scholarly journals Carbonization of Polydopamine-Coating Layers on Boron Nitride for Thermal Conductivity Enhancement in Hybrid Polyvinyl Alcohol (PVA) Composites

Polymers ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1410 ◽  
Author(s):  
Youjin Kim ◽  
Jooheon Kim
Keyword(s):  
Thermal Conductivity ◽  
Boron Nitride ◽  
Polyvinyl Alcohol ◽  
Composite Films ◽  
Analytical Techniques ◽  
Conductive Filler ◽  
Sustainable Chemistry ◽  
Conductivity Enhancement ◽  
Nanocrystalline Graphite ◽  
Thermally Conductive

Inspired by mussel adhesion proteins, boron nitride (BN) particles coated with homogeneous polydopamine (BNPDA) were prepared, and through an annealing process, a carbonized PDA layer on the surface of BN was obtained, which exhibited a nanocrystalline graphite-like structure. The effect of carbonization of PDA coating layer on BN particles was characterized by various analytical techniques including SEM, TEM, Raman spectroscopy, and XPS. When the resulting particles were used as a thermally conductive filler for polyvinyl alcohol (PVA) composite films, enhanced thermal conductivity was observed compared to raw BN composite due to the ordered structure and improved solubility in water. Furthermore, the homogeneous dispersion of the filler and excellent flexibility of the modified composite film with 21 wt % filler may be attributed to compatibility with the PVA chain. As the whole fabrication process did not use toxic chemicals (mainly water was used as the solvent), it may contribute to green and sustainable chemistry.

scholarly journals Incorporating MXene into Boron Nitride/Poly(Vinyl Alcohol) Composite Films to Enhance Thermal and Mechanical Properties

Polymers ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 379
Author(s):  
Seonmin Lee ◽  
Jooheon Kim
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Boron Nitride ◽  
Composite Film ◽  
Vinyl Alcohol ◽  
Composite Films ◽  
Poly Vinyl Alcohol ◽  
Thermal And Mechanical Properties ◽  
Conduction Path ◽  
Thermally Conductive

Aggregated boron nitride (ABN) is advantageous for increasing the packing and thermal conductivity of the matrix in composite materials, but can deteriorate the mechanical properties by breaking during processing. In addition, there are few studies on the use of Ti3C2 MXene as thermally conductive fillers. Herein, the development of a novel composite film is described. It incorporates MXene and ABN into poly(vinyl alcohol) (PVA) to achieve a high thermal conductivity. Polysilazane (PSZ)-coated ABN formed a heat conduction path in the composite film, and MXene supported it to further improve the thermal conductivity. The prepared polymer composite film is shown to provide through-plane and in-plane thermal conductivities of 1.51 and 4.28 W/mK at total filler contents of 44 wt.%. The composite film is also shown to exhibit a tensile strength of 11.96 MPa, which is much greater than that without MXene. Thus, it demonstrates that incorporating MXene as a thermally conductive filler can enhance the thermal and mechanical properties of composite films.

Insulating and Thermally Conductive Composite Filled with Boron Nitride Particles

2011 ◽  
Vol 391-392 ◽  
pp. 282-286 ◽  
Author(s):  
Jun Peng Li ◽  
Shu Hua Qi ◽  
Fan Xie
Keyword(s):  
Thermal Conductivity ◽  
Thermal Stability ◽  
Boron Nitride ◽  
Filler Content ◽  
Glass Fibers ◽  
High Surface ◽  
Conductive Filler ◽  
Volume Resistivity ◽  
Conductive Composites ◽  
Thermally Conductive

A new kind of thermally conductive composites reinforced by glass fibers with boron nitride (BN) as thermally conductive filler was prepared in heat press molding. Thermal conductivity of the composites was found to increase with increasing in filler content. But impact strength and flexural strength reach the top point, 385.05KJ/m2 and 912.6481MPa, with content of 50wt% and 20wt% respectively. The thermal conductivity of 0.8385 W/mK was obtained at 50wt% filler content. Experimental dates show that mixed matrix of epoxy (EP) and polyimide (PI) displays high thermal stability and can improve thermal stability compared to pure epoxy obviously at 50wt% PI content. Additionally, the obtained composites possess high surface resistivity and volume resistivity, which are suitable for substrate materials.

Thermally Conductive and Electrically Insulating PVP/Boron Nitride Composite Films for Heat Spreader

2019 ◽  
Vol 2019 (NOR) ◽  
pp. 000001-00005
Author(s):  
Ya Liu ◽  
Nan Wang ◽  
Lilei Ye ◽  
Abdelhafid Zehri ◽  
Andreas Nylander ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Boron Nitride ◽  
Thermal Management ◽  
Hexagonal Boron Nitride ◽  
Composite Films ◽  
High Thermal Conductivity ◽  
Thermally Conductive ◽  
Promising Solution ◽  
Mechanical Pressing ◽  
Insulating Properties

Abstract Thermally conductive materials with electrically insulating properties have been extensively investigated for thermal management of electronic devices. The combined properties of high thermal conductivity, structural stability, corrosion resistance and electric resistivity make hexagonal boron nitride (h-BN) a promising candidate for this purpose. Theoretical studies have revealed that h-BN has a high in-plane thermal conductivity up to 400 - 800 W m−1 K−1 at room temperature. However, it is still a big challenge to achieve high thermally conductive h-BN thick films that are commercially feasible due to its poor mechanical properties. On the other hand, many polymers exhibit advantages for flexibility. Thus, combining the merits of polymer and the high thermal conductivity of h-BN particles is considered as a promising solution for this issue. In this work, orientated PVP/h-BN films were prepared by electrospinning and a subsequent mechanical pressing process. With the optimized h-BN loading, a PVP/h-BN composite film with up to 22 W m−1 K−1 and 0.485 W m−1 K−1 for in-plane and through-plane thermal conductivity can be achieved, respectively. We believe this work can help accelerate the development of h-BN for thermal management applications.

scholarly journals Robust Biomimetic Nacreous Aramid Nanofiber Composite Films with Ultrahigh Thermal Conductivity by Introducing Graphene Oxide and Edge-Hydroxylated Boron Nitride Nanosheet

Nanomaterials ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 2544
Author(s):  
Cenkai Xu ◽  
Chengmei Wei ◽  
Qihan Li ◽  
Zihan Li ◽  
Zongxi Zhang ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Graphene Oxide ◽  
Boron Nitride ◽  
Composite Film ◽  
Performance Enhancement ◽  
Composite Films ◽  
Dielectric Materials ◽  
Boron Nitride Nanosheet ◽  
Brick And Mortar ◽  
Thermally Conductive

Dielectric materials with excellent thermally conductive and mechanical properties can enable disruptive performance enhancement in the areas of advanced electronics and high-power devices. However, simultaneously achieving high thermal conductivity and mechanical strength for a single material remains a challenge. Herein, we report a new strategy for preparing mechanically strong and thermally conductive composite films by combining aramid nanofibers (ANFs) with graphene oxide (GO) and edge-hydroxylated boron nitride nanosheet (BNNS-OH) via a vacuum-assisted filtration and hot-pressing technique. The obtained ANF/GO/BNNS film exhibits an ultrahigh in-plane thermal conductivity of 33.4 Wm−1K−1 at the loading of 10 wt.% GO and 50 wt.% BNNS-OH, which is 2080% higher than that of pure ANF film. The exceptional thermal conductivity results from the biomimetic nacreous “brick-and-mortar” layered structure of the composite film, in which favorable contacting and overlapping between the BNNS-OH and GO is generated, resulting in tightly packed thermal conduction networks. In addition, an outstanding tensile strength of 93.3 MPa is achieved for the composite film, owing to the special biomimetic nacreous structure as well as the strong π−π interactions and extensive hydrogen bonding between the GO and ANFs framework. Meanwhile, the obtained composite film displays excellent thermostability (Td = 555 °C, Tg > 400 °C) and electrical insulation (4.2 × 1014 Ω·cm). We believe that these findings shed some light on the design and fabrication of multifunctional materials for thermal management applications.

scholarly journals Super-compatible functional boron nitride nanosheets/polymer films with excellent mechanical properties and ultra-high thermal conductivity for thermal management

2018 ◽  
Vol 6 (6) ◽  
pp. 1363-1369 ◽  
Author(s):  
Jiemin Wang ◽  
Yuanpeng Wu ◽  
Ye Xue ◽  
Dan Liu ◽  
Xuebin Wang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Boron Nitride ◽  
Polyvinyl Alcohol ◽  
Thermal Management ◽  
Polymer Films ◽  
Composite Films ◽  
High Thermal Conductivity ◽  
Boron Nitride Nanosheets

Super compatible functional boron nitride (FBN) nanosheets and polyvinyl alcohol (PVA) composite films are well fabricated by facile aqueous vacuum filtering.

scholarly journals Hot pressing-induced alignment of hexagonal boron nitride in SEBS elastomer for superior thermally conductive composites

RSC Advances ◽  
2018 ◽  
Vol 8 (45) ◽  
pp. 25835-25845 ◽  
Author(s):  
Cuiping Yu ◽  
Wenbin Gong ◽  
Jun Zhang ◽  
Weibang Lv ◽  
Wei Tian ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Boron Nitride ◽  
Dimensional Stability ◽  
Hot Pressing ◽  
Hexagonal Boron Nitride ◽  
Composite Films ◽  
Conductive Composites ◽  
Thermally Conductive

Orientational hBN/SEBS composite films embued with superior thermal conductivity and improved dimensional stability were prepared by hot-pressing treatment.

scholarly journals Improving the Actuation Speed and Multi-Cyclic Actuation Characteristics of Silicone/Ethanol Soft Actuators

Actuators ◽  
2020 ◽  
Vol 9 (3) ◽  
pp. 62 ◽  
Author(s):  
Boxi Xia ◽  
Aslan Miriyev ◽  
Cesar Trujillo ◽  
Neil Chen ◽  
Mark Cartolano ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Short Term Memory ◽  
Conductive Filler ◽  
Thermally Driven ◽  
Thermally Conductive ◽  
Ethanol Evaporation ◽  
Long Short Term Memory ◽  
Soft Actuators ◽  
Robotic Applications ◽  
Soft Composite

The actuation of silicone/ethanol soft composite material-actuators is based on the phase change of ethanol upon heating, followed by the expansion of the whole composite, exhibiting high actuation stress and strain. However, the low thermal conductivity of silicone rubber hinders uniform heating throughout the material, creating overheated damaged areas in the silicone matrix and accelerating ethanol evaporation. This limits the actuation speed and the total number of operation cycles of these thermally-driven soft actuators. In this paper, we showed that adding 8 wt.% of diamond nanoparticle-based thermally conductive filler increases the thermal conductivity (from 0.190 W/mK to 0.212 W/mK), actuation speed and amount of operation cycles of silicone/ethanol actuators, while not affecting the mechanical properties. We performed multi-cyclic actuation tests and showed that the faster and longer operation of 8 wt.% filler material-actuators allows collecting enough reliable data for computational methods to model further actuation behavior. We successfully implemented a long short-term memory (LSTM) neural network model to predict the actuation force exerted in a uniform multi-cyclic actuation experiment. This work paves the way for a broader implementation of soft thermally-driven actuators in various robotic applications.

Alignment of Boron Nitride Nanotubes in Polymeric Composite Films for Thermal Conductivity Improvement

2010 ◽  
Vol 114 (10) ◽  
pp. 4340-4344 ◽  
Author(s):  
Takeshi Terao ◽  
Chunyi Zhi ◽  
Yoshio Bando ◽  
Masanori Mitome ◽  
Chengchun Tang ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Boron Nitride ◽  
Composite Films ◽  
Polymeric Composite ◽  
Boron Nitride Nanotubes

Thermal Conductivity Enhancement of Coaxial Carbon@Boron Nitride Nanotube Arrays

2017 ◽  
Vol 9 (17) ◽  
pp. 14555-14560 ◽  
Author(s):  
Lin Jing ◽  
Majid Kabiri Samani ◽  
Bo Liu ◽  
Hongling Li ◽  
Roland Yingjie Tay ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Boron Nitride ◽  
Thermal Conductivity Enhancement ◽  
Nanotube Arrays ◽  
Boron Nitride Nanotube ◽  
Conductivity Enhancement
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