A vertically aligned anisotropic boron nitride nanosheet (BNNSs)/polyvinyl alcohol (PVA) composite aerogel with ultra-low thermal conductivity prepared by the prefreeze-freeze-drying method for efficient thermal management

Zhang, Yuan; Li, Yifan; Lei, Qiuxing; Zhu, Dahai; Zhang, Wenzhe; Wu, Xinfeng; Xie, Huaqing; Yu, Wei

doi:10.1016/j.mtcomm.2023.106742

Cited by 6 publications

(1 citation statement)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…19 Chen 20 stabilities, microstructures, and flammabilities were systematically investigated. Zhang 21 et al fabricated a composite aerogel comprising vertically aligned anisotropic boron nitride nanosheets (BNNSs) and poly(vinyl alcohol) (PVA) using the freeze-drying technique. The resulting composite aerogel exhibited good electrical insulation and flame-retardant properties.…”

Section: Introductionmentioning

confidence: 99%

Poly(vinyl alcohol) Composite Aerogel toward Lightweight, Remarkable Flame Retardancy, and Thermal Insulation Properties by Incorporating Carbon Nanohorns and Phytic Acid

Xu,

Ao,

de la Vega

et al. 2024

ACS Appl. Polym. Mater.

View full text Add to dashboard Cite

In this work, an aerogel with excellent flame retardancy, enhanced compression modulus, and efficient thermal insulation was developed from poly(vinyl alcohol) (PVA), biobased phytic acid (PA), and single-walled carbon nanohorns (SWCNHs). The microstructural evolution of the freeze-dried PVA/PA/SWCNH composite aerogels revealed that varied amounts of phytic acid could influence the three-dimensional architecture. Especially, when the concentration of PA was 1.5%, the PVA/PA/SWCNHs composite aerogel with a tightly arranged "short tubes" structure had a high compressive modulus of 2.02 MPa, corresponding to the specific modulus of 20.2 MPa cm 3 /g. Compared to the PVA/SWCNHs aerogel, the PVA/PA/SWCNHs composite aerogels showed better fire retardancy, as confirmed by limited oxygen index (LOI) tests and cone calorimetry (CC) tests. Notably, the introduction of phytic acid at 1.5% resulted in LOI values up to 49.8 ± 0.1% and the pHRR and THR of the PVA/PA/SWCNHs composite aerogel were dramatically reduced by 74.3 and 81.0%, respectively. In addition, PVA/PA/SWCNHs composite aerogels with different concentrations of phytic acid exhibited excellent thermal insulation performance with a slightly lower thermal conductivity (32.2− 46.9 mW/(m K)) and resisted the ∼1300 °C flame. Meanwhile, the synergistic flame retardancy between SWCNHs and phytic acid was also confirmed by the analysis of the char residues and gas-phase products. These unique characteristics make the aerogel a promising multifunctional candidate for applications in aviation, aerospace, and other fields.

show abstract

Section: Introductionmentioning

confidence: 99%

Poly(vinyl alcohol) Composite Aerogel toward Lightweight, Remarkable Flame Retardancy, and Thermal Insulation Properties by Incorporating Carbon Nanohorns and Phytic Acid

Xu,

Ao,

de la Vega

et al. 2024

ACS Appl. Polym. Mater.

View full text Add to dashboard Cite

show abstract

Excellent thermal conductive epoxy composites via adding UHMWPE fiber obtained by hot drawing method

Shi,

Jiang,

Wang

et al. 2024

Polymer Composites

View full text Add to dashboard Cite

The continuous updating and iteration of electronic devices brings about a significant accumulation of heat. It is urgent to enhance the thermal properties of polymer‐based composites to alleviate the heat dissipation problem in the microelectronics industry. In this paper, the hot drawing process was introduced to increase the crystallinity of ultra‐high molecular weight polyethylene (UHMWPE) fiber and improve its thermal conductivity. The ultra‐high molecular weight polyethylene fiber/epoxy resin (UHMWPE fiber/Epoxy) composites with high thermal conductivity were prepared by compositing UHMWPE fiber with epoxy resin under vacuum conditions. Due to the good crystallinity of the UHMWPE fiber (86%), an efficient thermal conduction path is provided for phonons in the axial direction along the fibers. The results show that the thermal conductivity of the composites reaches a maximum of 3.51 W/mK (in‐plane), which is 17.47 times higher than that of the epoxy resin (0.19 W/mK). The thermography pictures indicate that the composites have better heat transfer capacity with an increase in the draw ratio (λ). In addition, the composites also have the characteristics of low density and low electrical conductivity. These researches will provide a new idea for the preparation of all‐polymer composites with high thermal properties.Highlights A hot drawing process was introduced to increase the crystallinity of UHMWPE fiber for improving thermal conductivity. High crystallinity facilitates the reduction of phonon scattering and the transmission of thermal energy by phonons. The obtained polymer composites exhibit an ultra‐high in‐plane thermal conductivity.

show abstract

Thermal conductivity and heat transfer mechanism of epoxy composites constructing by carbon fiber felt with three‐dimensional layered structure

Shi,

Jiang,

Cao

et al. 2024

Polymer Composites

View full text Add to dashboard Cite

The preparation of lightweight polymer‐based composites with high thermal conductivity is an urgent requirement for thermal management applications. In this work, carbon fiber felt (CFF) with three‐dimensional (3D) layered structure was firstly prepared based on papermaking method. Then, high in‐plane thermal conductivity (TC) Epoxy resin/graphitized carbon fiber felt (Epoxy/G‐CFF) composites were prepared by graphitized CFF with different layers under vacuum assistance. The effect of graphitization on the thermal property was investigated, and the practical heat transfer behavior was analyzed. The results show that the Epoxy/G‐CFF composites exhibit the highest in‐plane thermal conductivity of 1.88 W/mK at 8.5 wt% loading, which is 889.47% higher than that of pure Epoxy. It represents the achievement of enhancing the thermal performance of polymer‐based composites with low additions. More importantly, the composites still exhibit low density and strong thermal management capability. This suggests that Epoxy/G‐CFF composites have promising applications in the thermal management field.Highlights The carbon fiber felt (CFF) with three‐dimensional (3D) layered structure was firstly prepared based on papermaking method. The graphitization process significantly increases the grain size and shortens the layer spacing, contributing to the comprehensive properties of G‐CFF. The Epoxy/G‐CFF composites exhibit the highest in‐plane thermal conductivity of 1.88 W/mK at 8.5 wt% loading.

show abstract

A vertically aligned anisotropic boron nitride nanosheet (BNNSs)/polyvinyl alcohol (PVA) composite aerogel with ultra-low thermal conductivity prepared by the prefreeze-freeze-drying method for efficient thermal management

Cited by 6 publications

References 48 publications

Poly(vinyl alcohol) Composite Aerogel toward Lightweight, Remarkable Flame Retardancy, and Thermal Insulation Properties by Incorporating Carbon Nanohorns and Phytic Acid

Poly(vinyl alcohol) Composite Aerogel toward Lightweight, Remarkable Flame Retardancy, and Thermal Insulation Properties by Incorporating Carbon Nanohorns and Phytic Acid

Excellent thermal conductive epoxy composites via adding UHMWPE fiber obtained by hot drawing method

Thermal conductivity and heat transfer mechanism of epoxy composites constructing by carbon fiber felt with three‐dimensional layered structure

Contact Info

Product

Resources

About