一步法多单体反应挤出PP/PA6增容体系研究

采用一步法将接枝单体马来酸酐(MAH)和苯乙烯(St)、引发剂过氧化二异丙苯(DCP)与聚丙烯(PP)、尼龙6(PA6)、乙烯辛烯共聚物(POE)等混匀后在双螺杆挤出机中就地反应增容，详细地讨论了MAH／St／DCP用量和PA6含量对共混体系拉伸性能和冲击性能的影响；通过扫描电镜(SEM)分析了MAH／St／DCP用量及PA6含量对共混物的亚微形态、相界面的影响；通过红外光谱(FTIR)的结果分析对PP／PA6共混物增容反应机理进行了初步探讨。结果表明：一步法添加MAH／St／DCP引起PP／PA6共混体系发生了酰亚胺化反应，生成了Pp—(St—MAH)—PA6接枝共聚物有很好的增容作用；PA6与基体PP的界面非常模糊，分散相的颗粒也变得均匀细小，约0．5μm，大大改善了两相之间的粘结；从而使得PP／PA6共混体系的力学性能有了较大的提高，PA6质量分数在20％，MAH／St／DCP添加1～4份时效果最佳，缺口冲击强度提高2倍左右，拉伸强度、断裂伸长率、无缺口冲击强度也有明显改善。     

水性纳米复合铁钛防锈涂料的研制

以不同类型乳液作为基料，将纳米复合铁钛防锈颜料中WD—A型粉和WD—D型粉以一定的比例配合，发挥协同效果，提高防锈性能，制备出性价比合理、综合性能优良的水性防锈涂料。并重点分析了影响漆膜耐盐水和盐雾性能的各项因素。     

Structure and properties of collagen‐konjac glucomannan‐sodium alginate blend films

A new kind of blend film was made by mixing the solutions of collagen, konjac glucommnnan (KGM), and sodium alginate. The structure of the blend film was characterized by FTIR, XRD, atomic absorption spectrophotometer, and SEM, respectively. The effects of weight ratio between the polymers on light transmittance, tensile strength, elongation at break, water permeability, and water absorption of the film were studied. The results showed that there were strong interactions and good compatibility between collagen, KGM, and sodium alginate in the film. The film possesses good mechanical properties. Therefore, it can be applied in biomedicine as a new type of biomaterial. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007     

Synthesis and characterization of butan‐1‐ol modified toluene diisocyanate trimer

Butan‐1‐ol modified toluene diisocyanate tri mer (TDI‐trimer) was synthesized and characterized with Fourier transform infrared spectroscopy, gel permeation chromatography, and thermal gravimetry analysis techniques. The modified TDI‐trimer showed good dissolvable ability with hydroxy resin and can be used to produce paints with acrylic polyol resin. The thermal stability of the modified TDI‐trimer was improved by simply increasing both the amount of catalyst and the ratio of ? NCO/? OH, less depended on the kind of catalyst. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 4958–4962, 2006     

Preparation of HDPE/SEBS‐g‐MAH and its effect on mechanical properties of HDPE/wood flour composites

In this article, high density polyethylene/styrene‐ethylene‐butylene‐styrene block copolymer blends (HDPE/SEBS) grafted by maleic anhydride (HDPE/SEBS‐g‐MAH), which is an effective compatibilizer for HDPE/wood flour composites was prepared by means of torque rheometer with different contents of maleic anhydride (MAH). The experimental results indicated that MAH indeed grafted on HDPE/SEBS by FTIR analysis and the torque increased with increasing the content of maleic anhydride and dicumyl peroxide (DCP). Styrene may increase the graft reaction rate of MAH and HDPE/SEBS. When HDPE/SEBS MAH was added to HDPE/wood flour composites, tensile strength and flexural strength of composites can reach 25.9 and 34.8 MPa in comparison of 16.5 and 23.8 MPa (without HDPE/SEBS‐g‐MAH), increasing by 157 and 146%, respectively. Due to incorporation of thermoplastic elastomer in HDPE/SEBS‐g‐MAH, the Notched Izod impact strength reached 5.08 kJ m^?2, increasing by 145% in comparison of system without compatibilizer. That HDPE/SEBS‐g‐MAH improved the compatibility was also conformed by dynamic mechanical measurement. Scanning electron micrographs provided evidence for strong adhesion between wood flour and HDPE matrix with addition of HDPE/SEBS‐g‐MAH. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007     

Modification of oil palm empty fruit bunches with maleic anhydride: The effect on the tensile and dimensional stability properties of empty fruit bunch/polypropylene composites

Oil palm empty fruit bunch (EFB)‐filled polypropylene (PP) composites were produced. The EFB filler was chemically modified with maleic anhydride (MAH). The effects of the filler size and chemical modification of EFBs on the tensile and dimensional stability properties of EFB–PP composites were studied. The composites with MAH‐treated EFBs showed higher tensile strengths than those with untreated EFBs. This was attributed to the enhanced compatibility between the MAH‐treated EFBs and PP matrix, as shown in a scanning electron microscopy study. Fourier transform infrared analysis showed evidence of C?C and C?O bonds from MAH at 1630 and 1730 cm^?1, respectively. The MAH‐treated PP composites showed lower water absorption and thickness swelling than those with untreated EFBs. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 87: 827–835, 2003     

纯钨MIM黏结剂的优化及其流变性能

为了获得适合纯钨注射成形的黏结剂,通过热力学计算和喂料的流变实验,系统地研究了黏结剂组元的相容性和不同配方的蜡基黏结剂的流变性能,分析了多种因素对喂料黏度的影响,综合评价了不同黏结剂构成的喂料的流变性能,并对喂料进行了SEM观察,结果表明：所选用的黏结剂体系中各组元之间有很好的相容性,当PW与其他组元的质量比大于4时,表现为热力学相容性;由60%PW-10%HDPE-12%PS-13%PP-5%SA组成的黏结剂的流变性能最好,其综合模塑性指数为7.07 m2/N.s.K,SEM结果显示其喂料相当均匀.     

New CFD Validation Method with Application to Verify Computations of Near Wall Flows

For high Re number flows, a new computational fluid dynamics (CFD) validation method, namely, wall-surface compatibility criteria method and also called Gaos criteria, is proposed to verify near wall flows. As examples, Gaos criteria method and other two CFD verification methods (analytic solutions method and grid convergence analysis) are used to verify FLUENTs near wall flows solutions for two-dimensional incompressible laminar stagnation-point flows. The exact solution of the Navier-Stokes equations for laminar stagnation-point flows satisfy accurately all Gaos criteria, numerical simulations of laminar stagnation-point flows show that when physical parameters (the pressure coefficient and the Stanton number at wall surface) achieve convergence with more and more fine-screen grid, a part of Gaos criteria are not satisfied.     

中印贸易互补性实证分析

以比较优势理论和产业内贸易理论为依据,利用近58来的贸易统计数据,计算显示比较优势、Brulhart指标、贸易特化系数（TSC）的测度指数值及其变动趋势．分析结果表明,中印两国具有很强的产业间贸易互补性,但产业内贸易互补性不强,推动中印贸易的主要是产业间贸易,产业内贸易所占比重较少,并预测出中印贸易互补性有增强趋势．     

多功能吉赫兹横电磁波小室设计

目前一般的GTEM(吉赫兹横电磁波)小室大都用于EMS(电磁抗扰度)测试,而针对于EMI(电磁干扰)测试的尚不多见.介绍了一种既可用于EMS测试又可用于EMI测试,且还可用于高频电路辐射机理诊断的多功能GTEM小室,给出了该GTEM小室的结构设计方法和测量原理,阐述了利用该GTEM进行高频电路辐射机理诊断的实现方法.GTEM小室设计方案采用的是多极矩模型实现,可将近场测量结果转换为标准远场测量结果(如电波暗室或开域场).此外,利用该GTEM小室以及近场电磁场探头和频谱分析仪对被测设备进行近场测量,即可得出被测设备的辐射机理测量结果.