Multifunctional conductive graphite/cellulosic microfiber-natural rubber composite sponge with ultrasensitive collision-warning and fire-waring

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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Effect of fiber coating on the mechanical performance, water absorption and biodegradability of sisal fiber/natural rubber composite

Polymer International ◽

10.1002/pi.6207 ◽

2021 ◽

Author(s):

Ahmed Abdel‐Hakim ◽

Abd El‐Aziz Arafa El‐Wakil ◽

Soma El‐Mogy ◽

Sawsan Halim

Keyword(s):

Natural Rubber ◽

Water Absorption ◽

Mechanical Performance ◽

Sisal Fiber ◽

Fiber Coating ◽

Rubber Composite

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

Journal of Vinyl and Additive Technology ◽

10.1002/vnl.20302 ◽

2012 ◽

Vol 18 (3) ◽

pp. 184-191 ◽

Cited By ~ 9

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

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Electromechanical-Conductive Natural Rubber Doped Eggshell and Eggshell Membrane for Drug Delivery and Actuator Applications

Materials Science Forum ◽

10.4028/www.scientific.net/msf.934.43 ◽

2018 ◽

Vol 934 ◽

pp. 43-49

Author(s):

Poramin Boonprasert ◽

Nuchnapa Tangboriboon

Keyword(s):

Composite Materials ◽

Natural Rubber ◽

Artificial Muscle ◽

Eggshell Membrane ◽

Curing Time ◽

Electrical Field ◽

Fibrous Protein ◽

Rubber Composite ◽

Field Response ◽

Biomimetic Actuator

Natural rubber composite materials were prepared by using sulfur curing system of STR 5L added with hen eggshell and eggshell membrane to increase electrical and mechanical properties for biomimetic actuator and artificial muscle applications. Samples were vulcanized at temperature 150°C. Hen eggshells and eggshell membrane powder (0, 20, 40, and 60 phr) were added into natural rubber. The main composition of hen eggshells composed of 96.35 wt% calcium carbonate (CaCO3) while mostly composition of hen eggshell membrane is fibrous protein in terms of collagen. The best condition is addition of eggshell 40 phr (formula 3) and eggshell membrane 20 phr (formula 5) to obtain the highest storage modulus response equal to 2.85 x 106 and 2.97 x106 Pa, respectively. The curing time (Tc90) of pure natural rubber (formula 1), formula 3, and formula 5 are 8.22, 6.73, and 5.67 min, respectively. Furthermore, the curing time, rheology, and electrical field response of natural rubber composite materials were measured by moving die rheometer and impedance analyzer, and reported here.

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