具有更好热化学稳定性的聚乙烯/石墨烯-纳米颗粒纳米复合材料:石墨烯纳米颗粒表面极性的作用

IF 4.8 2区 材料科学 Q2 MATERIALS SCIENCE, COMPOSITES Polymer Composites Pub Date : 2024-08-30 DOI:10.1002/pc.28904
Hamidreza Ghadami Karder, Gholamreza Pircheraghi
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引用次数: 0

摘要

最近的研究表明,石墨烯纳米片(GNP)可吸收自由基,减缓聚合物降解。一项研究调查了 GNP 极性和浓度对聚乙烯在含 ClO2 水中稳定性的影响。添加石墨烯纳米片 SG:高极性和 CG:低极性可提高双峰高密度聚乙烯(PE100)的热氧化稳定性。根据氧化诱导时间(OIT),使用传统的一级和二级抗氧化剂以及添加 0.1% 的 CG 后,PE100 的热氧化稳定性显著提高。GNP 的协同热稳定效应来自 CG 的自由基清除和曲折路径效应。流变学测量结果表明,适当的纳米填料和抗氧化剂结合使用可防止聚合物在熔融加工过程中发生热氧化降解。在含二氧化氯的水中老化 3 周后,纯样品(PE100)的断裂伸长率仅为 50%,而含有 0.6 wt% CG 的样品在 3 周后的断裂伸长率为 200%,这是因为 CG 结构形成了曲折屏障并能清除自由基。适当的纳米填料和抗氧化剂可防止聚合物在熔融加工过程中发生热氧化降解。低极性 GNP 可以更均匀地分散在纳米复合材料基体中。含有低极性 GNP 的纳米复合材料具有更强的抗热化学降解能力。
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Polyethylene/graphene‐nanoplatelets nanocomposites with improved thermochemical stability: The role of surface polarity of graphene‐nanoplatelets
Recent studies have shown that graphene nanoplatelets (GNP) absorb free radicals and slow polymer degradation. A study has been conducted to investigate the effects of GNP polarity and concentration on polyethylene stability in ClO2‐containing water. The addition of graphene nanoplatelets SG: high polarity and CG: low polarity improved the thermo‐oxidative stability of bimodal high‐density polyethylene (PE100). As a result of the application of traditional primary and secondary antioxidants, as well as the addition of 0.1% CG, the thermo‐oxidative stability of PE100 was significantly increased, according to the oxidative induction time (OIT). The synergistic thermal stabilization effect of GNP is derived from the free radical scavenging and tortuous path effect of CG. Rheological measurements showed that the appropriate nanofiller and antioxidant combined prevent polymer thermo‐oxidation degradation during melt processing. As a result of 3 weeks of aging in chlorine dioxide‐containing water, the neat sample (PE100) demonstrates only 50% elongation at break, whereas the sample with 0.6 wt% of CG shows 200% elongation at break after 3 weeks, due to the formation of a tortuous barrier and radical scavenging of the CG structures.Highlights DPPH assay test confirms the antioxidant scavenging capability of the GNPs. The appropriate nanofiller and antioxidant combined to prevent polymer thermo‐oxidation degradation during melt processing. Low polarity GNP can be dispersed more uniformly in the nanocomposite matrix. Nanocomposite containing lower polarity GNP shows more resistance against thermochemical degradation.
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来源期刊
Polymer Composites
Polymer Composites 工程技术-材料科学:复合
CiteScore
7.50
自引率
32.70%
发文量
673
审稿时长
3.1 months
期刊介绍: Polymer Composites is the engineering and scientific journal serving the fields of reinforced plastics and polymer composites including research, production, processing, and applications. PC brings you the details of developments in this rapidly expanding area of technology long before they are commercial realities.
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