Aqueous Dispersion of Rice Husk Powder as a Compatible Filler for Natural Rubber Latex Foam

2012 ◽  
Vol 626 ◽  
pp. 530-536 ◽  
Author(s):  
Shamala Ramasamy ◽  
Hanafi Ismail ◽  
Yamuna Munusamy
Keyword(s):  
Particle Size ◽  
Natural Rubber ◽  
Rice Husk ◽  
Agricultural Waste ◽  
Natural Rubber Latex ◽  
Aqueous Dispersion ◽  
Silica Content ◽  
Rubber Latex ◽  
Particle Size Analyzer ◽  
Acidic Nature

Rice husk powder (RHP) which is a fibrous agricultural waste is widely used as potential filler, novel adsorbent or coating for dry polymers. However, the compatibility of RHP with natural rubber latex (NRL) is yet to be studied. The main goal of this reported work was to create a method to incorporate RHP with NRL and achieve a compatible dispersion. However the amorphous silica content (acidic nature) in RHP makes it difficult to directly incorporate RHP to NRL compound. In this research, RHP was modified by adding ammonia, distilled water and dispersing agents to make an aqueous compatible alkaline dispersion for NRL. Also the particle size of RHP is reduced up to - 300micron to make it more compatible with the NRL. The compatibility of modified RHP is analyzed by sedimentation with time, particle size analyzer, pH and morphology study. The test results supports that modified RHP is more compatible with the NRL compound to obtain a stable foam in NRLF preparation.

scholarly journals MWCNT/rGO/natural rubber latex dispersions for innovative, piezo-resistive and cement-based composite sensors

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
L. Verdolotti ◽  
C. Santillo ◽  
G. Rollo ◽  
G. Romanelli ◽  
M. Lavorgna ◽  
...  
Keyword(s):  
Natural Rubber ◽  
Inelastic Neutron Scattering ◽  
Three Dimensional ◽  
Natural Rubber Latex ◽  
Multiwall Carbon Nanotubes ◽  
Aqueous Dispersion ◽  
Inelastic Neutron ◽  
X Ray Diffraction ◽  
Rubber Latex ◽  
Latex Dispersions

AbstractThe present study is focused on the development and characterization of innovative cementitious-based composite sensors. In particular, multifunctional cement mortars with enhanced piezoresistive properties are realized by exploiting the concept of confinement of Multiwall Carbon Nanotubes (MWCNTs) and reduced Graphene Oxide (rGO) in a three-dimensional percolated network through the use of a natural-rubber latex aqueous dispersion. The manufactured cement-based composites were characterized by means of Inelastic Neutron Scattering to assess the hydration reactions and the interactions between natural rubber and the hydrated-cement phases and by Scanning Electron Microscopy and X-Ray diffraction to evaluate the morphological and mineralogical structure, respectively. Piezo-resistive properties to assess electro-mechanical behavior in strain condition are also measured. The results show that the presence of natural rubber latex allows to obtain a three-dimensional rGO/MWCNTs segregate structure which catalyzes the formation of hydrated phases of the cement and increases the piezo-resistive sensitivity of mortar composites, representing a reliable approach in developing innovative mortar-based piezoresistive strain sensors.

Preparation and Characterization of Rice Husk Powder Incorporated Natural Rubber Latex Foam

2012 ◽  
Vol 626 ◽  
pp. 523-529 ◽  
Author(s):  
Shamala Ramasamy ◽  
Hanafi Ismail ◽  
Yamuna Munusamy
Keyword(s):  
Tensile Strength ◽  
Natural Rubber ◽  
Rice Husk ◽  
Structural Characterization ◽  
Natural Rubber Latex ◽  
Filler Loading ◽  
Rubber Latex ◽  
Elongation At Break ◽  
Rice Milling

Rice husk powder (RHP) is an abundant agricultural by product that is produced in bulk quantity as part of rice milling. This research is carried out to incorporate RHP with natural rubber latex (NRL) compound. Different loading of RHP is added to NRL compound and is foamed to make natural rubber latex foam (NRLF) using a well known technique called the Dunlop method. The tensile properties of modified NRLF is studied and compared with the controlled NRLF which has zero RHP loading. The morphology and micro structural characterization has been performed by Tabletop microscopy (TM1000). The tensile strength decreases at 2.5 pphr but increases again as the filler loading increases. Elongation at break decreases whereas modulus at 100% elongation (M 100) and hardness increases as the filler loading increases.

scholarly journals MWCNT/rGO/natural rubber latex dispersions for innovative, piezo-resistive and cement-based composite sensors

2021 ◽  
Author(s):  
Letizia Verdolotti ◽  
Chiara Santillo ◽  
Gennaro Rollo ◽  
Giovanni Romanelli ◽  
Marino Lavorgna ◽  
...  
Keyword(s):  
Natural Rubber ◽  
Inelastic Neutron Scattering ◽  
Three Dimensional ◽  
Natural Rubber Latex ◽  
Aqueous Dispersion ◽  
Conductive Filler ◽  
Inelastic Neutron ◽  
Multiwall Carbon Nanotube ◽  
Rubber Latex ◽  
Electron Scanning Microscopy

Abstract The present study is focused on the development and characterization of innovative cementitious-based composite sensors. In particular, multifunctional cement mortar composites with enhanced functional, piezo-resistive, properties are designed with Multiwall Carbon Nanotube-MWCNTs and reduced Graphene Oxide-rGO dispersed in a natural-rubber latex aqueous dispersion, by exploiting both the concept of confining of the conductive filler in the polymeric phase. The manufactured cement-based composites were characterized by means of Inelastic Neutron Scattering to assess the hydration reactions and the interactions of natural rubber with the hydrated cement phases and by Electron Scanning Microscopy and X-Ray diffraction to evaluate the morphological and mineralogical structure, respectively. Piezo-resistive properties to assess electro-mechanical behavior in strain condition are also measured. The results show that the presence of natural-rubber latex permits to obtain a three-dimensional rGO/MWCNTs segregate structure which catalyzes the formation of hydrated phases of the cement and increases the piezo-resistive sensitivity of mortar composites, representing a reliable approach in developing innovative mortar-based piezoresistive strain sensors.

Physical and Mechanical Properties of Cement/Natural Rubber Latex/Rice Husk Ash Composites

2015 ◽  
Vol 804 ◽  
pp. 124-128
Author(s):  
Nittaya Jaitanong ◽  
Tanapong Chaipunti
Keyword(s):  
Mechanical Properties ◽  
Portland Cement ◽  
Natural Rubber ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Natural Rubber Latex ◽  
Physical And Mechanical Properties ◽  
Ammonia Solution ◽  
Rubber Latex ◽  
Cement Ratio

The microstructure and mechanical properties of Portland cement (PC)- natural rubber latex (NRL)- rice husk ash (RHA) composites have been investigated. The proportions of PC-NRL-RHA composites with NRL to cement ratio (NRL/C) that use in this experiment were 0, 0.10, 0.15 and 0.20 respectively. Portland cement (PC) was partially replaced with rice husk ash at 20% by weight of binder. The rice husk ash (RHA) was ground for 180 minutes before using. Water to cement ratio (W/C) equal of 0.5 by weight not include water in NRL. Nonionic surfactant was added in cement before mixed with NRL. In addition, to provide latex from natural rubber, the ammonia solution is added into natural rubber. The specimens were casting in standard mold which samples size of 50x50x50 and 40x40x160 mm3 respectively. Moreover, the PC-NRL-RHA composites were cured in water for 3, 7 and 28 days at room temperature before measurement. Then, mechanical properties (compressive strength and flexural strength) and microstructure were studied.

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