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首页> 外文期刊>Polymers for advanced technologies >Largely enhanced ductility of immiscible high density polyethylene/polyamide 6 blends via nano-bridge effect of functionalized multiwalled carbon nanotubes
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Largely enhanced ductility of immiscible high density polyethylene/polyamide 6 blends via nano-bridge effect of functionalized multiwalled carbon nanotubes

机译：通过功能化多壁碳纳米管的纳米桥效应大大提高了不混溶的高密度聚乙烯/聚酰胺6共混物的延展性

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摘要

Immiscible polymer blends usually exhibit negative deviation in mechanical properties compared with the corresponding pure polymers due to the weak interfacial bonding between the two polymers. Due to the bridge effect of the oriented carbon nanotubes (CNTs) on the craze and crack development at the load of stress, CNTs have been proved to be efficient toughening agent for polymers. In this work, functionalized multiwalled carbon nanotubes (FMWCNTs) have been introduced into immiscible high density polyethylene/polyamide 6 (HDPE/PA6) blends through different sample preparation methods. The mechanical measurements demonstrate that, when the nanocomposite is prepared from the HDPE master batch, the sample exhibits excellent tensile strength and toughness simultaneously. For all the nanocomposites, FMWCNTs tend to migrate and/or maintain in PA6 particles, leading to the variation of the crystallization behavior in PA6 phase. Further results based on morphologies characterization indicate that the intensified interfacial adhesion between HDPE and PA6, which is realized by the nano-bridge effect of FMWCNTs in the interfaces, is the main reason for the largely improved ductility.
机译：由于两种聚合物之间的弱界面键合，与相应的纯聚合物相比，不混溶的聚合物共混物通常在机械性能方面表现出负偏差。由于取向的碳纳米管（CNT）对应力作用下的裂纹和裂纹发展的桥接作用，已证明CNT是有效的聚合物增韧剂。在这项工作中，已通过不同的样品制备方法将功能化的多壁碳纳米管（FMWCNT）引入了不混溶的高密度聚乙烯/聚酰胺6（HDPE / PA6）共混物中。力学测量表明，当从HDPE母料制备纳米复合材料时，样品同时显示出优异的拉伸强度和韧性。对于所有纳米复合材料，FMWCNT倾向于在PA6颗粒中迁移和/或保持，从而导致PA6相中结晶行为的变化。基于形态表征的进一步结果表明，通过界面中FMWCNT的纳米桥效应实现的HDPE与PA6之间界面粘合性的增强是大幅改善延展性的主要原因。

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