Leakage-Proof and Malleable Polyethylene Wax Vitrimer Phase Change Materials for Thermal Interface Management

2021 ◽  
Author(s):  
Li-Mei Peng ◽  
Zhao Xu ◽  
Wei-Yu Wang ◽  
Xing Zhao ◽  
Rui-Ying Bao ◽  
...  
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Interface Management ◽  
Thermal Interface ◽  
Polyethylene Wax

scholarly journals Expanded Graphite/Paraffin/Silicone Rubber as High Temperature Form-stabilized Phase Change Materials for Thermal Energy Storage and Thermal Interface Materials

Materials ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 894 ◽  
Author(s):  
Yafang Zhang ◽  
Wang Li ◽  
Juhua Huang ◽  
Ming Cao ◽  
Guoping Du
Keyword(s):  
Energy Storage ◽  
Phase Change ◽  
Latent Heat ◽  
Silicone Rubber ◽  
Phase Change Materials ◽  
Expanded Graphite ◽  
Thermal Interface Materials ◽  
Thermal Interface ◽  
Excellent Thermal Stability ◽  
Interface Materials

In this work, expanded graphite/paraffin/silicone rubber composite phase-change materials (PCMs) were prepared by blending the expanded graphite (EG), paraffin wax (PW) and silicone rubber (SR) matrix. It has been shown that PW fully penetrates into the three dimensional (3D) pores of EG to form the EG/PW particles, which are sealed by SR and evenly embedded in the SR matrix. As a result of the excellent thermal stability of SR and the capillary force from the 3D pores of EG, the EG/PW/SR PCMs are found to have good shape stability and high reliability. After being baked in an oven at 150 °C for 24 h, the shape of the EG/PW/SR PCMs is virtually unchanged, and their weight loss and latent heat drop are only 7.91 wt % and 11.3 J/g, respectively. The latent heat of the EG/PW/SR composites can reach up to 43.6 and 41.8 J/g for the melting and crystallizing processes, respectively. The super cooling of PW decreased from 4.2 to 2.4 due to the heterogeneous nucleation on the large surface of EG and the sealing effect of the SR. Meanwhile, the thermal conductivity of the EG/PW/SR PCMs reaches 0.56 W·m−1·K−1, which is about 2.8 times and 3.73 times of pure PW and pristine SR, respectively. The novel EG/PW/SR PCMs with superior shape and thermal stabilities will have a potential application in heat energy storage and thermal interface materials (TIM) for electronic devices.

3-Omega Measurements of Vertically Oriented Carbon Nanotubes on Silicon

2005 ◽  
Vol 128 (11) ◽  
pp. 1109-1113 ◽  
Author(s):  
X. Jack Hu ◽  
Antonio A. Padilla ◽  
Jun Xu ◽  
Timothy S. Fisher ◽  
Kenneth E. Goodson
Keyword(s):  
Carbon Nanotubes ◽  
Phase Change ◽  
Silicon Substrate ◽  
Phase Change Materials ◽  
Interface Structure ◽  
Next Generation ◽  
Thermal Interface ◽  
Omega Method ◽  
3 Omega ◽  
3 Omega Method

An exploratory thermal interface structure, made of vertically oriented carbon nanotubes directly grown on a silicon substrate, has been thermally characterized using a 3-omega method. The effective thermal conductivities of the carbon nanotubes (CNT) sample, including the effects of voids, are found to be 74W∕mK to 83W∕mK in the temperature range of 295K to 323K, one order higher than that of the best thermal greases or phase change materials. This result suggests that the vertically oriented CNTs potentially can be a promising next-generation thermal interface solution. However, fairly large thermal resistances were observed at the interfaces between the CNT samples and the experimental contact. Minimizing these contact resistances is critical for the application of these materials.

POLYETHYLENE WAX/EPDM BLENDS AS SHAPE-STABILIZED PHASE CHANGE MATERIALS FOR THERMAL ENERGY STORAGE

2017 ◽  
Vol 90 (3) ◽  
pp. 575-584 ◽  
Author(s):  
A. Dorigato ◽  
M.V. Ciampolillo ◽  
A. Cataldi ◽  
M. Bersani ◽  
A. Pegoretti
Keyword(s):  
Energy Storage ◽  
Phase Change ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Phase Change Materials ◽  
Tensile Tests ◽  
Rubber Matrix ◽  
Elevated Concentration ◽  
Melt Mixing ◽  
Polyethylene Wax

ABSTRACT Various amounts of a paraffinic wax were dispersed by melt mixing in an ethylene/propylene diene monomers (EPDM) rubber matrix. The resulting compounds were then vulcanized to obtain shape-stabilized rubbery phase change materials for thermal energy storage. The addition of the paraffinic wax induced a retardation in the vulcanization kinetics of the EPDM matrix. Calorimetric measurements evidenced how the homogenous distribution of the wax domains within the rubber, confirmed by electron microscopy observations, allowed for retaining the melting enthalpy of the neat paraffinic wax even at elevated concentration. The thermal energy storage and release capabilities of the investigated compounds were maintained even after various thermal cycles. The incorporation of polyethylene wax had a positive effect (increasing proportionally to its content) on the mechanical properties of the EPDM matrix, as documented from both the dynamical and the quasi-static tensile tests.

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