等因素对接枝共聚反应的影响。建立了接枝速率与单体浓度、剂量率之间的动力学关系式:R_g=k[M]~(4/5)D~(1/2)。讨论了反应机制和接枝区域。     

水溶性微晶壳聚糖的制备及结构

采用HCl和H3PO4的水／醇溶液为反应介质降解壳聚糖，并用无水乙醇沉淀和洗涤，制备出收率超过95％的水溶性的微晶壳聚糖，其晶体尺寸为400－800mm，晶型完全不同于固体粉末聚糖，这两种微晶的红外光谱酰胺峰（1650，1600cm^-1）已完全消失，而在1620，1520cm^-1附近出现了－NH3^ 的反对称变形振动和对称变形振动双峰，并发现用HCl制得的微晶壳聚糖溶于冷水，用H3PO4制得的微晶壳聚糖可以均匀分散于冷水而溶于60℃热水。