Study on double⁃segregated polyethylene/graphene composites with high thermal conductivity

doi:10.19491/j.issn.1001-9278.2022.01.005

Abstract

Abstract:

Polyethylene?based composites （N?PE?HD/P?GNPs） with a honeycomb graphene framework were prepared through electrostatic induction self?assembly and hot pressing process employing poly（diallyldimethylammonium chloride）?modified graphene nanosheets （P?GNPs） and polystyrene sulfonate?modified polyethylene particles （N?PE?HD） as raw materials. The morphology， microstructure， thermal conductivity， and mechanical properties of the composites were characterized using Fourier?transform infrared spectrometer， scanning electron microscopy， thermal conductivity tester， and electronic tensile testing machine. The results indicated that the formation of a continuous graphene framework effectively improved the thermal conductivity of the polyethylene?based composites. The N?PE?HD/P?GNPs system exhibited a thermal conductivity of 2.51 W/（m·K） with the addition of 20 wt % P?GNPs. This result is higher than 1.71 W/（m·K） of PE?HD/GNPs system by 1.47 times and 0.44 W/（m·K） of pure PE?HD matrix by 5.70 times. The N?PE?HD/P?GN Ps composites also showed tensile strength of 29.1 MPa， Young's modulus of 114 MPa， and elongation at break of 48 %. Their melting point and thermal decomposition temperature were determined to be 135.2 and 458 ℃， which are higher than those of pure PE?HD by 2 ℃ and 11 °C， respectively.

Key words: graphene, polyethylene, thermal conductivity, mechanical property, composite

CLC Number:

TQ325.1⁺2

WANG Qiyang, YANG Xiao, CHEN Jihuan, HE Yuexing, YANG Dongmei, HU Boyang, GUO Hong, LI Baoan. Study on double⁃segregated polyethylene/graphene composites with high thermal conductivity[J]. China Plastics, 2022, 36(1): 32-41.

Figures/Tables 15

Fig.1. Preparation process of N?PE?HD/P?GNPs composite

Fig.2. FTIR of GNPs， P?GNPs， PE?HD and N?PE?HD

Fig.3. Zeta potential of GNPs， P?GNPs， PE?HD and N?PE?HD

Fig.4. Dispersion state of GNPs， P?GNPs， PE?HD， N?PE?HD and N?PE?HD/P?GNPs in ethanol solution after standing for 120 min

Fig.5. AFM of P?GNPs as well as SEM of N?PE?HD and N?PE?HD/P?GNPs microspheres

Fig.6. Particle size distribution of P?GNPs and N?PE?HD

Fig.7. SEM of cross?section of pure PE?HD and N?PE?HD/P?GNPs composites

Fig.8. Thermal conductivity of PE?HD/GNPs and N?PE?HD/P?GNPs composites

Fig.9. Illustration of thermal?conductive pathways of PE?HD/GNPs and N?PE?HD/P?GNPs composites

Fig.10. Surface temperature variations of different samples during constant temperature heating

填料	聚合物	填充量/%	热导率/W·（m·K）^-1	年份	参考文献
石墨烯	氰酸酯	20.0	0.339	2018	［25］
还原氧化石墨烯	环氧树脂	3.0	0.670	2019	［26］
改性石墨烯	聚偏氟乙烯	16.0	0.679	2019	［27］
石墨烯	PE?HD	10.0	1.130	2019	［28］
石墨烯/碳纳米管	氯乙烯/氟乙烯共聚物	0.3	1.300	2019	［29］
碳纳米管/石墨烯	聚偏氟乙烯	10.0	1.460	2019	［30］
定向石墨烯管	聚二甲基硅氧烷	4.5	1.700	2019	［31］
石墨烯	环氧树脂	20.0	1.730	2019	［32］
石墨烯凝胶	环氧树脂	1.11	2.690	2019	［33］
石墨烯/氮化硼	环氧树脂	5.0	0.649	2020	［34］
石墨烯/碳化硅	环氧树脂	3.5	0.708	2020	［35］
石墨烯	聚二甲基硅氧烷/聚偏氟乙烯	15.0	2.180	2020	［36］
石墨烯	酚酞聚芳醚酮环氧树脂	0.5	0.371	2021	［37］
石墨烯/氮化硼	聚丙烯	39.0	1.320	2021	［38］
改性石墨烯	PE?HD	20.0	2.510	2022	本文

Tab.1. Comparison of thermal conductivity of polymer/graphene composites reported in recent literatures

Fig.11. Thermal conductivity fitting curve of PE?HD/GNPs and N?PE?HD/P?GNPs composites

Fig.12. Tensile strength， Young's modulus and elongation at break of N?PE?HD composites with different filler loadings

Fig.13. Melting temperature of N?PE?HD composites with different addition of P?GNPs

Fig.14. TG curves of P?GNPs， N?PE?HD and N?PE?HD/P?GNPs

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