Isotactic polypropylene (i-PP) – montmorillonite (MMT) nanocomposite films were prepared by melt-compounding and hot-pressing. The influence of organoclays on the mechanical properties and drawability of these isotropic composite films was investigated. Ultimate properties of solid-state drawn PP tapes incorporating 2.5 wt% MMT outperformed those of pure PP tapes. Interestingly, these improvements were found not to be the result of a mechanical reinforcement effect of the nanoclay platelets but merely the result of a more efficient ultra-drawing mechanism with MMT acting as a processing additive that altered initial polymer morphology and drawing behaviour. Hence, the introduction of MMT resulted in higher ultimate draw ratios and subsequently higher ultimate mechanical properties of the oriented nanocomposite tapes.

等规聚丙烯（i-PP）–蒙脱土（MMT）纳米复合膜是通过熔融复合和热压制备的。研究了有机粘土对这些各向同性复合膜的力学性能和可拉伸性的影响。掺有2.5 wt％MMT的固态拉伸PP胶带的最终性能优于纯PP胶带。有趣的是，发现这些改进不是纳米粘土血小板的机械增强作用的结果，而仅仅是以MMT作为加工添加剂的更有效的超拉伸机理的结果，该添加剂改变了初始聚合物的形态和拉伸行为。因此，MMT的引入导致取向的纳米复合带的更高的最终拉伸比和随后的更高的最终机械性能。