Hybrid carbon filled thermoplastic composites: synergistic effect of synthetic graphite and graphene nanoplatelets on thermal and mechanical properties of polyamide 4.6

In comparison with conventional polyamides, polyamide 4.6 is known as one of the high-temperature polyamides due to polymer chain constituents which also enhances its dimensional stability, creep resistance, and chemical resistance. The effect of hybrid synthetic graphite and graphene nanoplatelets fillers on thermal conductivity of polyamide 4.6 based composites was investigated in this study. Synthetic graphite and graphene nanoplatelets filled polyamide 4.6 based composites were fabricated using a twin-screw extruder. The variations on electrical, mechanical, thermal, and morphological properties were also examined. The highest in-plane and through-plane thermal conductivity values were obtained for hybrid 40 wt.% synthetic graphite and 5 wt.% graphene nanoplatelets filled composites as 21.65 and 4.04 W/mK, respectively. It was reported that the usage of hybrid carbon fillers in polyamide 4.6 leads to better thermal conductivity value..Scientific and Technological Research Council of Turkey; Turkiye Bilimsel ve Teknolojik Arastirma Kurumu [117M088]The authors are grateful for the funding from the Scientific and Technological Research Council of Turkey; Turkiye Bilimsel ve Teknolojik Arastirma Kurumu [Project no: 117M088]

Enhanced in-plane and through-plane thermal conductivity and mechanical properties of polyamide 4.6 composites loaded with hybrid carbon fiber, synthetic graphite and graphene

Polyamide 4.6 has excellent properties, such as high temperature resistance, crystallinity, fatigue resistance, melting temperature, excellent creep resistance, toughness, and good wear properties, but low thermal conductivity values. For this reason, its use in thermal applications has been limited. In this study, its use in thermal applications can be increased by increasing its thermal conductivity with carbon-based fillers and reinforcements added to the PA46 structure. The aim of this study is to examine the carbon fiber (CF), synthetic graphite (SG) and graphene nanoplatelet (G) loading on the mechanical, thermal, physical, and electrical properties of polyamide 4.6, which are produced using co- rotating twin-screw extrusion. Tensile and flexural strength of polyamide 4.6 increased with the addition of CF at all weight fractions. The highest electrical conductivity value was measured as 4.01 S/cm in PA46-20CF-20SG-3G composite material. The highest in-plane thermal conductivity achieved in this study at 20 wt% CF, 20 wt% synthetic graphite, and 5 wt% graphene loading was 20.43 W/mK. However, the highest through-plane thermal conductivity value was obtained to be 4.19 W/mK at 20 wt% CF. Graphene and synthetic graphite are more efficient to increase the in-plane thermal conductivity, while CF is more efficient to increase the through-plane thermal conductivity.scientific and technological research council of Turkey (TUBITAK) [117M088]The scientific and technological research council of Turkey (TUBITAK), Grant/Award Number: Project No: 117M08

Comparison of the Thermal and Mechanical Properties of Poly(phenylene sulfide) and Poly(phenylene sulfide)-Syndiotactic Polystyrene-Based Thermal Conductive Composites

Syndiotactic polystyrene (SPS) has attracted considerable attention recently due to its high melting temperature, low cost, and relatively low density value. The aim of the study is to reveal whether a blend of PPS and SPS (PPS-SPS) can be used instead of PPS for high thermal stability, high mechanical performance, and high thermal conductive material applications. For this aim, poly(phenylene sulfide)/syndiotactic polystyrene-based carbon-loaded composite materials were prepared using a twin screw extruder. Two carbon based materials, carbon fiber (CF) and synthetic graphite (SG), were used to improve the mechanical properties and thermal conductivity of the PPS-SPS blends. Through-plane conductivity values of PPS-30SG-10CF and PPS-SPS-30SG-10CF were obtained to be 13.67 and 12.92 W/mK, with densities of 1.55 and 1.50 g/cm3, respectively. It was demonstrated that PPS-SPS blend-based carbon-loaded composites have great potential to be used in thermal management applications with the advantages of relatively low cost and lightweight compared to PPS-based composites

Thermal Conductivity and Mechanical Properties of Synthetic Graphite Loaded Polyphenylene Sulfide Composites

35th International Conference of the Polymer-Processing-Society (PPS) -- MAY 26-30, 2019 -- TURKEYWOS: 000555285800033It is known that polyphenylene sulfide (PPS), which is a semi-crystalline aromatic polymer, exhibits high thermal stability, outstanding chemical resistance, and excellent flame retardancy properties. However PPS has a poor electrical and thermal conductivity, which limits their uses in some applications where thermal conductivity is required for heat dissipation or storing efficiently. in order to improve thermal conductivity of Polyphenylene sulfide (PPS), PPS-Synthetic graphite (SG) composites were produced by using twin-screw extrusion. SG at different weight fractions (10, 30, 50%) were loaded into PPS and thermal conductivity values of composites were measured in plane and through plane directions. the effect of loading SG into PPS on the mechanical properties of PPS was determined by using three-point bending tests. Charpy tests were conducted to determine the impact properties of SG loaded PPS composites. the effect of SG loading on density of PPS was also determined. Differentials canning calorimetry analyses of SG loaded PPS composites were carried out to determine Cp values. When 50 wt% SG was loaded into PPS, in plane and through plane thermal conductivity of PPS were obtained to be 6.54 and 1.5 W/mK, respectively. Considering ISO 180 standard, charpy-notched impact strengths of PPS-10SG, PPS-30SG, and PPS-50SG are determined to be 9.69, 8.75, and 7.9 kJ/m2 respectively. From conducted result it was concluded that in spite of loading of SG, the mechanical properties of PPS has not affected greatly.Polymer Proc Soc, Sabanci UnivTUBITAK "The Scientific and Technical Research Council of Turkey"Turkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [117M088]The authors would like to thank TUBITAK "The Scientific and Technical Research Council of Turkey" for financial support under Project Number 117M088

Investigation of thermal and mechanical properties of synthetic graphite and recycled carbon fiber filled polypropylene composites

###EgeUn###Suppressing the through-plane component of the thermal conductivity caused by synthetic graphite (SG) alignment was decreased by loading of recycled carbon fiber (CF) into SG loaded polypropylene (PP) composites. The effect of CF loading into SG loaded PP composites on thermal stability, viscoelastic, and morphological properties were also investigated by thermogravimetric analysis, dynamic mechanical analysis, and scanning electron microscopy, respectively. CF loading into SG loaded PP composites increased through-plane conductivity considerably rather than in-plane conductivity. 20 wt% CF additions into 50 wt% SG increased through-plane and in-plane thermal conductivity values by 12.5 and 1.3 times, respectively. Storage and loss moduli of composites significantly increased with the increasing fiber weight content, particularly 20 wt%. Besides, while SG decreases the mechanical properties of PP, CF loading into SG loaded PP composites increased the mechanical properties.Research Foundation of Izmir Katip Celebi University [2016-GAP-MUMF-0030]The authors gratefully acknowledge the financial support given by the Research Foundation of Izmir Katip Celebi University (Project No: 2016-GAP-MUMF-0030)