The fibre volume fraction is the primary physical performance parameter, while the mechanical research focuses on the composite elastic properties.
纤维体积分数是物理性能研究的最主要参数，力学分析以复合材料的弹性性能为主。
The oil resistance and mechanical properties of NBR/PVC blends were improved with the increase of mass fraction of acrylonitrile of NBR.
结果表明，随着NBR中结合丙烯腈质量分数的增加，NBR/PVC共混胶的耐油性能明显增强，力学性能也相应有所改善；
The graft copolymer was a kind of thermoplastic elastomer with good mechanical properties when mass fraction of polystyrene macromer was about 40%.
结果表明，当聚苯乙烯大单体的投料质量分数在40%左右时，此接枝共聚物是一种性能良好的热塑性弹性体。
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