杂化GNPs和硅烷功能化BN导热胶的导热性能和剪切强度表征

IF 2.9 4区 材料科学 Q2 ENGINEERING, CHEMICAL Journal of Adhesion Pub Date : 2022-12-22 DOI:10.1080/00218464.2022.2158084
S. Jasmee, M. Ramli, S. S. Othaman, G. Omar
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引用次数: 2

摘要

摘要对导热粘合剂的高导热性和改善粘合性的需求增加了对具有非凡性能的混合填料的需求,如氮化硼(BN)和石墨烯纳米片(GNP),尤其是在较低填料含量(<20wt.%)下,尤其是硅烷官能化的BN(fBN)和使用单搭接方法的粘合。因此,本研究旨在测量不同填料尺寸、GNP比率和硅烷偶联剂(KK550和KH560)下具有BN或fBN的杂化GNP的热导率和剪切强度。我们观察到,比例为0.75的GNP/fBN_KH560杂化复合材料表现出最高的导热率和剪切强度,分别提高了198.42%和81.82%,这归因于fBN_KH560与聚合物基体之间的高度相容性,测量的接触角和Hansen溶解度参数差异最小。尽管热导率值没有超过单一填充的GNP复合材料,但较低填料含量的混合复合材料被认为是成功的,因为与单一填充的BN或fBN相比,它表现出协同效应;差异为0.111。此外,裂纹偏转、颗粒脱粘和拔出机制提高了混杂复合材料的抗剪强度,促进了复合材料的内聚破坏。
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Thermal conductivity and shear strength characterisation of hybrid GNPs and silane functionalised BN as thermal conductive adhesive
ABSTRACT The demand for high thermal conductivities and improved adhesion of thermal conductive adhesives has heighten the need for hybrid fillers with extraordinary properties, such as boron nitride (BN) and graphene nanoplatelets (GNP) especially at lower filler contents (<20 wt.%), particularly with silane-functionalised BN (fBN) and adhesion using the single lap joints approach. Thus, this study was conducted to measure the thermal conductivity and shear strength of hybrid GNP with BN or fBN at different filler sizes, GNP ratios, and silane coupling agents (KK550 and KH560). We observed that the hybrid GNP/fBN_KH560 composite at a ratio of 0.75 exhibited the highest thermal conductivity and shear strength with enhancements of 198.42% and 81.82%, respectively, attributed by the high compatibility between fBN_KH560 and the polymer matrix, proven by the lowest measured contact angle and Hansen solubility parameter difference. Despite the thermal conductivity value not surpassing that of the single-filled GNP composite, the hybrid composite at lower filler content was considered a success as it exhibited a synergetic effect when compared with single-filled BN or fBN; with the difference of 0.111. Besides, crack deflection, particle debonding and pull-out mechanism improved the shear strength and promoted cohesive failure in the hybrid composite.
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来源期刊
Journal of Adhesion
Journal of Adhesion 工程技术-材料科学:综合
CiteScore
5.30
自引率
9.10%
发文量
55
审稿时长
1 months
期刊介绍: The Journal of Adhesion is dedicated to perpetuating understanding of the phenomenon of adhesion and its practical applications. The art of adhesion is maturing into a science that requires a broad, coordinated interdisciplinary effort to help illuminate its complex nature and numerous manifestations.
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