同步带芳纶骨架材料的性能特点

介绍了芳纶纤维的拉伸、弯曲和扭转性能，并与玻璃纤维进行了对比。介绍了所设计的３种芳纶帘线的拉伸、蠕变性能，并与玻璃纤维帘线作了对比、研究了以芳纶帘线为骨架材料的同步带的拉伸性能与耐疲劳性能。认为芳纶骨架材料同步带的性能优于玻璃纤维同步带。     

结构设计对传动带用浸胶芳纶线绳性能的影响

分别采用1670dtex和1100dtex芳纶丝,研究结构设计对传动带用浸胶芳纶线绳性能的影响。结果表明：当原丝总纤度相同时,随着初复捻捻度的增大,捻度系数增大,线绳的初始断裂强力呈减小趋势,疲劳后断裂强力保持率呈增大趋势;当捻度相同时,增大原丝纤度,可提高线绳的耐疲劳性能;当直径和捻度相同时,通过改变捻线结构,增大初捻捻度系数,保持复捻捻度系数不变,可使线绳的耐疲劳性能得到提高。     

国产高强高模芳纶Ⅲ纤维的拉伸性能测定

对11批次国产高强高模芳纶Ⅲ纤维进行了拉伸性能检测,结果表明:9批次的芳纶单束纱拉伸强度在4.78~5.32 GPa之间,拉伸弹性模量在123.71~129.26 GPa之间,断裂延伸率在3.87%~4.20%之间,离散系数均小于5%;2批次的合股束纱拉伸强度在4.96~5.02 GPa之间,拉伸弹性模量在106.7~107.7 GPa之间,断裂延伸率为4.60%,离散系数均小于5%,证明国产芳纶Ⅲ纤维已经具备了较好的力学性能。     

芳纶纤维及其复合材料的研究进展

介绍芳纶纤维的性能和研究现状、芳纶纤维复合材料的应用以及芳纶复合帘线的开发和性能改进。芳纶纤维具有多种独特性能,国内外对芳纶纤维进行了广泛研究,芳纶纤维制备与应用技术难题不断被攻克,芳纶纤维的应用越来越广泛。芳纶纤维生产现主要集中在美国、日本和欧洲,近年来我国芳纶纤维的产业化发展迅速。芳纶纤维复合材料在军用和民用领域均得到广泛应用。芳纶复合帘线主要分为合股复合帘线和芯皮结构复合帘线。芳纶复合帘线改进的性能主要有耐压缩疲劳性能、拉伸性能和粘合性能。     

芳纶复合帘线耐疲劳性能研究

分别测定了芳纶帘线的拉伸疲劳性能和压缩弯曲疲劳性能、结果表明，芳纶／尼龙复合帝线拉伸疲劳后强力保持率较高，且基本不受捻度的影响；复合帘线的压缩弯曲疲劳性能较纯芳纶帘线好，与加捻条件有关。     

RFL体系改性对芳纶帘线-橡胶粘合性能的影响

介绍了芳纶帘线-橡胶界面粘合性能的研究方法,并对芳纶帘线-橡胶复合材料静态粘合性能进行研究,采用H抽出对其进行评价。研究和评价的结果表明,采用改性剂M改性的RFL浸渍系统对芳纶纤维与橡胶粘合能力有显著的提高,并且得出了改性剂M填加量的最佳值。     

对位芳纶短纤维/氢化丁腈橡胶复合材料的制备及其结构性能

采用综合性能优异的氢化丁腈橡胶(HNBR)和耐高温对位芳纶短纤维复合,制备了高强度、高模量和耐高温的复合材料,比较了芳纶短纤维类型、纤维用量等对复合材料力学性能和流变行为的影响。结果表明,芳纶浆粕(PPTA-pulp)比芳纶短切纤维(DCF)对橡胶有更佳的增强效果,二者都能明显提高HNBR的高温强度,但PPTA-pulp的效果更为明显。PPTA-pulp增强橡胶复合材料的挤出物外观性能也较DCF增强橡胶复合材料好。     

表面处理对玻纤/碳纤增强橡胶基密封复合材料性能的影响

采用压延成张工艺制备碳纤维和玻璃纤维混杂增强非石棉橡胶基密封复合材料(NAFC),以横向抗拉强度作为表征混杂增强橡胶基密封材料中纤维与橡胶界面粘结性能的指标.通过扫描电镜(SEM)对材料横向拉伸试样断口进行形貌分析,及对材料的耐油、耐酸、耐碱性能进行测试,探讨了不同表面处理工艺对纤维与基体界面粘结效果的影响.研究结果表明,对玻璃纤维采用偶联剂KH-550浸渍后涂覆环氧树脂涂层,对碳纤维在空气氧化后涂覆环氧树脂涂层,可有效增强纤维、基体的界面粘结,所制得的混杂纤维增强复合材料具有较好的机械性能和耐介质性能.     

不用环氧化树脂增进芳纶与橡胶的粘合

不用环氧化树脂增进芳纶与橡胶的粘合美国《橡胶化学和工艺》１９９６年６８卷４期６９１页报道：芳纶具有高拉伸强度和模量，其收缩率实际等于零，而且还具有优异的耐化学药品和耐热性能。尽管有这些优点，芳纶要在橡胶制品中用作增强材料，还取决于纤维与橡胶基体的粘合...     

国内外橡胶行业应用芳纶的现状

介绍了国内外橡胶制品应用芳纶作为增强材料的现状，并对我国独立开发芳纶纤维和扩大在橡胶制品中的应用提出了建议。芳纶纤维在橡胶 行业中的用量较大，占芳纶纤维总消耗量的20％。以芳纶纤维制成的帘布、线绳、纱线、帆布、整体带芯、直径直纬织物等被用作轮胎、传动带、输送带、胶管的骨架材料，芳纶短纤维掺入轮胎胎面等部件胶料和V带底胶胶料中起补强作用。     

芳纶帘线性能及在轮胎中的应用研究

进行了芳纶（Ｔｗａｒｏｎ）帘线动态力学性能的研究及其在轿车子午线轮胎、轻载子午线轮胎、工程机械轮胎总结层中的应用试验。结果表明,芳纶帘线具有动态模量高、滞后损失小的优异性能。芳纶增强轮胎具有轻量、高速及使用寿命长等特点。     

芳香族聚酰胺纤维增强丁腈橡胶垫片材料

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。     

The effect of magnitude and type of cyclic strain on the strength of viscose tyre cord

Conclusions 1. The effect of the magnitude and type of strain on change of strength of viscose tyre cord has been studied by fatigue testing rubber and cord specimens.2. It is found that the nature of change in strength of tyre cord under repeated tensile and alternating tensile — compressive strains is similar. Therefore, the results of tests on bare cord under repeated tensile test can be used to indicate its fatigue properties.Balakovskii Factory; All-Union Scientific-Research Institute for Synthetic Fibres (VNIIV). Translated from Khimicheskie Volokna, No. 5, pp. 51–53, September–October, 1969.     

芳纶针织物复合材料力学性能研究

为探究芳纶针织物复合材料的力学性能,用电子织物强力机对平板硫化机制得的芳纶针织物复合材料进行拉伸、弯曲、压缩性能测试,结果表明:芳纶针织物增强复合材料为非脆性破坏;经硅烷偶联剂处理有效地提高了芳纶针织物增强复合材料的抗拉、抗弯、抗压强度;罗纹空气层组织的抗拉、抗弯及抗压性能优于满针罗纹组织。     

等离子体处理对芳纶帘线/橡胶复合材料界面的影响

研究了等离子体的处理功率、处理时间和气氛以及芳纶帘线浸胶处理与否对芳纶帘线／橡胶复合材料界面的影响。结果表明,经过等离子体处理后,未浸胶芳纶帘线在H抽出时发生界面破坏,而结合浸胶处理．H抽出时破坏由橡胶基体逐步向芳纶帘线发展,橡胶基体能有效地通过界面向芳纶帘线表面传递应力;最佳的等离子体处理条件是在空气气氛中,处理功率为50w,处理时间为5min。     

芳纶纤维增强丁腈橡胶的摩擦性能

研究了芳纶纤维增强丁腈橡胶(NBR)复合材料的物理机械性能和摩擦性能,并用扫描电子显微镜分析了芳纶纤维增强NBR复合材料的磨损表面和磨屑形貌。结果表明,芳纶的加入提高了NBR的拉伸强度;随着芳纶用量的增大,复合材料的扯断伸长率降低;芳纶的加入降低了NBR的摩擦系数和磨损率;当芳纶用量为20份时,复合材料的综合性能最佳。加入芳纶对NBR摩擦磨损形式的改变是NBR摩擦性能提高的重要原因。     

Experimental study on mechanical properties of aramid fibres reinforced natural rubber/SBR composite for large deformation – quasi-static mechanical properties

Quasi-static mechanical properties of aramid fibres reinforced natural rubber/SBR composites are comprehensively investigated via scanning electron microscopy (SEM), uniaxial tensile tests, multi-step stress relaxation, and the Mullins experiment. The strength, stiffness, viscoelasticity, and Mullins effect of composites are analysed, and the micro failure mechanism is also explored. It is shown that the samples appear similar to a laminate plate with random short fibres in a plane. The results of the uniaxial tensile tests indicate that the tensile strength and elongation at failure decrease, while the stiffness increases following the addition of a small amount of aramid fibres into the rubber matrix. The multi-step relaxation and Mullins experiments reveal that the aramid-short-fibres weaken the viscoelasticity of rubber composites. Finally, the strain energy of the composite is divided into four parts, and one part is considered with respect to its application to the study of interface destruction between the matrix and fibre.     

Effects of interphase conditions on the tensile and fatigue properties of short-fiber reinforced rubber

The effects of the amount of nylon-66 short-fiber and its bonding to a chloroprene rubber were studied. The following results were obtained: (a) The tensile strength of short-fiber reinforced rubber (SFRR) exhibits a dilution effect in each interphase. It was found that the interphase conditions have an important effect on the dilution ratio and the critical fiber content. The specimen with double coatings of the bonding agent and a rubber solution, becomes the best of 5 interphase models. Both the yield strength and tensile moduli significantly improve with fiber content. (b) The spring constant (SC) of unreinforced rubber decreases after the fatigue test, however, the SC of all reinforced rubbers increases. The change in SC of reinforced rubber decreases with fiber content. The better the interphase condition, the smaller the change of the SC. (c) The temperature of rubber increases about 2.6 fold after the fatigue test. The reinforced rubbers show a 1.4 to 2.2 fold increase in temperature. The temperature changes during the fatigue test of the reinforced rubbers decrease with increasing fiber content, as well as with improved interphase bonding.     

A new coupling agent for aramid fibers

Various compounds were used for the surface treatment of aramid fibers in order to promote adhesion to polymeric matrices. The improvement of adhesive bond could be based either on the roughness of fiber surface or on chemical modification introduced by grafting. The compounds used are more or less reactive to the secondary amide groups, present on the aramid chain. Thus, the fibers were impregnated with acetic acid anhydride, sulfuric acid–acrylamide, and methacryloyl chloride. The effect of such treatment was first evaluated by optical microscopy and infrared analysis. Tensile measurements were also carried out in order to define any changes of strength and modulus. Finally, tensile specimens were prepared using unsaturated polyester reinforced with aramid fibers and the effect of chemical treatment on the tensile strength was determined. From the above study, methacryloyl chloride was proved an effective coupling agent with possible grafting to aramid fibers.