基于纳米粒子改性塑料性能的研究

综述了纳米粒子改性塑料的主要方法和研究进展,总结了纳米粒子改性塑料的力学性能、摩擦学性能、电学性能、阻隔性能、生物学性能、流变性能和加工性能的国内外研究现状,并指出了纳米粒子改性塑料的研究方向。     

芳纶Ⅲ单向复合材料制备及性能研究

用湿法缠绕法制备了芳纶Ⅲ-环氧树脂单向复合材料,对其拉伸性能、压缩性能、弯曲性能及层间剪切性能进行了研究,并对比了Kelvar-49、芳纶1414单向复合材料的相关性能。试验结果表明:含有杂环结构的芳纶Ⅲ不仅基本力学性能较优,其单向复合材料的拉伸性能、压缩性能、层间剪切性能都优于不含有杂环结构的Kelvar-49和芳纶1414,尤其体现在拉伸性能上。     

PET/ECDP/PEG共混改性聚酯纤维的研究

研究了PET ECDP PEG共混改性聚酯切片的热性能、结晶性能、流变性能 ,并对经高速纺丝制得的共混改性聚酯纤维的力学性能、染色性能、吸湿性能及抗静电性能进行了测定。     

天然橡胶与氯丁橡胶并用性能的研究

研究了天然橡胶与氯丁橡胶并用比例对硫化特性、力学性能、老化性能以及屈挠性能的影响,结果表明:天然橡胶改善了氯丁橡胶的加工性能,氯丁橡胶提高了天然橡胶的耐热空气老化性能以及耐臭氧老化性能,耐曲挠性能也有所改善.     

T-ZnO/RPUF复合材料力学性能的研究

实验制备了四针状氧化锌（T-ZnO）晶须/硬质聚氨酯泡沫塑料（RPUF）复合材料,研究了复合材料的拉伸性能、压缩性能、冲击性能和阻尼减振性能,并用扫描电子显微镜（SEM）研究了该复合材料的内部形态.结果表明,T-ZnO不能提高复合材料的拉伸性能、压缩性能和冲击性能,但可以提高材料在玻璃态的阻尼性能.     

硼酚醛树脂及其复合材料的研究进展

作为目前最成功的改性酚醛树脂品种之一,硼酚醛树脂具有优异的耐热性能和耐烧蚀性能,良好的力学性能、摩擦性能和阻燃性能等。硼酚醛树脂及其复合材料可广泛应用于航空航天、武器装备、汽车制动、防火阻燃等领域。对硼酚醛树脂及其复合材料的研究进展进行了综述。首先概述了硼酚醛树脂的不同制备方法及硼酚醛树脂的改性途径;然后重点总结了硼酚醛树脂基复合材料的常用制备方法及其耐热性能、耐烧蚀性能、力学性能、摩擦性能、阻燃性能、耐水性能;最后,对该领域所存在的问题进行了总结,并展望了其发展趋势。     

甲基乙烯基硅橡胶的研究进展

综述了甲基乙烯基硅橡胶(MVQ)的力学性能、电性能、导热性能、耐热性能、阻燃性能、耐辐射性能、压缩永久变形性能等方面主要的研究和改性进展,研究了甲基乙烯基硅橡胶加工改性工艺对材料多项性能的影响变化规律,解决了研发新材料的基本思路与开发新性能等基本问题。     

BOPP烟膜的性能及应用研究

本文简述了BOPP烟用薄膜的各项性能,主要包括滑动性能、抗静电性能、挺度、热封性能、光学性能,分析了它们在香烟包装过程中的应用,为广大同行生产和使用BOPP烟用薄膜提供参考。     

Therban®HNBR系列专题讲座(四)Therban®HNBR与其他橡胶性能之对比(Ⅰ)

文中介绍了Therban HNBR的性能,并分别与其它橡胶的耐热、耐油性能、动态曲挠性能、低温性能等进行了详细的比较.     

Therban HNBR与其他橡胶性能之对比(I)

文中介绍了Therban HNBR的性能,并分别与其它橡胶的耐热、耐油性能、动态曲挠性能、低温性能等进行了详细的比较。     

聚氨酯/纳米氧化锌复合材料研究进展

综述了聚氨酯/纳米氧化锌复合材料的制备方法及研究进展。介绍了纳米氧化锌复合材料力学性能、抗静电性能、紫外屏蔽性能、耐磨与抗腐蚀性能和阻尼减振性能及应用。指出聚氨酯/纳米氧化锌复合材料存在的问题及发展方向。     

Effect of processing conditions on the structure and properties of polypropylene spunbond fabrics

The structure and properties of a spunbond fabric are determined by numerous process variables. The development of fiber morphology is influenced and controlled by extrusion and quenching conditions. The properties of the fabric are the result of the properties of the filaments, their arrangement in the web, and the bonding conditions. It is therefore critical to understand the relationship between the process conditions and the properties of the fabrics produced. This study was conducted to investigate the effects of some of the important process variables on the structure and properties of the filaments and ultimately on that of the fabrics. Process variables such as polymer throughput rate, cooling and suction air speed, web basis weight, and bonding temperature were investigated. Filament samples were collected before bonding and were analyzed for various properties such as crystallinity, crystallite size, birefringence, density, thermomechanical stability, and tensile properties. The fabric samples were analyzed for tensile properties, tear strength, stiffness, and crystallinity. Ruptured strips obtained from the tensile test were observed with a scanning electron microscope to understand the failure mechanism. The results were statistically analyzed to evaluate the effect of process variables on the properties and to predict the properties for different process conditions. The findings are helpful in determining the optimum processing conditions so as to achieve the desired properties. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 98: 2355–2364, 2005     

丁羟型聚氨酯弹性体力学性能研究

研究了以不同分子质量的丁羟（HTPB）、二异氰酸酯和固化剂为主要原料制备的PU弹性体的力学性能。结果表明,PU弹性体的力学性能随丁羟相对分子质量的增大而提高;R（n-NCO／n-OH）值达到8时,PU的力学性能最佳;用4种固化剂固化PU弹性体,结果表明复配的固化剂固化的PU弹性体力学性能最好;固化温度越高、时间越长,PU弹性体的力学性能越好。     

溶胶-凝胶法制备纳米二氧化钛及其对苯酚的光催化性能研究

以钛酸丁酯为原料,用溶胶-凝胶(Sol-gel)法制备了纳米TiO2粉末。采用透射电子显微镜和X光衍射仪对粉体的粒径、物相、形貌和热稳定性进行了表征。通过粉体对苯酚的降解情况对其光催化活性进行了测试,结果表明TiO2具有良好的光催化氧化性能。     

Microstructure dependent properties of polypropylene‐clay nanocomposites

The mechanical properties of melt processed polypropylene‐montmorillonite nanocomposites were studied as a function of clay content. The measurement of tensile properties at room temperature and dynamic mechanical properties over a wide temperature range reveal a decrease in modulus and tensile strength of the composite with increasing clay content. The origins of this anomalous result were examined in detail using X‐ray diffraction and differential scanning calorimeter, which averaged the microstructure over reasonable specimen volumes. Micromechanical models could be used to adequately describe the composite properties, provided appropriate properties for the matrix and particle were used. The matrix properties were found to affect the average properties significantly. © Wiley Periodicals, Inc. J Appl Polym Sci 103: 204–210, 2007     

Parylene薄膜紫外光老化的研究进展

简要介绍了Parylene薄膜的优异性能以及主要应用范围。综述了国内外对Parylene薄膜在紫外光照射条件下老化行为的最新研究进展。讨论了紫外光老化的机理、主要现象、产物,以及老化对Parylene薄膜光学性能、透湿透气性能、力学性能、电磁学性能的影响。     

空心玻璃微珠对碳纤维增强聚丙烯性能的影响研究

以碳纤维(CF)增强聚丙烯(PP)作为基础材料,添加空心玻璃微珠(GB)对其进行共混改性,研究GB的加入量对其流动性能和力学性能的影响。转矩流变性能、拉伸性能、冲击性能和微观形貌的分析与研究结果表明,GB对PP/CF复合材料具有增强增韧的作用。     

Magnetic properties of iron alloys

The purpose of this work was to compare the properties of high purity atomized iron powder compacts with conventional high purity irons and to show the effects of porosity on magnetic properties. It was found that if powders were hot repressed so that no porosity was present, the magnetic properties were as good as or better than conventional high purity irons, depending on the sintering conditions employed. Intrinsic properties were similar because the amount of iron available to magnetize was equivalent. Structure-sensitive properties depended on the grain size. If the compacts were sintered above the delta transition temperature, these properties were equivalent to the purest of the conventional high purity irons. As the compacts became less dense and more porosity was present, induction and remanent magnetization decreased linearly with density; resistivity increased. In the case of structure-sensitive properties, porosity restricted grain growth. Small, closely spaced pores caused the greatest degradation of properties. Equations were derived through regression analyses and were found to explain more than 90% of the data. The intrinsic properties: induction, remanent magnetization, and resistivity were all linear functions of the density. The maximum permeability and the coercive force were power functions of the mean grain size intercept. These equations provide a basis for design of magnetic components using P/M compacts. If the properties that are desired are known, the density or the grain size required may be calculated. From this, the powder and the processing conditions required can be established to provide the desired properties.     

碳纳米管改性方法对其与聚氨酯的复合材料性能的影响

通过强酸回流、强碱球磨方法分别对碳纳米管进行了改性处理,采用溶液共混法制备了聚氨酯/碳纳米管复合材料。探讨了碳纳米管改性方法对复合材料的化学结构、微观形态、力学性能、热稳定性能以及导电性能的影响。结果表明,在聚氨酯基体中添加经化学改性处理的碳纳米管使复合材料的氢键增多,力学性能、热稳定性和导电性能都得到了提高。聚氨酯/强碱球磨处理碳纳米管复合材料中的氢键数目更多,综合性能也更优异,而且碳纳米管在聚氨酯基体中的分散更均匀。     

超支化聚合物接枝纳米TiO_2/环氧树脂复合材料的制备与表征

利用偶联剂KH-550和超支化聚(胺-酯)(HBP)对纳米TiO2进行改性,并制备了纳米TiO2/环氧树脂(EP)复合材料。对复合材料的结构、力学性能、加工性能以及热性能进行了研究。研究结果表明,HBP接枝改性纳米TiO2(TiO2-g-HBP)的引入可明显提高复合材料的力学性能、热性能及加工性能;当w(TiO2-g-HBP)=1%时,复合材料的力学性能最好,其冲击强度和弯曲强度比纯EP分别提高了135.51%和22.98%;扫描电镜(SEM)结果显示,TiO2-g-HBP/EP复合材料由脆性断裂转变为韧性断裂。