Self reinforced polymer composites possess a comparable shear and tensile strength unlike the glass or carbon fibre reinforced composites. Important deciding factors of overall efficiency of composite materials are the interfacial adhesion properties between the fibre and the matrix. Structural properties and processability of composite materials are also dependent on adhesion between the fibre and the matrix. Polypropylene and polyethylene self-reinforced composites are the systems investigated here for the purpose of analyzing the interfacial properties of these systems. Multiple fibre pullout test is an alternate method for single fibre pullout test with added advantages of more reliable statistically averaged data with less standard deviation and minimized chances for fibre breakage during testing. This test can also be verified for various volume fractions unlike single fibre pullout test. Micro bonds of matrix materials are cured on a bundle of fibres and by using a micro vise as an additional fixture, the interfacial strength and other interfacial properties are evaluated through fibre pullout. Surface tension between the fibre and the matrix plays an important role in this test. Thus from the contact angle and the frictional properties of the interface, the interface properties are evaluated. Interface properties obtained from this meso-mechanical semi empirical method are also compared with the properties evaluated from micromechanical formulations. Spectroscopic studies revealed the bonding characteristics during the interface formation and after failure. Fractography reveals the cause and nature of failure and substantiate the analysis.

中文翻译：

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微粘结纤维束拉拔技术评估聚乙烯和聚丙烯自增强复合材料的界面粘合力

自增强聚合物复合材料具有与玻璃或碳纤维增强复合材料不同的剪切和拉伸强度。复合材料整体效率的重要决定因素是纤维与基质之间的界面粘合性能。复合材料的结构特性和可加工性还取决于纤维与基体之间的粘合力。聚丙烯和聚乙烯自增强复合材料是本文研究的系统，目的是分析这些系统的界面性能。多光纤拔出测试是单光纤拔出测试的另一种方法，具有以下优势：统计更可靠的统计平均值数据，标准偏差较小，并且在测试过程中纤维断裂的可能性最小。与单纤维拉拔测试不同，该测试还可针对各种体积分数进行验证。将基体材料的微键固化在纤维束上，并使用微型虎钳作为附加夹具，通过纤维拉拔来评估界面强度和其他界面特性。纤维和基质之间的表面张力在该测试中起重要作用。因此，从接触角和界面的摩擦特性评估了界面特性。还将从这种细观力学半经验方法获得的界面特性与从微观力学配方评估得到的特性进行了比较。光谱研究揭示了界面形成过程中和失效后的结合特性。