Flexible substrate based on sandwich-structure hydrocarbon resin/aligned boron nitride composites with high thermal conductivity and low dielectric loss

Wang, Hao; Dong, Jiaojiao; Yao, Yuanqing; Zhang, Qilong; Cheng, Jingqiu; Yang, Hui; Xia, Zhaoyue; Zhang, Yukang; Qin, Xihui

doi:10.1016/j.compscitech.2022.109654

Cited by 14 publications

(4 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 6c presents the infrared thermal images of PI films, intrinsically thermally conductive LC-PI films, ther- The satisfying thermal management of thermally conductive LC-CNT/LC-PI composite films can ensure the operation stability and service life of products and devices. [56,57]…”

Section: Methodsmentioning

confidence: 99%

Electric‐Field‐Induced Alignment of Functionalized Carbon Nanotubes Inside Thermally Conductive Liquid Crystalline Polyimide Composite Films

Ruan,

Shi,

Zhang

et al. 2023

Angew Chem Int Ed

View full text Add to dashboard Cite

The positive liquid crystals, 4'‐heptyl‐4‐biphenylcarbonitrile (7CB), are used to functionalize carbon nanotubes (LC‐CNT), which can be aligned in the liquid crystalline polyimide (LC‐PI) matrix under an alternating electric field to fabricate the thermally conductive LC‐CNT/LC‐PI composite films. The efficient establishment of thermal conduction pathways in thermally conductive LC‐CNT/LC‐PI composite films with a low amount of LC‐CNT is achieved through the oriented alignment of LC‐CNT within the LC‐PI matrix. When the mass fraction of LC‐CNT is 15 wt%, the in‐plane thermal conductivity coefficient (λ∥) and the through‐plane thermal conductivity coefficient (λ⊥) of the LC‐CNT/LC‐PI composite films reach 4.02 W/(m·K) and 0.55 W/(m·K), which are 90.5% and 71.9% higher than those of the intrinsically thermally conductive LC‐PI films respectively, also 28.8% and 5.8% higher than those of the CNT/LC‐PI composite films respectively. Meanwhile, the thermally conductive LC‐CNT/LC‐PI composite films also possess excellent mechanical and heat resistance properties. The Young’s modulus and the heat resistance index are 2.3 GPa and 297.7oC, respectively, which are higher than the intrinsically thermally conductive LC‐PI films and the thermally conductive CNT/LC‐PI composite films under the same amount of CNT.

show abstract

Section: Methodsmentioning

confidence: 99%

Electric‐Field‐Induced Alignment of Functionalized Carbon Nanotubes Inside Thermally Conductive Liquid Crystalline Polyimide Composite Films

Ruan,

Shi,

Zhang

et al. 2023

Angew Chem Int Ed

View full text Add to dashboard Cite

show abstract

“…This facilitates the efficient formation of thermal conduction pathways, bolstering its thermal conductivity with much enhanced effectiveness. [54,55] To this end, hetero-structured AgNWs@BNNS prepared by growing boron nitride nanosheets (BNNS) on the surface of AgNWs via in situ growth method is used as thermally conductive filler in this work, and aramid nanofibers (ANFs), which are widely used in modern military and highend electronic devices, are used as matrix, to fabricate sandwich structured thermally conductive and electrically insulating (BNNS/ANF)-(AgNWs@BNNS)-(BNNS/ANF) (denoted as BAB) composite films by "filtration selfassembly, air spraying, and hot-pressing" method, achieving thermally conductive, electrically insulating, and adaptive camouflage and information encryption functionalities in BAB composite films. Scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS) are performed to analyze and characterize the composition and morphology of BAB composite films.…”

Section: Introductionmentioning

confidence: 99%

Highly Thermally Conductive Aramid Nanofiber Composite Films with Synchronous Visible/Infrared Camouflages and Information Encryption

Han,

Ruan,

et al. 2024

Angewandte Chemie

View full text Add to dashboard Cite

The highly thermally conductive composites that combine visible light/infrared camouflage and information encryption has been endowed with great significance in facilitating the application of 5G communication technology in military fields. This work uses aramid nanofibers (ANF) as the matrix, hetero‐structured silver nanowires@boron nitride nanosheets (AgNWs@BNNS) prepared by in‐situ growth as fillers, which are combined to fabricate sandwich structured thermally conductive and electrically insulating (BNNS/ANF)‐(AgNWs@BNNS)‐(BNNS/ANF) (denoted as BAB) composite films by “filtration self‐assembly, air spraying, and hot‐pressing” method. When the mass ratio of AgNWs@BNNS to BNNS is 1:1 and the total mass fraction is 50 wt%, BAB composite film has the maximum in‐plane thermal conductivity coefficient (λ∥ of 10.36 W/(m·K)), excellent electrical insulation (breakdown strength and volume resistivity of 41.5 kV/mm and 1.21×1015 Ω·cm, respectively) and mechanical properties (tensile strength of 170.9 MPa). 50 wt% BAB composite film could efficiently reduce the equilibrium temperature of the central processing unit (CPU) working at full power, resulting in 7.0oC lower than that of the CPU solely integrated with ANF directly. In addition, BAB composite film boasts adaptive visible light/infrared dual camouflage properties on cement roads and jungle environments, as well as the function of fast encryption of QR code information within 24 seconds.

show abstract

“…The in‐plane TC of the film reached 4.00 W/mK at 5 wt% rGO loading due to the PVA‐rGO interlayer. Wang 38 et al prepared hexagonal boron nitride (h‐BN)‐filled highly elastic styrene ethylene butylene‐styrene (SEBS) composites, which were oriented along the in‐plane direction by hot pressing. A sandwich structure was designed using a pure cyclic olefin copolymer (COC) film as the outer surface layer and SEBS/h‐BN as the middle layer.…”

Section: Introductionmentioning

confidence: 99%

Highly thermally conductive and insulating PET nonwoven fabric/PDMS sandwich composite film by synergism of boron nitride nanosheets and alumina particles

Song

et al. 2023

Polymer Composites

View full text Add to dashboard Cite

The accumulation of heat in electronic devices puts forward an urgent demand for thermal interface materials. It is still a great challenge to achieve the good comprehensive performance of high thermal conductivity (TC), insulation, flexibility and tensile strength. In this work, polyester‐based nonwoven fabric (NWF) was coated with boron nitride nanosheets (BNNS) by dispersion and interfacial reinforcement of cellulose nanofibers to obtain a three‐dimensional thermally conductive network skeleton (BNNS@NWF). The sandwich‐structured composite film was assembled by introducing alumina (Al2O3)/polydimethylsiloxane (PDMS) layers on the top and bottom surfaces of BNNS@NWF using scratch coating and hot pressing processes. The composite film has a high TC of 6.42 W/mK at 45.8 wt% BNNS content, and has excellent insulation with a volume resistivity of 1.06 × 1015 Ω cm. This is due to the long‐range effective thermal conduction path constructed by BNNS, the bridging effect of Al2O3 and the synergistic effect of the two fillers. PDMS helps the composite film maintain good flexibility and good TC stability after 30 bending cycles. The PET nonwoven interlayer gives the composite film good mechanical properties with a tensile strength of 17.5 MPa. This work provides a strategy for the efficient preparation of flexible composite films with high TC and insulation properties, which is of great importance for the development of innovative thermal interface materials.Highlights A sandwich‐structured composite film was prepared by a simple scale‐up method. Al2O3 and BNNS achieves synergistic enhancement of thermal conductivity. The film has a high thermal conductivity of 6.42 W/mK and electrical insulation. The film shows good flexibility, high tensile and thermal management properties.

show abstract

Flexible substrate based on sandwich-structure hydrocarbon resin/aligned boron nitride composites with high thermal conductivity and low dielectric loss

Cited by 14 publications

References 39 publications

Electric‐Field‐Induced Alignment of Functionalized Carbon Nanotubes Inside Thermally Conductive Liquid Crystalline Polyimide Composite Films

Electric‐Field‐Induced Alignment of Functionalized Carbon Nanotubes Inside Thermally Conductive Liquid Crystalline Polyimide Composite Films

Highly Thermally Conductive Aramid Nanofiber Composite Films with Synchronous Visible/Infrared Camouflages and Information Encryption

Highly thermally conductive and insulating PET nonwoven fabric/PDMS sandwich composite film by synergism of boron nitride nanosheets and alumina particles

Contact Info

Product

Resources

About