Surface modification of Kevlar fibers with titanate coupling agents for improved adhesion of the fiber and resin in Kevla–phenolic composites has been attempted to explore the possibility of enhancement in adhesion and bulk properties of composites for friction materials. Titanate coupling agents were used and flexural properties of the Kevlar–fiber reinforced composites determined. A study of different amounts of the coupling agents at the fiber–matrix interface suggested that 2% by weight of fiber was the optimum amount, in terms of improvement in flexural properties. The composite samples with the coupling agents showed an increase in flexural strength over the untreated samples, with the maximum increase of about 18% over the control. Water-absorption studies were conducted on Kevlar–phenolic composites treated with organotitanates to detemine the effectiveness of these coupling agents in improving resistance to moisture attack. The treated Kevlar–phenolic composite samples exhibited greater resistance to moisture-ingress over the untreated samples. The control samples showed a decrease of 17% in flexural strength. The largest decrease in strength was 14% for the treated samples containing coupling agent tetrakis (2-ethylhexyl) titanate (TYZOR TOT). Recovery in strength on reconditioning was also greater for treated samples over control. A recovery in strength of about 94% was seen for some treated samples. © 1994 John Wiley & Sons, Inc.

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钛酸酯偶联剂在凯夫拉尔-酚醛复合材料中的应用

试图用钛酸酯偶联剂对凯夫拉尔纤维进行表面改性，以改善纤维和树脂在凯夫拉-酚醛复合材料中的粘合性，以探索提高摩擦材料复合材料的粘合性和体积特性的可能性。使用了钛酸酯偶联剂，并确定了凯夫拉尔纤维增强复合材料的弯曲性能。对纤维-基质界面处不同数量偶联剂的研究表明，就改善弯曲性能而言，2％（重量）的纤维是最佳用量。与未处理的样品相比，具有偶联剂的复合材料样品的抗弯强度有所增加，与对照相比最大增加了约18％。对用有机钛酸酯处理过的凯夫拉尔-酚醛复合材料进行了吸水研究，以确定这些偶联剂在提高抗潮性方面的有效性。经过处理的凯夫拉尔-酚醛复合材料样品比未经处理的样品显示出更高的耐潮性。对照样品显示出抗弯强度降低了17％。对于含有偶合剂四（2-乙基己基）钛酸酯（TYZOR TOT）的处理样品，强度的最大降低为14％。与对照相比，处理过的样品的修复强度恢复也更大。对于一些处理过的样品，强度恢复了约94％。分级为4 +©1994 John Wiley＆Sons，Inc. 经过处理的凯夫拉尔-酚醛复合材料样品比未经处理的样品显示出更高的耐潮性。对照样品显示出抗弯强度降低了17％。对于含有偶合剂四（2-乙基己基）钛酸酯（TYZOR TOT）的处理样品，强度的最大降低为14％。与对照相比，处理过的样品的修复强度恢复也更大。对于一些处理过的样品，强度恢复了约94％。分级为4 +©1994 John Wiley＆Sons，Inc. 经过处理的凯夫拉尔-酚醛复合材料样品比未经处理的样品显示出更高的耐潮性。对照样品显示出抗弯强度降低了17％。对于含有偶合剂四（2-乙基己基）钛酸酯（TYZOR TOT）的处理样品，强度的最大降低为14％。与对照相比，处理过的样品的修复强度恢复也更大。对于一些处理过的样品，强度恢复了约94％。分级为4 +©1994 John Wiley＆Sons，Inc. 与对照相比，处理过的样品的修复强度恢复也更大。对于一些处理过的样品，强度恢复了约94％。分级为4 +©1994 John Wiley＆Sons，Inc. 与对照相比，处理过的样品的修复强度恢复也更大。对于一些处理过的样品，强度恢复了约94％。分级为4 +©1994 John Wiley＆Sons，Inc.