scholarly journals Novel Solvent–Latex Mixing: Thermal Insulation Performance of Silica Aerogel/Natural Rubber Composite

Gels ◽  
2021 ◽  
Vol 8 (1) ◽  
pp. 7
Author(s):  
Chayanan Boonrawd ◽  
Supan Yodyingyong ◽  
Lazhar Benyahia ◽  
Darapond Triampo
Keyword(s):  
Natural Rubber ◽  
Thermal Insulation ◽  
Silica Aerogel ◽  
Natural Rubber Latex ◽  
The Novel ◽  
Porous Structures ◽  
Promising Technique ◽  
Rubber Composite ◽  
Insulation Performance ◽  
Macropore Formation

In this work, the novel natural rubber latex (NRL) mixing was approached. The mixing process was carried out by using n-hexane as the dispersed phase of silica aerogel which acted as thermal insulation filler prior to NRL mixing. The silica aerogel/NR composites were prepared with different silica aerogel contents of 20, 40, 60, 80, and 100 parts per hundred rubber (phr). The morphology of the 40 phr composite showed the NR macropore formation with silica aerogel intercalated layers. The optimal content of silica aerogels and n-hexane were the key to obtaining the NR macropore. The thermal insulation performance of silica aerogel/NR composites was investigated because of their porous structures. The thermal conductivity of the composites were lower than that of the neat NR sheet and decreased from 0.081 to 0.055 W m−1·K−1 with increasing silica aerogel content. The lower densities of the composites than that of the NR sheet were revealed noticeably. In addition, the silica aerogel/NR composites exhibited a higher heat retardant ability than that of the NR sheet, and the comparable glass transition temperatures (Tg) of the composites and the neat NR indicated the maintained flexibility at ambient temperature or higher, which can benefit various temperature applications. The overall results demonstrated that the silica aerogel/NR composites from the novel NRL mixing preparation could be a promising technique to develop the porous materials and be utilised as thermal insulation products and building constructions.

Thermal Insulation Performances of Plaster Composites Based on Embedding Natural Rubber Latex Compound

2021 ◽  
Vol 904 ◽  
pp. 441-446
Author(s):  
Nuchnapa Tangboriboon ◽  
Sarun Muntongkaw ◽  
Sompratthana Pianklang
Keyword(s):  
Natural Rubber ◽  
Thermal Insulation ◽  
Water Solubility ◽  
Testing Machine ◽  
Natural Rubber Latex ◽  
Cold Weather ◽  
Mechanical And Thermal Properties ◽  
Rubber Latex ◽  
Universal Testing ◽  
Cost Of Energy

Adding 0, 20, and 50 wt% natural-rubber latex compound into the plaster ceiling matrix affected to increase the physical-mechanical-thermal performance properties of plaster ceiling composites. Adding 50 wt% natural rubber latex compound into plaster composites can increase the superior adhesion of the nail-tensile resistance equal to 57.54 N and decrease thermal conductivity equal to 0.0634 W/m.K. In addition, adding natural rubber latex compounds into plaster composites can reduce water solubility, brittleness, impact, and cost of energy consumption due to the exterior temperature. Adequate thermal insulation for roofing, ceiling, and wall systems also reduces radiative losses that chill occupants in cold weather, and reduce interior surface temperatures in the summer, thereby optimizing the comfort of building occupants. The mechanical and thermal properties of plaster composites were investigated by using a Universal Testing Machine (UTM) and heat flow meter, respectively, measured according to TIS 1211-50, TIS 219-2522, and ASTM C518.

Thermal stability and mechanical properties of modified starch/NR composite

e-Polymers ◽  
2010 ◽  
Vol 10 (1) ◽  
Author(s):  
Zhi-Fen Wang ◽  
Si-Dong Li ◽  
Xin Fu ◽  
Hua Lin ◽  
Xiao-Dong She ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Natural Rubber ◽  
Permanent Deformation ◽  
Natural Rubber Latex ◽  
Modified Starch ◽  
Rubber Latex ◽  
Rubber Composite ◽  
Reaction Activation Energy ◽  
Thermal Stability Of

AbstractThe starch/natural rubber composite was prepared by blending the modified starch by esterification with natural rubber latex. The modified starch particles are homogenously distributed throughout the natural rubber (NR) matrix. In comparison with the host NR, the thermal stability of composite is significantly improved. The thermal degradation temperatures (T) and reaction activation energy (E) of composite are higher than those of the pure NR. The hardness, stress at 500%, tensile strength, permanent deformation and tear strength of composite increase linearly with the increment of dosage of modified starch.

scholarly journals Evaluation of thermal insulation and mechanical properties of waste rubber/natural rubber composite

HBRC Journal ◽  
2012 ◽  
Vol 8 (1) ◽  
pp. 69-74 ◽  
Author(s):  
M.M. Abdel Kader ◽  
S.M. Abdel-wehab ◽  
M.A. Helal ◽  
H.H. Hassan
Keyword(s):  
Mechanical Properties ◽  
Natural Rubber ◽  
Thermal Insulation ◽  
Waste Rubber ◽  
Rubber Composite

Properties of Thermal Insulation from Durian Peel Fiber and Natural Rubber Latex

2012 ◽  
Vol 506 ◽  
pp. 571-574 ◽  
Author(s):  
Thanut Jintakosol ◽  
Supreyak Kumfu
Keyword(s):  
Thermal Conductivity ◽  
Natural Rubber ◽  
Thermal Insulation ◽  
Natural Rubber Latex ◽  
Rubber Latex ◽  
American Society

This research presented the studies on the production and properties of thermal insulation produced from durian peel fiber and natural rubber latex. The thermal insulation were made by spray the pre-treated natural rubber latex onto durian peel fiber in the fiber : binder ratios of 1:2, 1:3 and 1:4 to form squared thermal insulation with the size of 20 cm and 1.5 cm thickness. Thermal conductivity measured in accordance with American Society for Testing Materials standard was found to be 0.026 W /m K with density of 143 kg m-3 which closed to the commercial insulator. The success of this study shown that the thermal insulation made from durian peel fiber and natural rubber latex exhibited a good thermal insulation and extremely potential to instead of the synthesis fibrous insulator.

scholarly journals Design and Validation of Thermal Insulation for Deep-sea Fluid Sampler of Jiaolong Human Occupied Vehicle

2021 ◽  
Vol 2095 (1) ◽  
pp. 012070
Author(s):  
Kaiben Yu ◽  
Le Zong ◽  
Shengqi Yu ◽  
Qingjian Meng ◽  
Baohua Liu
Keyword(s):  
Experimental Study ◽  
Thermal Insulation ◽  
Deep Sea ◽  
Silica Aerogel ◽  
Simulation Analysis ◽  
Maximum Temperature ◽  
Vehicle Simulation ◽  
Variation Characteristics ◽  
Insulation Effect ◽  
Insulation Performance

Abstract In this paper, a thermal insulation structure with silica aerogel felt as filler material was designed for the requirements of deep-sea fluid thermal insulation sampling technology for Jiaolong human occupied vehicle. Simulation analysis of thermal insulation performance was carried out and an experimental prototype was developed for the thermal insulation structure. Experimental study on thermal insulation performance was conducted with the variation characteristics of the operation environment for Jiaolong human occupied vehicle being taken into account. Results show that the silica aerogel felt with a thickness of 30 mm filled in the radial space between the inner and outer cylinders can achieve the expected thermal insulation effect during the diving-sampling-transferring process, with maximum temperature rise of 8.5 °C, and can meet the requirements of deep-sea fluid thermal insulation sampling technology.

Study on the Thermal Insulation Performance of PAN Pre-Oxidised Fibre Felts

2020 ◽  
Vol 28 (3(141)) ◽  
pp. 27-37
Author(s):  
Xiaoming Zhao ◽  
Yuanjun Liu ◽  
Tenglong Liang
Keyword(s):  
Thermal Conductivity ◽  
Thermal Stability ◽  
Tensile Strength ◽  
Tensile Properties ◽  
Thermal Insulation ◽  
Silica Aerogel ◽  
Orthogonal Experiment ◽  
Excellent Thermal Stability ◽  
Coefficient Of Thermal Conductivity ◽  
Insulation Performance

In this paper, an orthogonal experiment of 3 factors and 3 levels was firstly designed to prepare PAN pre-oxidised fibre felts with good thermal insulation properties; the range method was used to analyse the result of the orthogonal experiment, and finally the tensile properties and thermal stability were tested. Finally, pre-oxidised fibre felt composites for the coating of silica aerogel were prepared using the coating process to compound silica aerogel on re-oxidised fibre felts. Firstly, the influence of the content of silica aerogel on the heat insulation performance of the coated composite materials was analysed, and then a test of the coefficient of thermal conductivity, an experiment on the back temperature, and characterisations of the tensile properties and thermal stability of the composite coating of pre-oxidised fibre felt composites of the coating of silica aerogel were carried out. Results showed that through analysis of the orthogonal experiment, we can state that the best preparation process of pre-oxidised fibre needled felts was as follows: needle number – 2, needle depth – 8 mm, and needle frequency – 140 times/min. The transverse tensile strength of PAN pre-oxidised fibre needled felts prepared by crossly webbing of PAN pre-oxidised fibres was superior to the longitudinal tensile strength; thermogravimetric analysis showed that the pre-oxidised fibre needled felts had excellent thermal stability. The coefficient of thermal conductivity of the aerogel coating of the composites firstly decreased and then increased with an increase in the content of aerogel. Coated composites had the lowest coefficient of thermal conductivity when the aerogel content was 4% wt. At temperatures of 100 °C, 150 °C and 200 °C, the heating rate of the transient-state back temperature and the steady-state average temperature were both the lowest when the aerogel content was 6% wt.

scholarly journals Cost-Effective Additive Manufacturing of Ambient Pressure-dried Silica Aerogel

2020 ◽  
pp. 1-32
Author(s):  
Zipeng Guo ◽  
Ruizhe Yang ◽  
Tianjiao Wang ◽  
Lu An ◽  
Shenqiang Ren ◽  
...  
Keyword(s):  
Thermal Insulation ◽  
Silica Aerogel ◽  
Processing Time ◽  
Ambient Pressure ◽  
Cost Effective ◽  
Supercritical Drying ◽  
Insulation Material ◽  
Market Demand ◽  
Insulation Property ◽  
Insulation Performance

Abstract The conventional manufacturing processes of aerogel insulation material is largely relying on the supercritical drying, which suffers from issues of massive energy consumption, high-cost equipment, and prolonged processing time. With the consideration of large market demand of the aerogel insulation material in the next decade, a low-cost and scalable fabrication technique is highly desired. In this paper, a direct ink writing (DIW) method is used to three-dimensionally fabricate the silica aerogel insulation material, followed by room-temperature and ambient pressure drying. Compared to the supercritical drying and freeze-drying, the reported method significantly reduces the fabrication time and costs. The cost-effective DIW technique offers the capability to print complex hollow internal structures, coupled with the porous structure, is found to be beneficial to the thermal insulation property. The addition of fiber to the ink assures the durability of the fabricated product, without sacrificing the thermal insulation performance. The foam ink preparation methods and the printability are demonstrated in this paper, along with the printing of complex three-dimensional geometries. The thermal insulation performance of the printed objects is characterized, and the mechanical properties are also examined. The proposed approach is found to have 56% reduction in the processing time. The printed silica aerogels exhibit a low thermal conductivity of 0.053 W m−1 K−1.

scholarly journals A New Approach of Fabricating Graphene Nanoplates@Natural Rubber Latex Composite and Its Characteristics and Mechanical Properties

2018 ◽  
Vol 4 (3) ◽  
pp. 50 ◽  
Author(s):  
Duong La ◽  
Tuan Nguyen ◽  
Viet Quoc ◽  
Tham Nguyen ◽  
Duy Nguyen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Natural Rubber ◽  
High Surface ◽  
High Surface Area ◽  
Natural Rubber Latex ◽  
Chemical Exfoliation ◽  
Rubber Composite ◽  
One Step ◽  
Mixing Method ◽  
Graphene Nanoplates

Graphene has been demonstrated to be one of the most promising candidates to use as filler to improve the electrical, thermal, chemical and mechanical properties of natural rubber due to exceptional high surface area, superior electrical and thermal conductivity, and remarkable gas impermeability resistance. In this study, graphene nanoplates (GNPs) were mass-produced by a one-step chemical exfoliation of natural graphite and used as a filler for the fabrication of GNPs@natural rubber composite by a simple mixing method. The resultant GNPs/rubber composite was characterized by using scanning electron microscopy (SEM), and a rheometer. The prepared graphene nanoplates had a thickness of less than 10 nm and a lateral size of tens of microns. The GNPs@rubber composite revealed an exceptional improvement of abrasion loss up to seven to ten fold, along with an approximately 400%, 200% and 30% increment of elongation at break, tear strength and tensile strength, respectively. Other mechanical properties, such as hardness, compression set and rebound, as well as the effect of the GNPs loadings on the mechanical properties of the composite, were also investigated in detail.

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