Normally, the effective dispersion of thermal conductive fillers is a prerequisite for ensuring thermally conductive networks formed in polymer composites. In this work, a facile method was provided by using cellulose to alter the distribution state of boron nitride (BN) for the preparation of high thermally conductive polylactic acid (PLA). After powder mixing and hot‐pressing process, the Cellulose@BN was located at the boundaries of PLA granules to form consecutive thermally conductive networks with more compact structure. Morphology observation and FTIR spectra confirmed that BN edges absorbed on the cellulose surface under the intermolecular hydrogen bond interaction between PLA and BN. At the BN content of 25 wt%, contrasted with traditional BN/PLA segregated polymer composites (SPCs), thermal conductivity coefficient of Cellulose@BN/PLA SPCs improved by 53.5% from 0.71 to 1.09 Wm⁻¹ K⁻¹. This enhancement could be attributed to the reason that the cellulose regulated stripe aggregation allowed the BN connect with each other more compact, thus a thermal conduction networks with reduced phonon scattering were formed.

中文翻译：

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通过纤维素网络中的氢键调节，实现隔离的BN / PLA复合材料的高导热性

通常，导热填料的有效分散是确保聚合物复合材料中形成导热网络的先决条件。在这项工作中，通过使用纤维素改变氮化硼（BN）的分布状态来制备高导热聚乳酸（PLA），提供了一种简便的方法。经过粉末混合和热压处理后，Cellulose @ BN位于PLA颗粒的边界，以形成结构更紧凑的连续导热网络。形态观察和FTIR光谱证实，在PLA和BN之间的分子间氢键相互作用下，BN边缘吸收在纤维素表面上。与传统的BN / PLA隔离聚合物复合材料（SPC）相比，BN含量​​为25 wt％时，^-1 K ^-1。这种增强可以归因于纤维素调节的条带聚集使得BN彼此更紧密地连接，从而形成了具有减少的声子散射的热传导网络的原因。