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首页> 外文期刊>Journal of Materials Research >Nanoscale repetitive impact testing of polymer films
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Nanoscale repetitive impact testing of polymer films

机译：聚合物薄膜的纳米级重复冲击测试

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The deformation of polymer films under repetitive contact at high strain rates was investigated using nanoscale impact testing. Four systems were studied: (i) rubber-modified acrylonitrile-butadiene-styrene (ABS) (0-25 wt percent rubber), (ii) uniaxially and biaxially drawn poly(ethylene terephthalate) film; (iii) poly(ethylene oxide)-clay nanocomposites, and (iv) nylon 6-organoclay nanocomposites. The initial results suggest that the technique has much potential in evaluating the fatigue behavior of thinner polymer films and coatings that are unsuitable for conventional methods designed for bulk samples. The extent of impact-induced deformation may be used as a measure of ductility because ductile failures are associated with significant plastic deformation before failure whereas brittle failures usually involve little plastic deformation. The nano-impact technique provides valuable highly localized information about deformation under high strain rate, which is complementary to low strain rate tests such as nanoindentation and nano-scratch. The technique has been shown to be sensitive to nano-/microstructural variations in ABS-rubber film when Berkovich indenters and low impact forces were used. The impact behavior of the nanocomposites is only significantly worse than that of the virgin polymers at the highest clay loading studied (15 wt percent). This could be a factor when assessing the suitability of novel nanocomposite materials for applications where toughness is important. On ABS film, there is only an approximate correlation between the plastic work function determined from nanoindentation and the rubber loading in the film while the correlation between the rubber loading and nano-impact data is clear, suggesting that the dynamic test is a more useful predictor of thin polymer film toughness than the slow-loading quasi-static indentation test.
机译：使用纳米级冲击试验研究了在高应变速率下反复接触下聚合物膜的变形。研究了四个体系：（i）橡胶改性的丙烯腈-丁二烯-苯乙烯（ABS）（0-25重量百分比的橡胶），（ii）单轴和双轴拉伸的聚对苯二甲酸乙二醇酯薄膜； （iii）聚（环氧乙烷）-粘土纳米复合材料，和（iv）尼龙6-有机粘土纳米复合材料。初步结果表明，该技术在评估较薄的聚合物薄膜和涂层的疲劳性能方面具有很大的潜力，这些薄膜和涂层不适用于为大块样品设计的常规方法。冲击引起的变形的程度可以用作延性的度量，因为延性破坏与破坏前的明显塑性变形相关，而脆性破坏通常仅涉及很小的塑性变形。纳米冲击技术提供了有关高应变速率下变形的有价值的高度局部化的信息，这是对低应变速率测试（例如纳米压痕和纳米划痕）的补充。已经证明，当使用Berkovich压头和低冲击力时，该技术对ABS橡胶薄膜中的纳米/微观结构变化敏感。在研究的最高粘土含量（15 wt％）下，纳米复合材料的冲击行为仅显着低于原始聚合物的冲击行为。当评估新型纳米复合材料对韧性很重要的应用的适用性时，这可能是一个因素。在ABS薄膜上，由纳米压痕确定的塑性功函数与薄膜中的橡胶负载之间只有一个近似的相关性，而橡胶负载和纳米碰撞数据之间的相关性却很明显，这表明动态测试是一个更有用的预测指标聚合物薄膜的韧性比缓慢加载的准静态压痕测试好。

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