熔模铸造型壳抗弯弹性模量的研究

依据材料力学、陶瓷材料的有关理论和方法,分别对水玻璃型壳、硅溶胶型壳及其复合型壳在不同温度时的抗弯弹性模量进行了测试研究.结果表明,耐火材料、温度对型壳的弹性模量有较大的影响,硅溶胶型壳和复合型壳的弹性模量值比水玻璃型壳的大.     

EPS模陶瓷型精密铸造失模工艺研究

针对EPS陶瓷壳型精铸失模时容易裂壳的现象,对EPS消失模精密铸造工艺进行了研究。利用自制的膨胀率检测设备对不同密度的EPS模试样在不同加热温度下的最大膨胀率进行了测试,研究了壳型膨胀与失模温度之间的关系;对陶瓷壳型中EPS模失模时的温度场分布进行测量,发现EPS模试样的密度大小对失模时温度场有着很重要的影响。在试验和分析的基础上,对EPS模失模机制进行了探讨,提出了高温失模机制。高温失模有利于降低失模时对壳型的膨胀作用力,为获得洁净而健全的陶瓷型壳提供了可靠保证。     

石墨的球状生长--球墨铸铁基础理论的最新发展(二)

球形晶体的结晶学条件要求雏晶必须有大量辐射对称的小角分枝;此外,这些小角度分枝应具备“规则分枝”特征（即相同的生长习性与生长速度）。在众多球化理论中,缺陷生长理论较符合球形晶结晶学原理,而石墨的缺陷生长与溶液结晶时的过冷有密切关系,化学成分、冷却速度等工艺因素都通过动力过冷、成分过冷、热学过冷影响石墨螺型缺陷决定最终生长成的石墨形状。对石墨球在奥氏体晕圈（壳）包围下生长过程进行了研究。用彩色金相方法揭示出奥氏体壳的形成过程并将奥氏体壳分为快封闭、慢封闭、不封闭三种类型,讨论了它们与石墨畸变的关系。快封闭的奥氏体壳保证得到圆整的石墨球,慢封闭与不封闭都使石墨形成畸形。     

CAE技术在铸造模具工艺优化中的应用

采用华铸CAE软件对铝合金壳体铸件的金属型铸造过程进行了数值模拟，通过对几种铸造模具工艺方案的数值模拟和实验,优选出了一种最佳的铸造工艺用于生产，成功地消除了壳体铸件生产过程的缩孔、缩松缺陷。模拟结果与实际生产中的情况吻合较好。结果表明：CAE技术能为工艺方案的评价和改进提供科学的依据，能缩短新产品的开发周期，为企业带来了显著的经济效益。     

芯壳乳液胶粘剂的研究

介绍乙酸乙烯酯－丙烯酸丁酯－丙烯酸芯结构乳液的制备方法，并将它们的性能与均匀共聚乳液作了测试与比较。     

核壳型二氧化钛复合纳米材料研究进展

核壳材料由中心核和外部壳层组成，因其组成、大小、结构的不同，性能优于普通材料。二氧化钛具有优异的光、电和化学等特性可作为理想的核壳材料。从二氧化钛作为核壳型复合纳米材料的核、壳及核壳结构的载体3个方面出发，介绍了核壳型结构的二氧化钛复合纳米材料的分类、制备、性质及应用概况，并对其发展前景及存在问题进行了简要概述。     

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.     

皮革涂料用丙烯酸酯核-壳乳液的研制

采用种子乳液聚合法，以交联型软性聚合物为核，交联型硬性高聚物为壳，合成了具有优异耐寒性及高温抗回粘性聚合物。讨论了乳化剂种类及应用、核／壳比等对聚合物性能的影响。     

(Ag)_核·(Au)_壳复合纳米粒子的制备

以银原子团簇作晶种,采用微波高压液相合成法制备了分散性好、规则球形的(Ag)核·(Au)壳复合纳米粒子。研究了(Ag)核·(Au)壳复合纳米粒子的紫外可见吸收光谱和共振散射光谱特性。结果表明,液相(Ag)核·(Au)壳复合纳米粒子和高压微波合成的液相金纳米粒子的最强共振散射峰均在580nm处,它们的吸收光谱图相似,最大吸收分别在518.5nm和524.8nm。     

Swelling kinetics of a hydrogel of poly(ethylene glycol) and poly(acrylamide‐co‐styrene)

A hydrogel incorporating the hydrophilic polymer poly(ethylene glycol) and a copolymer of acrylamide and styrene was synthesized, and the dynamics of the water‐sorption process were studied. The effects of the composition of the hydrogel and the temperature of the swelling medium were investigated with respect to the water‐sorption characteristics of the hydrogel, and the kinetic parameters, including the swelling exponent and diffusion constant, were evaluated. The hydrogel was also judged for the antithrombogenic property of its surface. The experimental findings were explained on the basis of the core–shell polymeric structure of the hydrogel. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 85: 1419–1428, 2002