材料科学
复合材料
纳米纤维
环氧树脂
扫描电子显微镜
复合数
断裂韧性
韧性
模数
弹性体
丁苯橡胶
天然橡胶
脆性
胡须
聚合物
苯乙烯
共聚物
作者
Jong-sang Kim,D Reneker
摘要
Abstract The objective of this research was to show the reinforcing effects of nanofibers in an epoxy matrix and in a rubber matrix using electrospun nanofibers of PBI (polybenzimidazole). The average diameter of the electrospun fibers was around 300 nanometers, which is less than one tenth the diameter and 1/100 the cross sectional area of ordinary reinforcing fibers. The ultrafine fibers provide a very high ratio of surface area to volume. The nanofibers toughened the brittle epoxy resin. The fracture toughness and the modulus of the nanofiber (15 wt%)‐reinforced epoxy composite were both higher than for an epoxy composite made with PBI fibrids (17 wt%), which are whisker‐like particles. In an elastomeric matrix, The Young's modulus and tear strength of the chopped nanofiber‐reinforced styrene‐butadiene rubber (SBR) were higher than those of the pure SBR. Micrographs of the fracture surfaces were obtained by scanning electron microscopy (SEM).
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