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首页> 外文期刊>RSC Advances >Understanding the effects of carboxylated groups of functionalized graphene oxide on the curing behavior and intermolecular interactions of benzoxazine nanocomposites
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Understanding the effects of carboxylated groups of functionalized graphene oxide on the curing behavior and intermolecular interactions of benzoxazine nanocomposites

机译：了解官能化石墨烯氧化物对苯并嗪纳米复合材料的固化行为和分子间相互作用的影响

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Novel benzoxazine (BOZ)/carboxylated graphene oxide (GO-COOH) composites were prepared via in situ intercalative polymerization. The curing behaviour, morphology and intermolecular interactions of GO-COOH based nanocomposites were investigated and compared with those of a graphene oxide (GO) blend system to clarify the influence of carboxylic groups. Compared to GO, GO-COOH with a large amount of carboxylic groups, relatively higher thermal stability, and exfoliated sheet morphology might be more easily dispersed and reacted in the BOZ matrix. The GO-COOH nanoplatelet based composites possessed a different polymerization path from that of the GO based system, implying that carboxylic groups not only provided catalytic effects but also participated in the grafting polymerization reactions between carboxyl groups of GO-COOH and phenolic hydroxyl groups of BOZ. A significant improvement of both the glass transition temperature ( T _(g) ) and crosslinking network density of the GO-COOH blend system further confirmed that covalent bonding occurred between filler and polymer chains, indicating that the GO-COOH nanoplatelets had a stronger influence on the thermal property improvement of the nanocomposites than that of the GO blend system. Surprisingly, a very low amount (1 wt%) of GO-COOH can affect the thermal properties of the composite remarkably, leading to a more than 30 °C increase of T _(g) in comparison with pure benzoxazine.
机译：通过原位间隔聚合制备新的苯并恶嗪（BOZ）/羧化石墨烯氧化物（GO-COOH）复合材料。研究了Go-CoOH基纳米复合材料的固化行为，形态和分子间相互作用，并与石墨烯（GO）混合系统的氧化物（GO）混合系统进行了比较，以阐明羧基的影响。与Go相比，具有大量羧基的Go-CoOH，相对较高的热稳定性和剥落的片状形态可以更容易地分散并在Boz基质中反应。基于Go-CoOH纳米片的复合材料具有来自基于去的系统的不同聚合路径，这意味着羧基不仅提供催化效果，而且还参与了Boz的Go-CoOH和酚羟基之间的羧基之间的接枝聚合反应。玻璃化转变温度（T _（g））和Go-CoOH混合物系统的交联网络密度的显着改善进一步证实了填料和聚合物链之间发生的共价键，表明Go-CoOH纳米片具有更强的影响关于纳米复合材料的热性质改善而不是去混合系统的热性能。令人惊讶的是，与纯苯恶嗪相比，非常低的Go-CoOH的Go-CoOH可以显着影响复合材料的热性质，导致T _（g）增加了30°C。

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