scholarly journals Formation of organic–inorganic nanomatrix structure with nanosilica networks and its effect on properties of rubber

Polymer ◽  
2016 ◽  
Vol 102 ◽  
pp. 106-111 ◽  
Author(s):  
Kenichiro Kosugi ◽  
Hitoshi Arai ◽  
Yuanbing Zhou ◽  
Seiichi Kawahara
Keyword(s):  
Nanomatrix Structure

DETERMINATION OF A SUITABLE CONDITION OF GRAFT COPOLYMERIZATION OF VINYLTRIETHOXYSILANE ONTO NR TO FORM NANOMATRIX STRUCTURE

2018 ◽  
Vol 91 (4) ◽  
pp. 767-775 ◽  
Author(s):  
Yuanbing Zhou ◽  
Yoshimasa Yamamoto ◽  
Seiichi Kawahara
Keyword(s):  
Silica Nanoparticles ◽  
Graft Copolymerization ◽  
Monomer Concentration ◽  
Minor Component ◽  
Suitable Condition ◽  
Average Diameter ◽  
Silica Matrix ◽  
Rubber Particles ◽  
Hydrolysis And Condensation ◽  
Nanomatrix Structure

ABSTRACT Graft copolymerization of vinyltriethoxysilane (VTES) onto NR particles in the latex stage is a unique reaction, since it occurs together with hydrolysis and condensation of the triethoxysilane group of VTES to form a colloidal silica linking to the rubber particles. These reactions may contribute to the formation of a silica nanomatrix structure that consists of a dispersoid of rubber particles as the major component and a silica matrix as the minor component. Here, the graft copolymerization of VTES followed by hydrolysis and condensation is investigated to determine a suitable condition to prepare NR with a silica nanomatrix structure. The mechanical properties of the resulting graft copolymer are discussed in relation to the morphology, silica content, and gel content of the rubber. Based on morphological observations, NR particles with an average diameter of approximately 1 μm are well dispersed in a nanomatrix consisting of silica nanoparticles. The thickness of the silica nanomatrix increases as the monomer concentration increases, and a long incubation time generates large silica nanoparticles. The tensile strength and viscoelastic properties are significantly improved by forming the silica nanomatrix structure, with its continuous structure that prevents the NR particles from merging.

Entropic and Energetic Elasticities of Natural Rubber with a Nanomatrix Structure

Langmuir ◽  
2020 ◽  
Vol 36 (38) ◽  
pp. 11341-11348
Author(s):  
Yoshimasa Yamamoto ◽  
Kota Endo ◽  
Quentin Tévenot ◽  
Kenichiro Kosugi ◽  
Ken Nakajima ◽  
...  
Keyword(s):  
Natural Rubber ◽  
Nanomatrix Structure

Preparation and properties of natural rubber with filler nanomatrix structure

2015 ◽  
Vol 293 (8) ◽  
pp. 2249-2256 ◽  
Author(s):  
Nurul Hayati Yusof ◽  
Kenshi Noguchi ◽  
Lina Fukuhara ◽  
Yoshimasa Yamamoto ◽  
Seiichi Kawahara
Keyword(s):  
Natural Rubber ◽  
Nanomatrix Structure

EFFECT OF DECELERATED FERMENTATION ON MORPHOLOGY AND MECHANICAL PROPERTIES OF NATURAL RUBBER LATEX

2013 ◽  
Vol 86 (4) ◽  
pp. 615-625 ◽  
Author(s):  
Oraphin Chaikumpollert ◽  
Osamu Wakisaka ◽  
Akio Mase ◽  
Yoshimasa Yamamoto ◽  
Krisda Suchiva ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Natural Rubber ◽  
Scanning Probe Microscopy ◽  
Natural Rubber Latex ◽  
Rubber Latex ◽  
Gel Content ◽  
High Ammonia ◽  
The Relationship ◽  
Nanomatrix Structure ◽  
Morphology And Mechanical Properties

ABSTRACT Decelerated fermentation of natural rubber latex was performed to investigate the relationship between the morphology and mechanical properties of natural rubber. Natural rubber latex was preserved with sodium hydroxymethylglycinate, as a bactericide, to decelerate the fermentation of nonrubber components such as proteins, phospholipids, carbohydrate, and so forth. Gradual increases in the viscosity of the latex and gel content of the resulting rubber took place as the preservation period was prolonged, which were distinguished from less change in the viscosity of high-ammonia natural rubber (HANR) and high gel content of its rubber. The particle size distribution was dramatically changed during decelerated fermentation, although that of the HANR latex did not change. The pH and nitrogen content of the rubbers were independent of the preservation time. Morphology of the fermented natural rubber and the HANR was observed with scanning probe microscopy. Fewer mechanical properties of the fermented natural rubber were related to the destruction of the nanomatrix structure of the nonrubber components, which resulted from the decrease in the fatty acid ester groups with bacteria as compared with the good mechanical properties of the HANR.

Frozen non-equilibrium structure for anisotropically deformed natural rubber with nanomatrix structure observed by 3D FIB-SEM and electron tomography

2015 ◽  
Vol 293 (9) ◽  
pp. 2555-2563 ◽  
Author(s):  
Lina Fukuhara ◽  
Kenichiro Kosugi ◽  
Yoshimasa Yamamoto ◽  
Hiroshi Jinnai ◽  
Hideo Nishioka ◽  
...  
Keyword(s):  
Natural Rubber ◽  
Electron Tomography ◽  
Equilibrium Structure ◽  
Nanomatrix Structure ◽  
Non Equilibrium

ORIGIN OF ENERGETIC ELASTICITY AND ENTROPIC ELASTICITY OF NATURAL RUBBER WITH NANODIAMOND NANOMATRIX STRUCTURE

2021 ◽  
Author(s):  
Asangi Gannoruwa ◽  
Yuanbing Zhou ◽  
Kenichiro Kosugi ◽  
Yoshimasa Yamamoto ◽  
Seiichi Kawahara
Keyword(s):  
Mechanical Properties ◽  
Natural Rubber ◽  
Complex Modulus ◽  
Three Dimensional ◽  
Dynamic Mechanical Properties ◽  
Scanning Calorimetry ◽  
Electron Microscopies ◽  
Entropic Elasticity ◽  
Bound Rubber ◽  
Nanomatrix Structure

ABSTRACT The origin of energetic elasticity in conjunction with the entropic elasticity for natural rubber with a nanodiamond nanomatrix structure was investigated in terms of bound rubber formed between nanodiamonds, based on the interaction between natural rubber and nanodiamonds inside the nanomatrix. The natural rubber with a nanodiamond nanomatrix structure was prepared by reacting nanodiamonds with deproteinized natural rubber in the presence of tert-butylhydroperoxide/tetraethylenepentamine at 30 °C in the latex stage followed by drying. Morphology of the products was observed by two-dimensional and three-dimensional transmission electron microscopies. The effect of bound rubber on the mechanical properties of the products was investigated by measurements of the dynamic mechanical properties and differential scanning calorimetry. The contribution of bound rubber was estimated by combining the Takayanagi equation and modified Guth–Gold equation. A significant increase in complex modulus was attributed to the effect of the bound rubber.

scholarly journals FIB processing for natural rubber with nanomatrix structure

Polymer ◽  
2015 ◽  
Vol 57 ◽  
pp. 143-149 ◽  
Author(s):  
Lina Fukuhara ◽  
Kenichiro Kosugi ◽  
Yoshimasa Yamamoto ◽  
Hiroshi Jinnai ◽  
Hideo Nishioka ◽  
...  
Keyword(s):  
Natural Rubber ◽  
Nanomatrix Structure

FIB-SEM and TEMT Observation of Highly Elastic Rubbery Material with Nanomatrix Structure

2008 ◽  
Vol 41 (12) ◽  
pp. 4510-4513 ◽  
Author(s):  
Seiichi Kawahara ◽  
Yoshimasa Yamamoto ◽  
Shuji Fujii ◽  
Yoshinobu Isono ◽  
Ken-ichi Niihara ◽  
...  
Keyword(s):  
Rubbery Material ◽  
Nanomatrix Structure

Preparation and characterization of natural rubber with soft nanomatrix structure

2012 ◽  
Vol 290 (14) ◽  
pp. 1457-1462 ◽  
Author(s):  
Kenichiro Kosugi ◽  
Ratchaniwan Sutthangkul ◽  
Oraphin Chaikumpollert ◽  
Yoshimasa Yamamoto ◽  
Jitladda Sakdapipanich ◽  
...  
Keyword(s):  
Natural Rubber ◽  
Nanomatrix Structure
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