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Tensile behaviour and fracture characteristics of polydimethylsiloxane (PDMS) filled silica composites

机译:聚二甲基硅氧烷(PDMS)填充的二氧化硅复合材料的拉伸行为和断裂特性

摘要

The focus of this study is to investigate the mechanical properties and fracture behaviour of polydimethylsiloxane filled crystalline silica composites (PDMSJCS) via tensile test. The PDMSICS composites were fabricated by using casting method and cured at room temperature for 24hours. Crystalline silica were filled into PDMS at composition of 2, 6, 10 wt%. The tensile properties of PDMS/2wt%CS showed that the tensile stress was improved by 4.3%. Fracture behaviour of the tested PDMSICS composites were characterized using Scanning ElectronMicroscopy (SEM) and Atomic Force Microscopy (AFM) which used to determine the characteristic of fracture surface. Observation via SEM and AFM showed that the increment of filler in PDMS increased the tendency of the fillerto be agglomerated and increase the surface roughness of PDMSJCS composites. Thus, this concludes that the agglomeration of fillers effect to the overall mechanical strength of the PDMSJCS is insignificant. However, theadditions of fillers were proven to improve the strength of the composites.
机译:这项研究的重点是通过拉伸试验研究聚二甲基硅氧烷填充的结晶二氧化硅复合材料(PDMSJCS)的力学性能和断裂行为。通过浇铸法制备PDMSICS复合材料,并在室温下固化24小时。将结晶二氧化硅以2、6、10重量%的组成填充到PDMS中。 PDMS / 2wt%CS的拉伸性能表明,拉伸应力提高了4.3%。使用扫描电子显微镜(SEM)和原子力显微镜(AFM)表征了测试过的PDMSICS复合材料的断裂行为,可用来确定断裂表面的特征。通过SEM和AFM观察表明,PDMS中填料的增加增加了填料的团聚趋势,并增加了PDMSJCS复合材料的表面粗糙度。因此,得出的结论是,填料的团聚对PDMSJCS的整体机械强度的影响微不足道。然而,事实证明,添加填料可以提高复合材料的强度。

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