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Compatibilized polypropylene nanocomposites containing expanded graphite and graphene nanoplatelets
Polymer Engineering and Science ( IF 3.2 ) Pub Date : 2021-01-31 , DOI: 10.1002/pen.25647 Quang Binh Ho 1 , Marianna Kontopoulou 1
Polymer Engineering and Science ( IF 3.2 ) Pub Date : 2021-01-31 , DOI: 10.1002/pen.25647 Quang Binh Ho 1 , Marianna Kontopoulou 1
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We present a non‐covalent compatibilization approach to prepare polypropylene (PP) composites containing expanded graphite (EG) and graphene nanoplatelets (GNPs) by melt compounding. This method involves PP matrix functionalization with pyridine (Py) moieties, which are capable of engaging in π‐π interactions with the surface of the EG and GNPs. The addition of 10 wt% of PP grafted with amino‐pyridine (PP‐g‐Py) to neat PP facilitated the break‐up of EG particles, by intercalating between their layers and facilitating their separation into smaller tactoids. GNPs were prepared starting from EG through a thermomechanical exfoliation method. Addition of GNPs to PP resulted in well‐dispersed platelets having aspect ratios as high as 40, whereas in the presence of the PP‐g‐Py compatibilizer the matrix contained sub‐micron scale platelets. The electrical percolation thresholds were in the vicinity of 6 and 10 vol% in the compatibilized PP‐EG and PP‐GNP composites, respectively, and the maximum value of the electrical conductivity achieved was 10−1 S/m for the compatibilized GNP composites. Addition of GNPs resulted in increases in the flexural moduli by as much as 95% compared to the unfilled PP, whereas the impact strength remained unaffected up to 10 wt% GNP content.
中文翻译：
相容的聚丙烯纳米复合材料，包含膨胀石墨和石墨烯纳米片
我们提出了一种非共价相容化方法，通过熔融混合制备包含膨胀石墨（EG）和石墨烯纳米片（GNP）的聚丙烯（PP）复合材料。该方法涉及使用吡啶（Py）部分对PP基质进行功能化，该部分能够与EG和GNP表面进行π-π相互作用。在纯聚丙烯中添加10 wt％的接枝有氨基吡啶（PP-g-Py）的聚丙烯有助于EG颗粒的分解，方法是在其各层之间进行插层并促进将其分离成较小的类触针。从EG开始，通过热机械剥离法制备GNP。在PP中添加GNPs可以使血小板充分分散，长宽比高达40，而在存在PP-g-Py增容剂的情况下，基质中含有亚微米级的血小板。相容的GNP复合材料的-1 S / m。与未填充的PP相比，添加GNP会导致弯曲模量增加多达95％，而冲击强度在GNP含量高达10 wt％的情况下仍不受影响。
更新日期：2021-04-09
中文翻译：
相容的聚丙烯纳米复合材料，包含膨胀石墨和石墨烯纳米片
我们提出了一种非共价相容化方法，通过熔融混合制备包含膨胀石墨（EG）和石墨烯纳米片（GNP）的聚丙烯（PP）复合材料。该方法涉及使用吡啶（Py）部分对PP基质进行功能化，该部分能够与EG和GNP表面进行π-π相互作用。在纯聚丙烯中添加10 wt％的接枝有氨基吡啶（PP-g-Py）的聚丙烯有助于EG颗粒的分解，方法是在其各层之间进行插层并促进将其分离成较小的类触针。从EG开始，通过热机械剥离法制备GNP。在PP中添加GNPs可以使血小板充分分散，长宽比高达40，而在存在PP-g-Py增容剂的情况下，基质中含有亚微米级的血小板。相容的GNP复合材料的-1 S / m。与未填充的PP相比，添加GNP会导致弯曲模量增加多达95％，而冲击强度在GNP含量高达10 wt％的情况下仍不受影响。
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