Phase morphology evolution and thermally conductive networks of immiscible polymer blends

Abstract

The selective distribution of fillers in multi-phase polymer blends was dramatically studied to deal with thermal management fields issues. Concerning thermodynamic and kinetic effects of fillers on immiscible polymer blends, the compatibilization of fillers on phase morphology evolution and final construction of thermal conductive pathways were rarely discussed. In this work, BN fillers and polar dispersed phase were introduced into PE through various processing methods. The result showed that filler-coated shell was formed around the larger-sized dispersed phase, thereby forming more thermal conductivity network with other fillers in the two-step processing composites. When the BN content was 20 phr, the thermal conductivity was 0.8271 W/(mÁK) for PE/PA6/BN-two steps composites, which was 95.48% higher than that of PE/PA6 composites. From the perspective of the regulation of the morphological structure of the dispersed phase, this study can provide methods and basic data for improving the thermal conductivity of incompatible polymer blends.

Highly Thermally Conductive Yet Electrically Insulative Polycarbonate Composites with Oriented Hybrid Networks Assisted by High Shear Injection Molding

“…Figure 6c,d indicates that there is an obvious reduction of the values of tan 𝛿 and a shear thinning behavior with respect to frequency for PC/BN/CNT2 composites when compared with that of PC/BN counterparts, which is characteristic of solid-like response behavior. [33] Thus, it can be concluded that physically interconnected network can be readily formed with the introduction of a small amount of CNTs (2 wt%) in PC/BN composites, which is viable for improving the 𝜆 of polymer composites.…”

“…The testing voltage was 100 V. Dielectric measurement was performed over a frequency range of 10 1 -10 6 Hz by a Novocontrol Concept 50 system which was equipped with an Alpha impedance analyzer (Novocontrol Technologies GmbH & Co. KG, Germany). [32][33][34][35][36][37][38][39][40][41] d) Schematic diagram of heat conduction mechanism.…”

“…b) The enhancement of 𝜆 for PC/BN and PC/BN/CNT composites when compared with pure PC. c) A comparison of 𝜆 reported in this work with literature values in relation to filler content [32][33][34][35][36][37][38][39][40][41]. d) Schematic diagram of heat conduction mechanism.…”

h-BN Modification Using Several Hydroxylation and Grafting Methods and Their Incorporation into a PMMA/PA6 Polymer Blend

“…For increasingly significant TC of polymer composites, an effective strategy consists of forming percolated filler networks within the polymer. When reaching the percolation threshold, the heat transfer will be more efficient while the interfacial thermal resistance will be minimized [20,24,41,[53][54][55][56][57][58][59][60]. This morphology can be obtained by dispersing the fillers in one of the two co-continuous phases of an immiscible polymer blend.…”