Mg(OH)2表面处理对LDPE力学性能及加工性的影响

选择了多种偶联剂对氢氧化镁（MH）进行表面处理；研究了表面处理对LDPE／MH体系的力学、加工和分散性能的影响。结果表明，偶联剂能显著提高材料的断裂伸长率，但会略微降低其拉伸强度。硅烷、钛酸酯偶联剂的最佳使用量在1％～2％；而脂肪酸处理剂的最佳使用量在4％～6％。偶联剂的选择影响到材料的力学性能，脂肪酸ste—zn，硅烷偶联剂中Al51，钛酸酯偶联剂JN201有较好的处理效果。表面处理体系有较好的流动性和加工性能。SEM观察表明，未经表面处理体系的粒子分散性比经表面处理体系的粒子分散性要差。     

纳米TiO_2改性苯丙乳液内墙涂料的研究

采用物理掺和法,在苯丙乳液中加入锐钛型纳米TiO2,制成内墙涂料,进行抑菌试验和甲醛降解实验研究,分析了纳米TiO2的光催化原理和抗菌机理。结果表明,随着TiO2含量增加,甲醛降解能力和抗菌性能增强,当TiO2含量为4%时效果最好。     

三聚氰胺甲醛树脂合成与性能的研究

本文针对三聚氰胺甲醛树脂合成与性能上存在的几个问题，从理论和实践上进行了讨论。     

SBR反应器中反硝化条件下去除苯酚工艺

基于异养反硝化原理,在序批式间歇反应器(SBR)中对反硝化同时降解苯酚的菌种进行了149 d的驯化,驯化通过逐步提高进水中苯酚和NO3--N的浓度进行.驯化结束后,进水苯酚质量浓度达到360 mg/L,葡萄糖质量浓度达到100 mg/L,NO3--N质量浓度达到240 mg/L,水力停留时间6 h,苯酚和NO3--N去除率均大于98%.反应器运行结果表明:进水苯酚质量浓度低于720 mg/L时,SBR反应器运行稳定;高浓度NO2--N(＞60 mg/L)可以严重影响微生物对苯酚以及NO3--N的去除能力,同时反应器中20.5%～23.5%的COD可被用于微生物的细胞合成.     

多点多板多分型面注塑模具的简化设计

应用锁扣装置、组合拉杆结构，减少导柱数量，简化了多点多板多分型面注塑模具的设计。     

Synthesis and characterization of novel sulfonated poly(arylene ether ketone)s derived from 4,4'-sulfonyldiphenol

Summary Novel sulfonated poly(arylene ether ketone)s were prepared directly by aromatic nucleophilic polycondensation of 4,4'-sulfonyldiphenol with various ratios of 4,4'-difluorobenzophenone to 5,5'-carbonylbis(2-fluorobenzenesulfonate) in dimethyl sulfoxide. The resulting polyelectrolytes were characterized by IR, NMR, TGA and DSC. The 10% weight loss temperature of the products is higher than 510°C, and their glass transition temperature is above 260°C. The introduction of 4,4'-sulfonyldiphenol with powerful electron-withdrawing group, -SO₂₋, into the main chain of sulfonated poly(arylene ether ketone)s improves the thermal stability against desulfonation. The ion-exchange capacity and swelling of the polyelectrolyte membranes were measured, which are higher than 1.23meq/g and not higher than 20.9%, respectively. The membranes show very good perspectives in polymer electrolyte fuel cell (PEMFC) application. Received: 27 March 2002 / Revised version: 7 May 2002 / Accepted: 13 May 2002     

纳米材料在涂料中的应用

简述了纳米微粒的基本性质，介绍了几种典型的功能纳米材料在涂料中的应用．并探究其对涂料的改性原理．对应用中存在的问题进行了剖析。     

Synthesis, characterization of bimetallic Sn-Zn-MCM41 and its catalytic performance in the hydroxylation of phenol

A series of Sn-Zn modified-MCM41 has been synthesized by direct hydrothermal method and characterized using ICP, XRD, TG/DTA, FT-IR, HRTEM and N_2-adsorption techniques. Catalytic performances of the obtained materials were evaluated in the hydroxylation of phenol with H₂O₂. Results indicated that all the samples exhibited typical hexagonal arrangement of mesoporous structure with high surface area and the heteroatoms were probably incorporated into the framework of MCM41. Catalytic tests revealed that the bimetallic incorporated materials were effective catalysts in the hydroxylation of phenol. The conversion of phenol could be reach to 56.8% for the catalysts with Sn: Zn: Si = 2.69: 4.57: 100 (molar ratio) under the optimized reaction conditions. Moreover, the materials containing Sn and Zn exhibited higher catalytic activity than monometallic Sn and Zn modified MCM41.     

气相法改性纳米二氧化硅表面

采用硅烷偶联剂A-151处理的纳米二氧化硅粒子，具有良好的疏水性，并且反应副产物没有腐蚀性，有利于保护设备和环境保护。分别用表面羟基数、亲油化度等性能来表征改性纳米二氧化硅的效果。红外光谱分析表明A-151确实已经和纳米二氧化硅表明的羟基发生了化学反应，通过透射电镜研究发现改性后纳米二氧化硅在乙醇中达到纳米级的分散。     

A new core–shell type fluorinated acrylic and siliconated polyurethane hybrid emulsion

A novel core–shell type fluorinated acrylic and siliconated polyurethane (FSiPUA) hybrid emulsion was prepared by seeded emulsion polymerization using siliconated polyurethane (SiPU) as a seed and forming the structure with SiPU as a shell and the copolymer of butyl acrylate (BA) with 2,2,2-trifluoroethylmethacrylate (TFEMA) as a core. SiPU was synthesized using isophorone diisocyanate (IPDI), polytetramethylene ether glycol (PTMG), polypropylene glycol (PPG), dihydroxybutyl-terminated polydimethylsiloxane (PDMS), dimethylol propionic acid (DMPA), 1,6-hexanediol (HDO) and triethylamine (TEA). The contents of siloxane and fluorine were determined according to the feed ratio. Fourier transform infrared spectroscopy (FTIR) was used to identify the chain structure of SiPU and FSiPUA. Investigation of transmission electron microscopy (TEM) confirmed the core–shell structure of FSiPUA emulsion and gave the particle size at about 50 nm. The measurement results of water contact angles and the solvent absorptions in water and n-octane for cured films showed that the water and the oil repellency for FSiPUA had been improved significantly with a suitable content of fluorine and siloxane.