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详细论述了国内外汽车橡胶制品的发展现状与趋势,介绍新材料的应用和新标准实施对其影响,着重就我国汽车橡胶制品产业的状况、技术水平、企业情况、分类情况、未来发展进行介绍,并提出了发展建议。 相似文献
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阐述了2013年上半年我国氧化铁颜料行业的经济运行情况,对氧化铁行业上半年上下游产业发展态势、氧化铁颜料进出口情况、国内市场行情、城镇化建设对其的影响以及整合与改造现状进行了分析,并归总介绍了2013年上半年内已动工的氧化铁颜料新建项目。 相似文献
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对PVC冲击改性剂——MBS、CPE和ACR的分子组成和分子结构进行了分析,研究了其抗冲改性机理及对PVC制品低温冲击强度、耐候性、维卡软化点、韧性的影响。从高分子热力学的角度分析了CPE和ACR在PVC中分散所形成的制品结构。指明了传统ACR和CPE在PVC改性中所存在的优缺点。在此基础上分析了理想冲击改性剂ACR应具有的结构特点,并设计和开发了新型冲击改性剂ACRHL-56和HL-58,通过试验对其性能与传统冲击改性剂ACR和CPE进行了比较,发现其性能远优于后者。 相似文献
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溶液共混法制备聚氨酯/碳纳米管复合材料及其性能 总被引:3,自引:1,他引:2
通过强酸处理方法对碳纳米管进行改性处理并对其结构和分散稳定性进行分析。采用溶液共混法制备了聚氨
酯/碳纳米管复合材料,利用FTIR对其结构进行了分析,探讨了碳纳米管对复合材料力学性能、热稳定性能以及弹
性回复率的影响。结果表明,碳纳米管经酸处理后添加了羧酸活性基团,提高了其在溶剂中的分散性|在复合材料
中,碳纳米管以较强氢键与大分子连接,复合材料的力学性能和热稳定性能都有所提高,而弹性回复率没有受到很
大影响。 相似文献
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聚氨酯/碳纳米管复合材料的制备及其性能研究 总被引:2,自引:0,他引:2
通过强碱球磨方法对多壁碳纳米管(MWCNTs)进行了改性处理,并对其化学结构和微观形态进行了分析.采用溶液共混法制备了聚氨酯(PUR)/MWCNTs复合材料.利用扫描电子显微镜、傅立叶变换红外光谱仪对其进行了表征.探讨了MWCNTs对PUR/MWCNTs复合材料力学性能、热稳定性以及电导率的影响.结果表明,MWCNTs... 相似文献
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Performance of Dowel-Welded L-joints for Wood Furniture 总被引:1,自引:0,他引:1
《Journal of Adhesion Science and Technology》2013,27(15):1829-1837
Rotationally welded wood dowels were used to hold together step butt and mortise and tenon L-joints and these joints were tested against European Norms for these types of joints. A factorial experiment was carried out in which (1) these two types of joints were tested, (2) 4 or 6 dowels per joint were used, (3) dowels were inserted at either 45° or 90° to the surface of the wood, (4) two types of wood were used, beech and European ash, and (5) two types of tests were carried out, namely compression and tension tests. The strength results were used to find out which of these were the most important individual parameters and their interactions, namely type of joint, number of dowels, and type of test. The strength results were well in excess of the relevant L-joints standard specifications for wooden windows. 相似文献
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Lisia Lorea Valente Isabella Schönhofen Manso Eliseu Aldrighi Münchow 《Journal of Adhesion Science and Technology》2013,27(7):806-815
The aim of this study was to prepare experimental resin-based primers with varied components (silane – S, polyacrylic acid – PA, or methacrylic acid – MA) and evaluate their repair bonding ability to resin composite. Primers were prepared containing methacrylate monomers, acidic monomer, ethanol, photoinitiators and 0, 10, or 20 wt% of S, PA, or MA. Degree of C=C conversion and pH were measured. Composite blocks (Opallis, FGM) were aged by 5000 thermal cycles and composite cylinders (repairs) were built up on their surfaces. The cylinders were tested under shear stress after 24 h. Failure modes were classified under magnification. Data were statistically analyzed at α = 0.05. Primers containing MA were the most acidic compositions, whereas S-containing primers were less acidic. Incorporation of 20 wt% of the varied components decreased C=C conversion. PA-based primers had higher C=C conversion than MA-based materials. Repair bond strength results were dependent on the component added and its concentration. MA-based primers presented higher bond strength than primers containing PA. Cohesive failures within composite were predominant for S-based primers, whereas mixed failures were more prevalent for PA-based primers. In conclusion, the overall best repair abilities were observed for primers containing 10 wt% of the components tested. 相似文献
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采用嵌入式CFPR筋和外贴碳/玄武岩纤维混杂布加固混凝土梁,设计比较了对加固材料施加预应力后的增强效果,共进行了6根梁的4点弯曲试验,并就计算结果和试验结果进行了验证,提出了设计方法.结果表明:相比于无预应力加固,施加预应力后能够进一步提升梁的开裂荷载和屈服荷载,并提高梁的服役性能.计算结果和试验结果比较吻合. 相似文献