高导电镀银玻璃微珠/硅橡胶复合材料的结构与性能

探讨了镀银玻璃微珠(SGB)的表面改性、粒径和用量对SGB甲/基乙烯基硅橡胶(VMQ)复合材料的导电性能、力学性能及相态结构的影响,考察了SGB/VMQ复合材料导电网络的影响因素。结果表明,采用硅烷偶联剂改性SGB,可以改善SGB/VMQ复合材料的力学性能和加工性能,其中使用乙烯基三乙酰氧基硅烷(牌号为A-151)还能使其导电性能保持不变。SGB的粒径越大,用量越多,SGB/VMQ复合材料的导电性能越好,当其粒径为41μm、用量300份时,填充的VMQ具有优良的力学性能和导电性能。在满足形成导电通路的前提下,应尽可能地减少SGB的用量,以改善材料的力学性能。     

Photopolymerization of HEMA/DEGDMA hydrogels in solution

Photopolymerization is a widely used technique to synthesize polymers and hydrogels. The commonly used ultraviolet (UV)-curable mono-, di- or multifunctional vinylated monomers are often volatile, causing difficulty in kinetics analysis such as photo-differential scanning calorimetry (PhotoDSC). In this work, the DSC sample pan is chemically and physically modified such that the resin can be placed uniformly in the sample pan with minimum sample weight loss during measurement. This approach substantially improved experimental accuracy, which in turn provides a better understanding of the reaction kinetics of UV-curable polymers. Kinetic experiments were carried out for poly(2-hydroxyethyl methacrylate) (HEMA)-based hydrogels. The effects of light intensity and water concentration on the reaction kinetics and rheological change was investigated. It was found that increasing the light intensity enhances the polymerization, but too high an intensity slows down the reaction at the later stage. The addition of solvent and high light intensity facilitates the cyclization, delaying macrogelation. The viscosity rise of the resin system and the formed polymer size were also measured using a photorheometer and a particle size analyzer, respectively. The measured gel time, gel conversion and polymer size distribution agree with the kinetic analysis.     

苯甲醇制造方法

阐述了苯甲醇的各种制造方法和国内外发展趋势，指出甲苯氧化制苯甲酸时，副产10%～15%(wt)苯甲醇，分离精制，是一种有重大工业潜力的方法。还提到了“绿色化学”合成路线，指出了各种路线的优缺点。     

聚丙烯腈增强纤维对腻子性能的影响

制备了不同配方的聚丙烯腈纤维增强腻子,参照相应的标准对腻子的抗裂、抗冲击和抗渗性能进行了表征。试验结果表明,纤维的应用有效地改善了腻子的上述性能。纤维在腻子中的临界长度为2mm。此外,纤维增强腻子展现出了更好的施工性能。KNP192聚丙烯腈纤维的最佳添加量为腻子粉质量的0.3%～0.4%。     

Oxidative stability of soybean oil fatty acid methyl esters by oil stability index (OSI)

Biodiesel, an alternative diesel fuel derived from transesterification of vegetable oils or animal fats, is composed of saturated and unsaturated long-chain FA alkyl esters. During long-term storage, oxidation caused by contact with air (autoxidation) presents a legitimate concern with respect to monitoring and maintaining fuel quality. Extensive oxidative degradation may compromise quality by adversely affecting kinematic viscosity, acid value, or PV. This work examines the oil stability index (OSI) as a parameter for monitoring the oxidative stability of soybean oil FAME (SME). SME samples from five separate sources and with varying storage and handling histories were analyzed for OSI at 60°C using an oxidative stability instrument. Results showed that OSI may be used to measure relative oxidative stability of SME samples as well as to differentiate between samples from different producers. Although addition of α-tocopherol or TBHQ increased OSI, responses to these antioxidants varied with respect to SME sample. Variations in response to added antioxidant were attributed to aging and other effects that may have caused oxidative degradation in samples prior to acquisition for this study. Results showed that OSI was more sensitive than iodine value in detecting the effects of oxidative degradation in its early stages when monitoring SME during storage.     

辊道窑烧嘴喷射角度对窑内湍流气流影响的研究

应用k -ε两方程湍流模型 ,对辊道窑烧成带的湍流旋流流动进行了理论分析 ,并用计算流体力学软件Fluent进行数值模拟 ,研究了烧嘴的喷射角度对烧成带内的湍流旋流流动的影响及其对制品烧成的作用     

二种双邻位甲基取代的聚芳醚酮类树脂的合成与性能

合成二种双邻位甲基取代的聚芳醚酮类聚合物,聚芳醚酮醚酮酮(DM-PEKEKK)和聚芳醚酮酮醚酮酮(DM-PEKKEKK),用FT-IR、1H NMR、DSC、WAXD、TG等技术对其进行表征,研究表明:较之于未取代的PEKEKK和PEKKEKK玻璃化转变温度和溶解性能大幅度提高,热分解温度有所下降,但均在450℃以上.     

Effect of coal filler on the properties of soy protein plastics

The influence of ultrafine coal filler (UFC) content on tensile properties, water absorption, and biodegradability of soy protein plastics were investigated. The addition of UFC in the soy protein plastics, with different content of glycerol as a plasticizer, was at different ratio varying from 10:0 to 6:4. Blend sheets of the soy protein composites were prepared by the compression molding processing. The results show that, with 23.08 wt % glycerol, the tensile strength and elongation at break for the soy protein sheet with coal filler (range from 5 to 30 parts) can be enhanced as compared with nonfilled soy protein plastics. Water resistance of the soy protein plastics improves with the increase in UFC content. The derivative thermogravimetry (DTG) curves indicate a double‐stage degradation process for defatted soy flour (SPF), while three‐stage degradation process for soy plastics and the soy protein composites. FT‐IR, XPS, and SEM were applied to study the interfacial interaction between coal macromolecules and soy protein molecules in UFC filled soy protein plastics. The results demonstrated that there is strong interfacial interaction in the soy protein plastics caused by the compression molding processing. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 3134–3143, 2006     

耐腐蚀性乙烯基酯树脂的研究与应用

论述了乙烯基酯树脂优异的耐腐蚀性能,耐腐蚀原理及目前国内外耐腐蚀性乙烯基酯树脂的研究进展和在一些领域的典型应用。     

用于光纤并带的UV固化胶粘剂性能的研究

研究了用于光纤带的紫外光固化胶粘剂的剥离性、柔韧性、拉伸强度和延伸率的影响因素。