Achieving a high thermal conductivity for segregated BN/PLA composites via hydrogen bonding regulation through cellulose network

Abstract

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.

High‐Entropy Microdomain Interlocking Polymer Electrolytes for Advanced All‐Solid‐State Battery Chemistries

“…Notably, redshift and broadening of the OH-stretching fundamental band in infrared spectra were found by comparing PLA and ABCTPs (Figure 2d), which confirmed the formation of hydrogen bonds (between -Br of PS chains and -OH of PLA chains). [11] Free-standing HEMI-ASPE membranes, which consist of NB(PS(-b-PLA)-b-MeOPEG miktoarm star terpolymers, PEO, and lithium salt (sodium salt) for AS-LMBs (AS-SMBs) (HEMI-ASPE-Li and HEMI-ASPE-Na, respectively), were prepared by the solution casting technique. To visually reveal the superiority of the HEMI-ASPEs, reference samples of the pure PEO-based ASPEs for AS-LMBs and AS-SMBs (PEO-ASPE-Li and PEO-ASPE-Na) were also prepared with the same salt/polymer mass ratio.…”

Enhanced dielectric performance of polydimethylsiloxane‐based ternary composites films via tailored hydrogen bonds between carbon nanotube and barium titanate as modified fillers

“…Studies suggested that hydrogen bonds can improve the dispersion of the fillers. According to Shen's study, [ 43 ] cellulose@BN has a better shielding effect on polylactic acid due to its more uniform dispersion in the presence of hydrogen bonds. In Jiang's study, [ 44 ] the hydrogen bond was used to regulate the formation of the three‐dimensional boron nitride (3D BN) interconnected network to act as a high thermal conductive network in thermoplastic polyamide‐imide materials.…”

IMPROVEMENT IN MECHANICAL PROPERTIES OF FLEXIBLE POLY(L-LACTIDE)-b-POLYETHYLENE GLYCOL-b-POLY(L-LACTIDE) BIOPLASTIC BY MELT BLENDING WITH BORON NITRIDE

“…This suggests that the BN particles were well compatible with PLLA-PEG-PLLA. In addition, there have no voids between dispersed BN particles and PLLA-PEG-PLLA matrix, which suggests that the interfacial between BN and PLLA-PEG-PLLA was stronger than the PLLA/BN composites [28]. The results indicated the PEG middle-blocks enhanced phase compatibility between BN and PLLA end-blocks.…”

“…This indicates BN has poor shielding effect for improving the thermal stability on PLLA-PEG-PLLA. The movement of polymer chains of composites was restricted and gas barrier property was developed for obstructing the diffusion of decomposition products to improve thermal stability of polymer composites [28].…”