Investigation of the co-coagulation of natural rubber latex and cellulose nanocrystals aqueous dispersion

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.

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Effect of cellulose nanocrystals from corn cob with dispersion agent polyvinyl pyrrolidone in natural rubber latex film after aging treatment

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/309/1/012101 ◽

2018 ◽

Vol 309 ◽

pp. 012101

Author(s):

H Harahap ◽

M Ridha ◽

Halimatuddahliana ◽

Taslim ◽

Iriany

Keyword(s):

Natural Rubber ◽

Cellulose Nanocrystals ◽

Natural Rubber Latex ◽

Aging Treatment ◽

Polyvinyl Pyrrolidone ◽

Latex Film ◽

Corn Cob ◽

Rubber Latex ◽

Dispersion Agent

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.626.530 ◽

2012 ◽

Vol 626 ◽

pp. 530-536 ◽

Cited By ~ 4

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.

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

10.21203/rs.3.rs-234097/v1 ◽

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.

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