scholarly journals Preparation of Positively Charged Membrane from Natural Rubber Latex Blending with Chitosan

2014 ◽  
Vol 24 (3S1) ◽  
pp. 51-56
Author(s):  
Wirach Taweepreda ◽  
Supawadee Tuaybut ◽  
Sineenart Puangmanee ◽  
Tran Dang Khoa
Keyword(s):  
Natural Rubber ◽  
Film Formation ◽  
Natural Rubber Latex ◽  
Interfacial Polarization ◽  
Rubber Latex ◽  
Weight Percentage ◽  
Force Microscopy ◽  
Atomic Force ◽  
Two Peaks ◽  
Positively Charged

Film formation of natural rubber latex (NRL) blended with various concentrations of chitosan was investigated. Atomic force microscopy (AFM) images clearly showed that the NRL film covered chitosan phase. Roughness of the films which was calculated from AFM image increases with increasing chitosan concentration. Miscibility of NRL and chitosan in solution was investigated by using dynamic mechanical thermal analysis (DMTA) and found that chitosan incorporated with NRL less than 40 weight percentage (wt%) was partially miscible. Films  of the chitosan blending with higher NRL contents exhibited two peaks of glass transition temperatures. Interfacial polarization and dielectric properties of polymer films were improved with increasing NRL contents. Chemical structure of the blends was characterized by using attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR).

scholarly journals Reinforcement of Natural Rubber Latex Using Jute Carboxycellulose Nanofibers Extracted Using Nitro-Oxidation Method

Nanomaterials ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 706 ◽  
Author(s):  
Sunil K. Sharma ◽  
Priyanka R. Sharma ◽  
Simon Lin ◽  
Hui Chen ◽  
Ken Johnson ◽  
...  
Keyword(s):  
Natural Rubber ◽  
Natural Rubber Latex ◽  
High Energy ◽  
Effective Diameter ◽  
Rubber Latex ◽  
Carboxyl Content ◽  
Force Microscopy ◽  
Petroleum Price ◽  
Atomic Force ◽  
Transmission Electron

Synthetic rubber produced from nonrenewable fossil fuel requires high energy costs and is dependent on the presumed unstable petroleum price. Natural rubber latex (NRL) is one of the major alternative sustainable rubber sources since it is derived from the plant ‘Hevea brasiliensis’. Our study focuses on integrating sustainably processed carboxycellulose nanofibers from untreated jute biomass into NRL to enhance the mechanical strength of the material for various applications. The carboxycellulose nanofibers (NOCNF) having carboxyl content of 0.94 mmol/g was prepared and integrated into its nonionic form (–COONa) for its higher dispersion in water to increase the interfacial interaction between NRL and NOCNF. Transmission electron microscopy (TEM) and atomic force microscopy (AFM) analyses of NOCNF showed the average dimensions of nanofibers were length (L) = 524 ± 203 nm, diameter (D) 7 ± 2 nm and thickness 2.9 nm. Furthermore, fourier transform infra-red spectrometry (FTIR) analysis of NOCNF depicted the presence of carboxyl group. However, the dynamic light scattering (DLS) measurement of NRL demonstrated an effective diameter in the range of 643 nm with polydispersity of 0.005. Tensile mechanical strengths were tested to observe the enhancement effects at various concentrations of NOCNF in the NRL. Mechanical properties of NRL/NOCNF films were determined by tensile testing, where the results showed an increasing trend of enhancement. With the increasing NOCNF concentration, the film modulus was found to increase quite substantially, but the elongation-to-break ratio decreased drastically. The presence of NOCNF changed the NRL film from elastic to brittle. However, at the NOCNF overlap concentration (0.2 wt. %), the film modulus seemed to be the highest.

Unravelling the nanometre-scale stimuli-responsive properties of natural rubber latex particles using atomic force microscopy

Soft Matter ◽  
2012 ◽  
Vol 8 (9) ◽  
pp. 2724 ◽  
Author(s):  
Fabien Gaboriaud ◽  
Benoit de Gaudemaris ◽  
Thomas Rousseau ◽  
Sylvie Derclaye ◽  
Yves F. Dufrêne
Keyword(s):  
Atomic Force Microscopy ◽  
Natural Rubber ◽  
Natural Rubber Latex ◽  
Stimuli Responsive ◽  
Rubber Latex ◽  
Latex Particles ◽  
Force Microscopy ◽  
Atomic Force

Preparation, Adhesive Performance and Stability of Natural Rubber Latex Grafted with N-Butyl Acrylate (BA) and Methyl Methacrylate (MMA)

2008 ◽  
Vol 47-50 ◽  
pp. 1149-1152 ◽  
Author(s):  
Pranee Chumsamrong ◽  
Jakkarin Mondobyai
Keyword(s):  
Shear Strength ◽  
Natural Rubber ◽  
Methyl Methacrylate ◽  
Butyl Acrylate ◽  
Natural Rubber Latex ◽  
Peel Strength ◽  
Rubber Latex ◽  
Weight Percentage ◽  
Monomer Ratio ◽  
Lap Shear

In order to study the potential of increasing the weather stability of natural rubber latex for use as a water-based contact adhesive, the natural rubber latex was modified by graft copolymerization with n-butyl acrylate (BA) and methyl methacrylate (MMA). The grafting reaction was carried out using emulsion polymerization at 60°C. Potassium persulfate was used to initiate polymerization. Four different weight percentage ratios of BA to MMA used in this work were 80:20, 70:30, 60:40 and 50:50. Percentage conversion of the monomer of all latexes prepared was ≥ 79.8 %. The grafting efficiency of grafted natural rubber latexes with a different monomer ratio tended to decrease with an increase of MMA. The adhesion property was characterized by 90° peel strength and 180° lap shear tests. The shear strength value of grafted natural rubber latexes increased with an increase of MMA content. The grafted latex with the monomer ratio of 50:50 possessed higher shear strength than natural rubber latex. The peel strength value of grafted natural rubber latexes seemed to lower than that of natural rubber latex. The weather stability of the modified latex was characterized using thermogravimetric analysis (TGA) and also the peel samples were left in the open air for 45 days before testing. The results showed that grafted natural rubber latex had a higher weather stability than natural rubber latex.

Current Study on Structural Characterization and Unique Film Formation of Hevea brasiliensis Natural Rubber Latex

2013 ◽  
Vol 844 ◽  
pp. 498-501 ◽  
Author(s):  
Jitladda Sakdapipanich
Keyword(s):  
Natural Rubber ◽  
Hevea Brasiliensis ◽  
Film Formation ◽  
Rubber Particle ◽  
Particle Surface ◽  
Natural Rubber Latex ◽  
Force Microscopy ◽  
Latex Glove ◽  
Commercial Source

Hevea brasiliensis natural rubber (NR) latex is a very important commercial source of elastomers. It is not only a source for dry NR rubber but also the feedstock for the latex glove dipping industry. The particles of freshly tapped latex are known to be stabilized by proteins and lipids that come with the latex from the tree. These non-rubbers [, especially proteins and lipids, confer to the rubber and latex excellent properties unsurpassed by any synthetic latex [. Recent structural studies of NR revealed that the NR molecules comprise of 2 trans-isoprene units connected to a long-chain cis-isoprene units. Two terminal groups, referred to as ω and α, have been postulated to link with mono-and di-phosphate groups associated with phospholipids by H-bonding at the α-terminal, whereas the ω-terminal is a dimethylallyl group links to protein by H-bonding [. Although numerous studies have been published on the surface structure of the natural rubber particle [4-, none of these offered a direct in situ visualization of the intact particle surface. This is because of any attempt to remove this surface layer of proteins and lipids results in an immediate destabilization of the latex. The second part focused on the using of Atomic Force Microscopy (AFM) and Confocal Fluorescence microscopy to visualize and delineate the structure of the proteins and lipids layer on the latex particle surface in situ.

Influence of non-rubber components on film formation behavior of natural rubber latex

2020 ◽  
Vol 298 (9) ◽  
pp. 1263-1271
Author(s):  
Yan-Chan Wei ◽  
Jie-Hui Xia ◽  
Ling Zhang ◽  
Ting-Ting Zheng ◽  
Shuangquan Liao
Keyword(s):  
Natural Rubber ◽  
Film Formation ◽  
Natural Rubber Latex ◽  
Rubber Latex ◽  
Formation Behavior
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