Preparation of polypropylene-based thermally conductive composites via multiple injection compression molding method. (November 2022)

• Record Type: Journal Article
• Authors: Li, Chenglin; Du, Qingyuan; Ru, Yue; Zhang, Hao; An, Yi; Liu, Jiaming; Wu, Daming; Gao, Dali; Sun, Jingyao
• Is Part Of: Composites communications. Volume 35(2022)
• Publication Date: 2022-11
• Subjects: Thermally conductive composites -- Multiple injection compression molding -- Mechanical property
• DOI: 10.1016/j.coco.2022.101331
• Languages: English
• ISSNs: 2452-2139

Abstract

Abstract: With the increasing power consumption of electronic devices, this leads to a huge challenge in terms of heat dissipation. In order to solve the problem of heat dissipation in electronic equipment and to improve the stability and life of electronic equipment. This paper reports polypropylene (PP)/carbon fiber (CF)/Al2 O3, PP/CF, PP/CF/SiO2 composites with excellent properties, which are prepared by two different methods: injection molding (IM) and injection compression (IC). The PP/CF/Al2 O3 and PP/CF/SiO2 composites contain a constant 5 wt% of Al2 O3 and SiO2 fillers. Different processing methods are used to prepare the composites in order to investigate the effect of different processing methods on the mechanical properties and thermal conductivity of the composites. The PP/CF/Al2 O3 composite (0.475 W/(m⋅K)) prepared by IC method (6 × 0.5 mm) has good thermal conductivity, 15.90% higher than that of the PP/CF/Al2 O3 composite (0.410 W/(m⋅K)) prepared by IM method. In addition, the PP/CF/Al2 O3 composite has good mechanical properties (tensile strength and elongation at break are 4.22% and 14.176 MPa respectively). This method of IM has great potential for the continuous production of thermally conductive composites. Graphical abstract: Image 1 Highlights: The influences of injection molding and injection compression on thermal conductivity of PP-based composites are investigated. Mechanical properties and thermal conductivity of samples can be improved by controlling the compression cycle number. The influence of different rigid particles on properties of PP-based composites are investigated.