Epoxidised natural rubber/silica hybrid nanocomposites by sol-gel technique: Effect of reactants on the structure and the properties

2005 ◽  
Vol 40 (1) ◽  
pp. 53-62 ◽  
Author(s):  
A. Bandyopadhyay ◽  
M. De Sarkar ◽  
A. K. Bhowmick
Keyword(s):  
Natural Rubber ◽  
Sol Gel ◽  
Hybrid Nanocomposites ◽  
Technique Effect ◽  
Gel Technique ◽  
Silica Hybrid

Polyamide-6,6/in situ silica hybrid nanocomposites by sol–gel technique: synthesis, characterization and properties

Polymer ◽  
2005 ◽  
Vol 46 (10) ◽  
pp. 3343-3354 ◽  
Author(s):  
Rajatendu Sengupta ◽  
Abhijit Bandyopadhyay ◽  
Sunil Sabharwal ◽  
Tapan K. Chaki ◽  
Anil K. Bhowmick
Keyword(s):  
Sol Gel ◽  
Hybrid Nanocomposites ◽  
In Situ Silica ◽  
Gel Technique ◽  
Silica Hybrid

Epoxidized Natural Rubber / Silica Nanoscale Organic-Inorganic Hybrid Composites Prepared by Sol-Gel Technique

2004 ◽  
Vol 77 (5) ◽  
pp. 830-846 ◽  
Author(s):  
Abhijit Bandyopadhyay ◽  
Mousumi De Sarkar ◽  
Anil K. Bhowmick
Keyword(s):  
Tensile Strength ◽  
Natural Rubber ◽  
Hybrid Composites ◽  
Sol Gel ◽  
Hybrid Nanocomposites ◽  
Dicumyl Peroxide ◽  
Inorganic Hybrid ◽  
Gel Technique ◽  
Rubber Phase

Abstract Epoxidized natural rubber (ENR) / silica organic-inorganic hybrid nanocomposites were prepared by using a sol-gel technique. Tetraethoxysilane was used as the precursor for the in-situ generation of silica. The choice of ENR as a matrix was made because of its polar nature which can interact with the in-situ generated silica. The sol-gel reaction was carried out at room temperature by dissolving the rubber in tetrahydrofuran solvent using hydrochloric acid as the catalyst. The resultant composite films appeared transparent up to 50 wt% of tetraethoxysilane loading. Dispersion of the discrete silica particles having dimensions of 15 – 100 nm was observed through transmission electron microscope. Scanning electron microscopic studies did not produce any evidence for formation of silica network within the bulk of the composite. Infrared spectroscopic studies indicated the occurrence of chemical interaction within the rubber /silica organic-inorganic interfaces which was further supported by the insolubility of the respective samples in tetrahydrofuran under the ambient conditions. Mechanical reinforcement within the hybrid nanocomposites, both at high and low temperature regions, was demonstrated through dynamic mechanical analysis. The composites exhibited superior tensile strength and tensile moduli compared to the gum rubber samples. Further reinforcement was noticed when the rubber phase in the nanocomposites was cured with either benzoyl peroxide or dicumyl peroxide. The dicumyl peroxide cured hybrid composites displayed 112% improvement in tensile strength over the control crosslinked rubber sample, probably due to synergisms of nanosilica reinforcement and crosslinking of the rubber phase in the hybrids.

scholarly journals Characteristic of Hybrid Cellulose-Amino Functionalized POSS-Silica Nanocomposite and Antimicrobial Activity

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Sivalingam Ramesh ◽  
Jaehwan Kim ◽  
Joo-Hyung Kim
Keyword(s):  
Coupling Agent ◽  
High Performance ◽  
Pathogenic Bacteria ◽  
Sol Gel ◽  
Hybrid Nanocomposites ◽  
Morphological Properties ◽  
Regenerated Cellulose ◽  
Polyhedral Oligomeric Silsesquioxanes ◽  
Covalent Crosslinking ◽  
Silica Hybrid

Recently, cellulose has much attention as an emerging renewable nanomaterial which holds promising properties having unique piezoelectricity, insulating, and biodegradable nature for various applications. Also, the modified properties of cellulose by appropriate chemical modifications in various functional groups with outstanding properties or significantly improved physical, chemical, biological, and electronic properties will widen the way for it to be utilized in different usages. Therefore, in this paper, cellulose-functionalized polyhedral oligomeric silsesquioxanes (POSS) based materials were considered an important class of high-performance hybrid nanocomposite materials. To functionalize the regenerated cellulose, amino functionalized POSS material was synthesized via sol-gel covalent crosslinking process in presence of amino coupling agent. In this reaction, tetraethoxsilane (TEOS) andγ-aminopropyltriethoxy silane (γ-APTES) as coupling agent for metal precursors were selected. The chemical structure of cellulose-amine functionalized bonding and covalent crosslinking hybrids was confirmed by FTIR and1H NMR spectral analysis. From the TEM results, well-dispersed hybrid cellulose-functionalized POSS-silica composites are observed. The resulting cellulose-POSS-silica hybrid nanocomposites materials provided significantly improved the optical transparency, and thermal and morphological properties to compare the cellulose-silica hybrid materials. Further, antimicrobial test against pathogenic bacteria was carried out.

Synthesis and characterization of acrylic rubber/silica hybrid composites prepared by sol-gel technique

2004 ◽  
Vol 93 (6) ◽  
pp. 2579-2589 ◽  
Author(s):  
Abhijit Bandyopadhyay ◽  
Anil K. Bhowmick ◽  
Mousumi De Sarkar
Keyword(s):  
Hybrid Composites ◽  
Sol Gel ◽  
Synthesis And Characterization ◽  
Gel Technique ◽  
Silica Hybrid

Synthesis of titanium dioxide by ultrasound assisted sol–gel technique: Effect of calcination and sonication time

2015 ◽  
Vol 23 ◽  
pp. 185-191 ◽  
Author(s):  
D.V. Pinjari ◽  
Krishnamurthy Prasad ◽  
P.R. Gogate ◽  
S.T. Mhaske ◽  
A.B. Pandit
Keyword(s):  
Titanium Dioxide ◽  
Sol Gel ◽  
Sonication Time ◽  
Technique Effect ◽  
Gel Technique ◽  
Ultrasound Assisted

scholarly journals AMINO AND MERCAPTO-SILICA HYBRID FOR Cd(II) ADSORPTION IN AQUEOUS SOLUTION

2010 ◽  
Vol 9 (2) ◽  
pp. 170-176 ◽  
Author(s):  
Buhani Buhani ◽  
Narsito Narsito ◽  
Nuryono Nuryono ◽  
Eko Sri Kunarti
Keyword(s):  
Silica Gel ◽  
Sol Gel ◽  
Selectivity Coefficient ◽  
Energy Dispersion Spectroscopy ◽  
X Ray ◽  
Silica Source ◽  
Batch System ◽  
Adsorption Capacities ◽  
Gel Technique ◽  
Silica Hybrid

Modification of silica gel with 3-aminopropyltrimethoxysilane and 3-mercaptopropyltrimethoxysilane through sol-gel technique producing amino-silica hybrid (HAS) and mercapto-silica hybrid (HMS), respectively, has been carried out using tetraethylorthosilicate (TEOS) as silica source. The adsorbents were characterized using infrared spectroscopy (IR), and X-ray energy dispersion spectroscopy (EDX). Adsorption of Cd(II) individually as well as its binary mixture with Ni(II), Cu(II), and Zn(II) in solution was performed in a batch system. Adsorption capacities of Cd(II) ion on adsorbent of silica gel (SG), HAS, and HMS are 86.7, 256.4 and 319.5 μmol/g with the adsorption energies are 24.60, 22.61 and 23.15 kJ/mol, respectively. Selectivity coefficient (α) of Cd(II) ion toward combination of Cd(II)/Ni(II), Cd(II)/Cu(II), and Cd(II)/Zn(II) ions on HAS adsorbent is relatively smaller than those on HMS adsorbent which has α > 1.   Keywords: adsorption, amino-silica hybrid, mercapto-silica

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