High orientation structure in UHMWPE/BN composites continuously obtained by elongational flow field leading to superior thermal conductivity. Issue 29 (18th May 2022)

• Record Type: Journal Article
• Authors: He, Guangjian; Lin, Zhihao; Yin, Xiaochun; Feng, Yanhong
• Is Part Of: Journal of applied polymer science. Volume 139:Issue 29(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-05-18
• Subjects: composites -- polyolefins -- structure‐property relationships -- thermal properties; Polymers -- Periodicals; Polymerization -- Periodicals; 668.9
• DOI: 10.1002/app.52640
• Languages: English
• ISSNs: 0021-8995

Abstract

Abstract: Ultra‐high‐molecular‐weight polyethylene/boron nitride (BN) composites have been continuously prepared successfully by eccentric rotor extruder (ERE) based on elongational flow. Optical microscopy (OM), scanning electron microscopy (SEM), x‐ray diffraction (XRD), thermal conductivity test, heat‐dissipation test, and tensile test were performed to investigate the orientation structure, thermal conductivity, mechanical properties, and insulation properties. The orientation factor and thermal conductivity of the composites prepared by ERE were 79.3 and 3.75 W·m −1 ·K −1, which were much higher than those of composites prepared with a torque mixer (14.7 and 2.73 W·m −1 ·K −1, respectively). OM and SEM showed that the BN sheets were in contact inside the composites and formed an efficient thermal conductivity network. Besides, the composites prepared by ERE had satisfactory mechanical and insulation properties (>10 13 Ω·cm). This study provides experimental and theoretical guidance for industrial preparation of polymer/layered‐filler functional composites. Abstract : Ultra‐high‐molecular‐weight polyethylene/boron nitride composites were continuously prepared with a new type of mixing device of an eccentric rotor extruder based on elongational flow. In this mixer, boron nitride can form a continuous structure in composites under elongational stress, which makes composites with both outstanding thermal conductivity and insulation performance.