Bioinspired modification strategy to improve thermal conductivity and dielectric constant of natural rubber composite for thermal management applications

2021 ◽  
pp. 51949
Author(s):  
Mengnan Ruan ◽  
Dandan Guo ◽  
Defu Zhu ◽  
Zhifeng Liu
Keyword(s):  
Thermal Conductivity ◽  
Dielectric Constant ◽  
Natural Rubber ◽  
Thermal Management ◽  
Rubber Composite

A novel environmentally friendly boron nitride/lignosulfonate/natural rubber composite with improved thermal conductivity

2020 ◽  
Vol 8 (14) ◽  
pp. 4801-4809 ◽  
Author(s):  
Dong An ◽  
Shuaishuai Cheng ◽  
Can Jiang ◽  
Xiaoyuan Duan ◽  
Bo Yang ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Boron Nitride ◽  
Natural Rubber ◽  
Thermal Management ◽  
Heat Dissipation ◽  
Environmentally Friendly ◽  
Rubber Composite

Polymer-based thermal management materials have drawn much attention in the last few years because of the increasing heat dissipation challenges of advanced modern electronics.

Solar reflectance, surface adhesion, and thermal conductivity of wood/natural rubber composite sheet with Tio2/polyurethane topcoat for roofing applications

2012 ◽  
Vol 18 (3) ◽  
pp. 184-191 ◽  
Author(s):  
Natita Hamaviriyapornwattana ◽  
Narongrit Sombatsompop ◽  
Teerasak Markpin ◽  
Apisit Kositchaiyong ◽  
Ekachai Wimolmala
Keyword(s):  
Thermal Conductivity ◽  
Natural Rubber ◽  
Surface Adhesion ◽  
Composite Sheet ◽  
Solar Reflectance ◽  
Rubber Composite

Energy-Absorption Ability of Embedding Whisker Alumina Fiber into Natural Rubber Composite for Insulation Applications

2020 ◽  
Vol 987 ◽  
pp. 47-52
Author(s):  
Wasan Leelawanachai ◽  
Nattapol Dedruktip ◽  
Nuchnapa Tangboriboon
Keyword(s):  
Thermal Conductivity ◽  
Natural Rubber ◽  
Sound Absorption ◽  
Polymer Matrix Composites ◽  
Fiber Composite ◽  
Sound Level ◽  
Curing Temperature ◽  
Rubber Compound ◽  
Rubber Composite ◽  
Composite Samples

Natural rubber is an elastomeric material to make rubber products such as toys, households, automobiles, wheel tires, medical and health care products. Natural rubber compound is one kind of polymer matrix composites (PMCs) composed of natural rubber compound acted as a matrix phase and filler acted as a dispersed or reinforcement phase. There are many kinds of fillers used in the PMCs in terms of particles, fibers, and structural sheets. Adding organic/inorganic fibers into the natural rubber composites can increase the mechanical-thermal-physical properties and sound absorption. The natural rubber embedded fiber composite samples were prepared via the vulcanization process at the curing temperature 150°C by the two-roll mill. The amount of whisker alumina (Al2O3), coconut coir and water hyacinth fiber were varied from 0 to 50 phr on 100 phr of natural rubber in a sulfur curing system. The obtained rubber composite samples were of good mechanical properties, low thermal conductivity and good acoustic-sound absorption, suitable for various applications such as automobile, insulation and storage tank. The obtained rubber composite with 10 phr whisker alumina added (NR-Al-10) possessed the tensile strength, Young’s modulus, elongation at break and thermal conductivity values equal to 14.38 ± 1.95 MPa, 545.63 ± 25.67 MPa, 1038.4 ± 41.45% and 0.02527 ± 0.0003 W/m.K, respectively. Furthermore, the sound absorption value of natural rubber composite added 10 phr whisker alumina (NR-Al-10) is equal to 45.09% in the range of 3000‒4000 Hz of acoustic sound level better than the pure natural compound without adding filler.

Advanced flexible rGO-BN natural rubber films with high thermal conductivity for improved thermal management capability

Carbon ◽  
2020 ◽  
Vol 162 ◽  
pp. 46-55 ◽  
Author(s):  
Jingchao Li ◽  
Xiuying Zhao ◽  
Wenjie Wu ◽  
Zhaoxu Zhang ◽  
Yue Xian ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Natural Rubber ◽  
Thermal Management ◽  
High Thermal Conductivity ◽  
Management Capability

THERMAL CONDUCTIVITY OF CARBON NANOTUBE/NATURAL RUBBER COMPOSITE FROM MOLECULAR DYNAMICS SIMULATIONS

2013 ◽  
Vol 12 (03) ◽  
pp. 1350011 ◽  
Author(s):  
YAN HE ◽  
YUANZHENG TANG
Keyword(s):  
Thermal Conductivity ◽  
Molecular Dynamics ◽  
Carbon Nanotube ◽  
Natural Rubber ◽  
Axial Direction ◽  
Md Simulations ◽  
Anisotropic Thermal Conductivity ◽  
Rubber Composite ◽  
Transverse Thermal Conductivity ◽  
Dynamics Simulations

Classical molecular dynamics (MD) simulations are employed to study the thermal conductivity of carbon nanotube/natural rubber (CNT/NR) composite. An aligned CNT/NR system is constructed by atomic potential function and periodic boundary condition and the anisotropic thermal conductivity is predicted in three main directions. The highest thermal conductivity of 80 W/(mK) is predicted along the axial direction of CNT. However, the transverse thermal conductivity perpendicular to the CNT axis is only about 0.6 W/(mK). For obtaining thermal conductivity of randomly oriented CNT/NR composite, an isotropic algorithm is provided from thermal resistance analysis method and results indicate the thermal conductivity improvement of randomly oriented CNT/NR composite is negligible. It is deduced therefore aligning CNTs in NR matrix can be a promising method in thermal management of CNT/NR composite.

A Study of Some Mechanical and Physical Properties for Palm Fiber/Polyester Composite

2020 ◽  
Vol 38 (3B) ◽  
pp. 104-114
Author(s):  
Samah M. Hussein
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Dielectric Constant ◽  
Date Palm ◽  
Volume Fraction ◽  
Unsaturated Polyester ◽  
Dielectric Strength ◽  
Palm Fiber ◽  
Mechanical And Physical Properties ◽  
Polyester Composite

This research has been done by reinforcing the matrix (unsaturated polyester) resin with natural material (date palm fiber (DPF)). The fibers were exposure to alkali treatment before reinforcement. The samples have been prepared by using hand lay-up technique with fiber volume fraction of (10%, 20% and 30%). After preparation of the mechanical and physical properties have been studied such as, compression, flexural, impact strength, thermal conductivity, Dielectric constant and dielectric strength. The polyester composite reinforced with date palm fiber at volume fraction (10% and 20%) has good mechanical properties rather than pure unsaturated polyester material, while the composite reinforced with 30% Vf present poor mechanical properties. Thermal conductivity results indicated insulator composite behavior. The effect of present fiber polar group induces of decreasing in dielectric strength, and increasing dielectric constant. The reinforcement composite 20% Vf showed the best results in mechanical, thermal and electrical properties.

Effect of carbon allotropes on foam formation, cure characteristics, mechanical and thermal properties of NRF/carbon composites

2020 ◽  
pp. 0021955X2097954
Author(s):  
Pollawat Charoeythornkhajhornchai ◽  
Wutthinun Khamloet ◽  
Pattharawun Nungjumnong
Keyword(s):  
Natural Rubber ◽  
Bubble Diameter ◽  
Carbon Composites ◽  
Mechanical And Thermal Properties ◽  
Foam Formation ◽  
Carbon Filler ◽  
Composite Foam ◽  
Carbon Allotropes ◽  
Blowing Agent ◽  
Rubber Composite

Natural rubber composite foam with carbon such as carbon black (CB), carbon synthesized from durian bark (CDB), graphite (GPT), graphene oxide (GO), graphene (GPE) and multi-walled carbon nanotubes (MWCNT) was studied in this work to investigate the relationship between foam formation during decomposition of chemical blowing agent mechanism and crosslink reaction of rubber molecules by sulphur. Natural rubber composite foam with carbon particle was set at 3 parts per hundred of rubber (phr) to observe the effect of carbon allotropes on foam formation with different microstructure and properties of natural rubber composite foam. The balancing of crosslink reaction by sulphur molecules during foam formation by the decomposition of chemical blowing agent affects the different morphology of natural rubber foam/carbon composites leading to the different mechanical and thermal properties. The result showed the fastest cure characteristics of natural rubber foam with 3 phr of graphene (NRF-GPE3) which was completely cure within 6.55 minutes (tc90) measured by moving die rheometer resulting in the smallest bubble diameter among other formulas. Moreover, natural rubber foam with 3 phr of MWCNT (NRF-MWCNT3) had the highest modulus (0.0035 ± 0.0005 N/m2) due to the small bubble size with high bulk density. In addition, natural rubber foam with 3 phr of GPT (NRF-GPT3) had the highest thermal expansion coefficient (282.12 ± 69 ppm/K) due to high amount of gas bubbles inside natural rubber foam matrix and natural rubber foam with 3 phr of GO (NRF-GO3) displayed the lowest thermal conductivity (0.0798 ± 0.0003 W/m.K) which was lower value than natural rubber foam without carbon filler (NRF). This might be caused by the effect of bubble diameter and bulk density as well as the defect on surface of graphene oxide compared to others carbon filler.

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