丁腈橡胶/导电粒子复合材料的正温度系数(PTC)特性

将导电粒子碳黑和铜粉分别与丁腈橡胶混合制备导电聚合物复合材料，其中碳黑（Ｎ５５０）／丁腈橡胶复合材料的电阻率随温度的变化呈现较强的正温度系数（ＰＴＣ）效应。讨论了掺入导电粒子浓度、结构和表面性质以及混炼硫化工艺等对该类材料的室温电阻率及ＰＴＣ效应的影响。     

HIPS/EVA/CB体系的相容性

研究了炭黑(CB)对高抗冲聚苯乙烯(HIPS)/乙烯-乙酸乙烯酯共聚物(EVA)共混体系相容性的影响,并预测了共混体系的相形态转变点。填充CB后,当EVA用量大于50 phr时,碳氧双键伸缩振动峰的位置由1 737.9cm~(-1)偏移到1 706.5 cm~(-1)附近,且在1 240.0 cm~(-1)附近的碳氧单键峰减弱,近乎消失。采用半经验公式对共混体系进行理论预测,HIPS/EVA/CB共混体系理论上发生相形态转变时,HIPS的临界质量分数为50%～60%,经傅里叶变换红外光谱和扫描电子显微镜照片分析,共混体系发生相形态转变时,HIPS的质量分数约为42%。     

超微细Al_2O_3与PMMA溶液复合技术的研究

利用溶液复合技术制备了超微细Ａｌ２Ｏ３粒子与聚甲基丙烯酸甲酯（ＰＭＭＡ）的复合材料。ＳＥＭ证示采用乙酸乙酯作溶剂，可以将超微细Ａｌ２Ｏ３很好地分散于ＰＭＭＡ基体中，力学性能测试结果表明超微细Ａｌ２Ｏ３对ＰＭ－ＭＡ具有很好的增韧增强作用，当Ａｌ２Ｏ３用量为１０％，粒子半径为０．０５μｍ时，ＰＭＭＡ的拉伸强度增加３倍，缺口冲击强度增加了１０倍。差热分析结果说明超微细Ａｌ２Ｏ３加入ＰＭＭＡ后，提高了ＰＭＭＡ的热分解温度，降低了Ａｌ２Ｏ３的相转变温度，预示超微细Ａｌ２Ｏ３与ＰＭＭＡ可能发生了化学结合。     

PROMOTER FLOW ACTION OF SOLID-STATE LOW MELT POINT METAL ON THE POLYPROPYLENE

With the aid of a slip-disentanglement theo-ry,a reological equation has been deduced about the compos-ite system of solid-state low melting point metal and poly-mer. By measuring some rheological properties of the compos-ite system composed of low melt point metal and polypropy-lene (LMPM/PP),the results show that LMPM has a pro-moter flow action upon PP when using a small amount ofLMPM and , if some coupled agents are added,the promoterflow action will be remarkable. Moreover, while LMPM beingadded into the composite,the temperature sensitivity of systemwill go up. This indicates that the system’s viscosity will dropfurther if its temperature is increased.     

Structure, Infrared Radiation Properties and Mssbauer Spectroscopic Investigations of Co_(0.6)Zn_(0.4)Ni_xFe_(2-x)O_4 Ceramics

Ferrite compound Co0.6Zn0.4NixFe2-xO4 was synthesized by solid state reaction. The structure and performance of Co0.6Zn0.4NixFe2-xO4 compounds were studied by Mssbauer spectroscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and infrared radiant tester. Mssbauer spectroscopy and XPS analysis show the valence states and distribution of cations in Co0.6Zn0.4NixFe2-xO4. Zn2+ has invariably shown preference for the tetrahedral sites, and Ni2+ has the preference for the octahedral sites. T...     

MODIFICATION OF FLAKE REINFORCED FRICTION BRAKE COMPOSITE MATERIAL

According to the recent development trend and need of the friction brake material, the flake reinforced friction brake material has been made out by adjusting the recipe and techniques.The two-dimensional flake vermiculite is selected as the reinforced stuffing of the material; the modified resin is used as the basal bed of the material.The tests manifest that the properties of mechanics are high, the friction coefficients are suitable and stable,and especially in high temperatures the wear is low.It is an excellent friction brake material.     

炭黑表面接枝改性

综述炭黑表面接枝聚合改性及表征方法，着重介绍自由基接枝、阳离子接枝及阴离子接枝等三种方法。     

A STUDY OF THE STRUCTURAL LAYERS OF COUPLING AGENTS AND THE MICROSCOPIC RHEOLOGY IN THE INTERFACES OF GF/UP SYSTEMS

The coupling agents content and thickness on glassfiber (GF) surfaces which have been treated with silanesand titanates under different conditions are tested bymeans of XRF (X-Ray Fluorescent spectrometry). And therheological characteristics of the dispersed systemsprepared from the above glass fibers combined withunsaturated polyester resin (UP) are discussed. Theresults show that the rigidity of the internal layers ofsilane coupling agent absorbed by glass surfaces isgreater than the one of the external layers; while theeffect of the titanate coupling agents on the rheolo-gical characteristics of the system is approximatelythe same in each structural layer, that is due to thefact that both the internal and external layers oftitanates on glass surfaces have the similar flexiblestructures.     

巯基胺型螯合树脂的合成及其吸附性能研究

本文合成了一系列新的巯基胺型树脂,并测定了它们对Au(Ⅲ)、Ag(Ⅰ)、Hg(Ⅱ)、Cu(Ⅱ)、Mn(Ⅱ)、Zn(Ⅱ)和Pb(Ⅱ)等金属离子的吸附性能。结果表明,这些树脂对贵金属离子具有良好的吸附性能,其中对Au(Ⅲ)的吸附容量可达1.97g金/g树脂。在Au(Ⅲ)-Cu(Ⅱ)-Zn(Ⅱ)-Mg(Ⅱ)和Ag(Ⅰ)-Cu(Ⅱ)-Zn(Ⅱ)-Pb(Ⅱ)混合溶液中,该树脂只分别吸附Au(Ⅲ)和Ag(Ⅰ),而几乎不吸附其它金属离子,显示出良好的吸附选择性。     

导电SBS/SBR复合材料的研究

本文研究了碳黑填充ＳＢＳ／ＳＢＲ复合材料的基本电性能，对复合材料电阻率随温度的变化特性进行了详细研究。讨论了碳黑种类、结构和性质、填充浓度以及ＳＢＳ含量对复合材料电阻率和电阻——温度特性的影响。实验结果指出，碳黑（Ｎ５５０）／ＳＢＳ／ＳＢＲ（ＳＢＳＳＢＲ＝１１ｗｔ）复合材料的电阻率随温度的变化呈一定强度的正温度系数（ＰＴＣ）效应。