Abstract
UHMWPE/BN composites were prepared by solvent mixing (SM) in this work, then were characterized by scanning electron microscope (SEM), Raman mapping, differential scanning calorimeter (DSC), thermogravimetric analysis (TG), and thermal conductivity meter to study the morphology, filler distribution, segregated structure, and thermal stability as well as thermal conductivity. Compared to the traditional melt mixing (MM), SM followed by molding contributes to the construction of segregated structures in UHMWPE composite. This segregated structure can greatly improve the thermal conductivity of the composites. The segregated structure of composites prepared by MM is destroyed by shearing. Moreover, the thermal stability of composites by SM is improved with the increment of BN content, which is better than that of samples by MM, probably resulting from the barrier function of the segregated structure.
Highlights
Ultra high molecular weight polyethylene (UHMWPE) is an engineering plastic that is widely used in aerospace, defense military, biological joints, pipeline transportation, etc., due to its outstanding wear resistance, excellent impact resistance, as well as good biocompatibility [1]
In addition to adjust the alignment of polymer chains, UHMWPE doped with the thermally conductive llers has gained signi cant attention. e improved thermal conductivity of UHMWPE composites have been obtained through doping of llers, such as aluminium nitride (AlN) [7, 8], boron nitride (BN) [9], silicon nitride (Si3N4) [10], silicon carbide (SiC) [11], and aluminium oxide [12]
The bers on the surface of UHMWPE particles by melt mixing (MM) are melted due to the high temperature. e morphologies of the coreshell UHMWPE/BN particles with 40 wt% BN through two mixing methods are shown in Figures 1(d) and 1(f)
Summary
Ultra high molecular weight polyethylene (UHMWPE) is an engineering plastic that is widely used in aerospace, defense military, biological joints, pipeline transportation, etc., due to its outstanding wear resistance, excellent impact resistance, as well as good biocompatibility [1]. Some researchers manipulate the polymer chain alignment to form orientations [2,3,4] and the high crystallinity [5, 6] in the matrix to get high thermal conductivity of UHMWPE. In addition to adjust the alignment of polymer chains, UHMWPE doped with the thermally conductive llers has gained signi cant attention. E improved thermal conductivity of UHMWPE composites have been obtained through doping of llers, such as aluminium nitride (AlN) [7, 8], boron nitride (BN) [9], silicon nitride (Si3N4) [10], silicon carbide (SiC) [11], and aluminium oxide [12]. UHMWPE cannot be extruded and injection molded like other thermoplastic materials at temperatures above its melting temperature due to its extremely high melt viscosity. The processing of this material is basically limited to compression molding [13,14,15] and ram extrusion
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