共查询到19条相似文献,搜索用时 156 毫秒
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Jeffery S.Downey Constantine W.Tsimpris Andrew L.Pollar Chloe F.Wilson Jocelyn Willis-Papi Christiane K.Hohenwarter Qin Lin 黎学东 《轮胎工业》2012,32(7):417-422
研究Kevlar对位芳纶浆粕和精切短纤维对天然橡胶胶料的补强效果。结果表明:随着纤维用量的增大,Kevlar对位芳纶浆粕补强的胶料储能模量增加幅度大于损耗模量增加幅度,损耗角和损耗因子随着浆粕用量的增大而降低,这种效果有利于低滚动阻力轮胎或其他轮胎部件的胶料配方设计,在提高胶料定伸模量的同时不会增加滞后生热;Kevlar对位芳纶浆粕表现出的一种独特手风琴效应可能是低滞后生热的原因。 相似文献
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以甲基乙烯基硅橡胶(MVQ)为基质、氧化铝为填料,研究了氧化铝的粒径、填充量及表面处理方式对复合材料动态力学性能和拉伸性能的影响。结果表明,在高温段氧化铝粒径对MVQ复合材料储能模量的影响不大,但大粒径的氧化铝有利于提高其损耗因子,而小粒径填料的加入可以拓宽其阻尼温域。随着氧化铝填充量的增加,MVQ复合材料的损耗因子和储能模量均增大,而拉伸强度和扯断伸长率有所下降。与用偶联剂处理的氧化铝相比,吡咯聚合物包覆的氧化铝可以同时提高MVQ复合体系的损耗因子和储能模量,并拓宽阻尼温域,其拉伸强度略有下降,但扯断伸长率的变化不大。 相似文献
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通过密炼共混的方式制得白炭黑/硅土并用的热硫化硅橡胶复合材料。研究了白炭黑/硅土并用比对硅橡胶的硫化特性、应变扫描特性、力学性能和阻尼性能的影响。结果表明,硅土用量增加可显著延长硫化时间,降低硅橡胶的交联密度;同时,填料网络结构变弱,结构化效应减弱。邵尔A硬度、定伸应力和撕裂强度随着填料并用比减小而降低,拉伸强度和拉断伸长率随着硅土用量增加先增大而后降低,并分别在加入5份和15份硅土时出现最大值;压缩永久变形随着白炭黑/硅土并用比减小而增大,回弹性降低。随着白炭黑/硅土并用比减小,硫化硅橡胶的储能模量逐渐降低,损耗因子逐渐增大。当硅土用量20份时,阻尼硅橡胶的损耗因子在-40~80℃内稳定在0.3附近。 相似文献
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《有机硅材料》2020,(1)
将9,10-二氢--9氧杂-10-磷杂菲-10-氧化物(DOPO)接入多乙烯基硅油制得含DOPO的多乙烯基硅油,并用于白炭黑的改性。以苯基硅橡胶为基料,添加改性白炭黑制得具有超分子作用的硅橡胶阻尼材料。研究了阻尼材料在温度、频率、振幅多参数环境下的动态力学性能。结果表明:在实验范围内,材料的储能模量随着频率的增加而提高,随着温度、振幅的增加而减小,储能模量变化范围为0. 214~1. 57MPa;损耗模量随着温度的增加而减小、随着频率的增加而提高、随着振幅的增加而先增后减,变化范围为0. 0194~0. 303 MPa,损耗模量最大值在233 K、100 Hz、30μm处;损耗因子随着温度的升高而减小,随着频率、振幅的增加而增大,变化范围为0. 0855~0. 416。材料的储能模量及损耗模量在低温(280 K)、低振幅(50μm)、低频率(20 Hz)环境下变化幅度较大,且均在温度、频率、振幅增长后逐渐趋于稳定。 相似文献
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采用高混的方法对芳纶短纤维和玄武岩短纤维与改性高岭土和硅烷偶联剂进行改性共混,通过改变芳纶短纤维长度和芳纶短纤维/玄武岩短纤维并用比,系统地研究了芳纶短纤维/玄武岩短纤维共混后对EPDM分散特性及其他物理性能影响。结果表明:随着芳纶短纤维/玄武岩短纤维共混比的降低,门尼黏度降低;沿纤维取向和垂直两个方向上拉伸强度、拉断伸长率、撕裂强度均增加,硬度逐渐减小,耐磨性能增加;储能模量逐渐降低,Payne效应减小。1 mm芳纶短纤维分散性和基本的物理性能优于3 mm芳纶短纤维,储能模量不如3 mm芳纶短纤维高。 相似文献
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芳香族聚酰胺纤维增强丁腈橡胶垫片材料 总被引:2,自引:0,他引:2
研究了纤维含量、粘合处理方法、混炼胶薄通知出片因素对芳香族聚酰胺短纤维增强NBR性能的影响。结果表明,芳香族聚酰胺短纤维的加入明显的NBR的拉伸强度、撕裂强度和溶胀性能。密封性能测试结果表明,该材料可以代替石棉增强NBR制作垫片,产品性能符合GB539-83指标。 相似文献
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以压缩永久变形为寿命分析研究对象,研究了常用工况下老化时间对黏弹性阻尼硅橡胶的储能模量、损耗模量及损耗因子的影响,同时采用热空气加速老化试验方法探究了黏弹性阻尼硅橡胶在不同温度(348,363,378,393 K)下压缩永久变形性能保持系数随老化时间的变化规律,并通过对两种老化动力学模型进行研究分析和修正获得了黏弹性阻尼硅橡胶的老化反应速率,此外,还对不同老化动力学模型下老化反应速率对Arrhenius模型的非线性行为进行了分段研究,推测了黏弹性阻尼硅橡胶的储存寿命。结果表明,在室温(298 K)下两种老化动力学模型在储存寿命为10.0 a时的压缩永久变形性能保持系数均为0.60;当选择压缩永久变形性能保持系数为0.50作为失效判据时,黏弹性阻尼硅橡胶的储存寿命分别为20.0 a和19.2 a,使用两种模型所得黏弹性阻尼硅橡胶的储存寿命误差仅为4%。 相似文献
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空气等离子体处理芳纶纤维及其与天然橡胶/乳聚丁苯橡胶的黏合性能 总被引:2,自引:0,他引:2
考察了空气等离子体处理对芳纶纤维表面结构形态的影响,研究了空气等离子体和间苯二酚-甲醛-胶乳(RFL)浸胶处理芳纶纤维与天然橡胶(NR)/乳聚丁苯橡胶(ESBR)的黏合性能,并对经处理的芳纶纤维与NR/ESBR体系的界面层作了动态力学分析。结果表明,芳纶纤维经空气等离子体处理后,表面粗糙度增大,表面积增加,结晶度减小,但处理功率过大、处理时间过长时,芳纶纤维的表面又变得比较光滑、结晶度又呈增大趋势。随着等离子体处理时间的延长,芳纶纤维与NR/ESBR的黏合性能增强,但处理时间过长时,芳纶纤维与NR/ESBR的黏合性能下降;等离子体处理芳纶纤维经RFL进一步浸胶处理后,芳纶纤维与NR/ESBR的黏合性能大幅度提高。芳纶纤维与NR/ESBR的界面存在介于高模量芳纶纤维和低模量橡胶之间的过渡层。 相似文献
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Shaji Joseph Sreekumar P. Appukuttan Jose M. Kenny Debora Puglia Sabu Thomas Kuruvilla Joseph 《应用聚合物科学杂志》2010,117(3):1298-1308
The dynamic mechanical properties of macro and microfibers of oil palm‐reinforced natural rubber (NR) composites were investigated as a function of fiber content, temperature, treatment, and frequency. By the incorporation of macrofiber to NR, the storage modulus (E') value increases while the damping factor (tan δ) shifts toward higher temperature region. As the fiber content increases the damping nature of the composite decreases because of the increased stiffness imparted by the natural fibers. By using the steam explosion method, the microfibrils were separated from the oil palm fibers. These fibers were subjected to treatments such as mercerization, benzoylation, and silane treatment. Resorcinol‐hexamethylenetetramine‐hydrated silica was also used as bonding agent to increase the fiber/matrix adhesion. The storage modulus value of untreated and treated microfibril‐reinforced composites was higher than that of macrofiber‐reinforced composites. The Tg value obtained for this microfibril‐reinforced composites were slightly higher than that of macrofiber‐reinforced composites. The activation energy for the relaxation processes in different composites was also calculated. The morphological studies using scanning electron microscopy of tensile fracture surfaces of treated and untreated composites indicated better fiber/matrix adhesion in the case of treated microfibril‐reinforced composites. Finally, attempts were made to correlate the experimental dynamic properties with the theoretical predictions. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010 相似文献
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Dynamic mechanical analysis of novel composites from commingled polypropylene fiber and banana fiber
Sherely Annie Paul Christoph Sinturel Kuruvilla Joseph G.D. Gem Mathew Laly A. Pothan Sabu Thomas 《Polymer Engineering and Science》2010,50(2):384-395
Polypropylene (PP)/banana fiber (BF) composites were fabricated from PP fiber and short BF by novel commingling method. The dynamic mechanical analysis (DMA) of the composites was performed with reference to BF loading and fiber surface treatments. By the incorporation of BF into the PP matrix, the storage modulus and loss modulus have been found to increase, whereas damping factor has been found to decrease. Glass transition temperature was found to increase with increase in BF loading. The viscoelastic properties of the composites were also found to depend on fiber surface treatments. The activation energy of the composites for the glass transition has been found to be increased by the increase in BF loading. Surface treatment of the BF further increased the activation energy of the composites, indicating a stronger interface for treated fiber composites. Scanning electron microscopy (SEM) photographs of the BF showed the physical changes induced by the surface treatments. Fourier transform infrared spectroscopy (FTIR) was used to ascertain the existence of the type of interfacial bonds. The use of theoretical equations to predict the storage modulus has also been discussed. POLYM. ENG. SCI., 2010. © 2009 Society of Plastics Engineers 相似文献