RTV有机硅密封胶的耐介质性

通过介质浸泡试验研究了水、机油、汽油对有机硅密封胶的影响，采用初期耐压性衡量其密封性。试验表明，有机硅密封胶具有优异的耐水性和耐油密封性，但耐汽油性较差；重质碳酸钙可提高其耐油性，有机硅密封胶中的增塑剂在油类介质中会发生迁移。该类密封剂可用作机械部的就地成形垫圈。     

碳酸丙烯酯脱碳装置技术改造小结

在碳丙脱碳装置中增加了贫液氨冷器 ,改造了碳丙泵 ,增设了变换气氨冷器 ,从而提高了碳丙脱碳装置的吸收和再生效果     

多孔碳酸钙陶瓷-人造珊瑚的研究

天然珊瑚有三维贯通的多孔网络结构，它的主要成分碳酸钙(CaCO3)在人体环境可降解。模拟珊瑚的组成与结构，研制新型的组织工程支架材料有着良好的应用前景。本文探索了多孔碳酸钙陶瓷的制备方法，并通过盐析法制备了一种多孔的碳酸钙陶瓷，有望获得高的孔隙率和孔连通性。     

提高镁回收率的途径及效益分析：白云石碳酸化法生产轻质碳酸镁新工艺研究

本文提出了白云石碳酸化法生产轻质碳酸镁，二次碳酸化法新工艺的理论依据、实验结果及技术经济分析。     

丙碳脱碳溶剂的改进研究

介绍一种由丙碳、叔胺和少量活化剂构成的复合溶剂的开发，并详细地测定了不同压力和操作工况下，这种复合溶剂对ＣＯ２的吸收和解吸性能，以及溶剂的缓蚀性能和抗氧化性能．实验证明这种复合溶剂与纯丙碳相比，具有吸收容量大、速率快、脱碳净化度高、对设备无腐蚀等特点，对改进现行的丙碳脱碳工艺具有应用价值．     

前驱体热解法制备Al2O3的物相转变及其合成

本文着重考查了Al2O3的前驱体一碳酸铝铵沉淀的形成过程及煅烧过程物相变化，发现可通过调节反应条件和加入合适的表面活性剂，来控制碳酸铝铵晶核的形成及晶体的生长速度，有效地阻止了Al2O3的团聚，并在温度1150摄氏度下制备出分散的Al2O3，其平均粒径为－2um，比表面为－3m^2/g。     

铝系阻燃剂阻燃PP的力学性能研究

将用偶联剂处理的碱式碳酸铝镁加入到聚丙烯中，通过对体系阻燃性、力学性能等研究得出：碱式碳酸铝镁能够对聚丙烯起到良好的阻燃效果，碱式碳酸铝镁的加入提高了聚丙烯的冲击强度，当碱式碳酸铝镁质量分数为23％时，体系的冲击强度最高。研究了偶联荆的用量对体系力学性能的影响，结果表明，随偶联荆用量的增加，体系的拉伸强度降低，冲击强度先升高后降低，当偶联荆质量分数为1．0％时，体系的冲击强度最高。     

N-甲基吗啉绿色合成研究

N-甲基吗啉生产的传统工艺条件苛刻,对设备腐蚀严重、对人体造成巨大危害、对环境造成严重污染.利用碳酸二甲酯和吗啉为原料合成了N-甲基吗啉,采用正交试验方法讨论了原料配比、反应时间、反应温度对收率的影响,并得出了优选反应工艺条件为:物料配比为n(C4H8NO):n(C3H6O3)=1:1.2,反应时间为3 h,反应温度为100 ℃.在此条件下的产品经色质联用仪检测,产品收率可以达到95%以上.结果表明:此法具有原料价廉易得、操作容易控制、不污染环境,是一条简单易行的典型的绿色合成途径.     

Dishwashing performance of mixed palm stearin sulfonated methyl esters and polyoxyethylene sorbitan esters

The detergency profiles of sodium salt α-sulfonated methyl esters derived from palm stearin (α-SMEPS) and polyoxyethylene (20) sorbitan monoesters (POESE) in mixed micelle systems were evaluated as a function of the weight ratios of α-SMEPS/POESE [polyoxyethylene (20) sorbitan monolaurate (12), polyoxyethylene (20) sorbitan monostearate (18∶0), and polyoxyethylene (20) sorbitan monooleate (18∶1)] at different water hardness values (5.12, 51.2, and 512.0 ppm CaCO₃) and temperatures (20, 30, 45, and 65°C), respectively. All the mixtures of α-SMEPS/POESE (12, 18∶0, and 18∶1) systems exhibited a synergistic effect at 65°C in the absence of hardness. This was evaluated by measuring the percentage of soil removed. The systems showed an increase in detergency with both the temperature and water hardness. Maximal detergency was observed with 5.12 ppm CaCO₃ in the mixed surfactant solution.     

Preparation,characterization and in vitro drug release properties of polytrimethylene carbonate/polyadipic anhydride blend microspheres

Polyadipic anhydride (PAA), an aliphatic polyanhydride, and polytrimethylene carbonate (PTMC), an aliphatic polycarbonate, were synthesized via ring opening polymerization of oxepan‐2,7‐dione and melt‐condensation of trimethylene carbonate (1,3 dioxan‐2‐one), respectively. PTMC–PAA blend microspheres containing different ratios of buprenorphine HCl (2, 5, and 10%) were prepared by an oil‐in‐oil emulsion solvent removal method. Microspheres with different ratios of PTMC–PAA (85/15, 70/30, and 55/45) containing 5% buprenorphine HCl were prepared. Microspheres were spherical with visible cracks and pores on the surface. The average particle size of microspheres was around 200 μm for all microspheres. Drug loading efficiency of PTMC–PAA microspheres (85/15, 70/30, and 55/45) was 97.2, 95.2, and 70.2%, respectively. With the increase in the PTMC ratio, the melting point and the enthalpy of melting were both decreased. The mechanism for drug release from PTMC–PAA blend microspheres were generally a combination of drug diffusion through polymers and biodegradation of the polymers. In first three days, the release from microspheres followed zero order kinetics and was dependent on the PAA content. After three days the drug release from microspheres followed first order kinetics. In conclusion it was demonstrated that buprenorphine HCl release from microspheres could be successfully controlled by using different ratios of PTMC–PAA blends. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 2377–2383, 2006