Scanning electron microscopy studies on tensile failure of thermoplastic elastomers from polypropylene-natural rubber blends

1985 ◽  
Vol 12 (2) ◽  
pp. 157-170 ◽  
Author(s):  
Baby Kuriakose ◽  
S.K. Chakraborty ◽  
S.K. De
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Natural Rubber ◽  
Thermoplastic Elastomers ◽  
Tensile Failure ◽  
Rubber Blends ◽  
Scanning Electron

Mechanical and Morphological Properties of Sulfur-Cured Natural Rubber/Polyethylene/Epoxidized Natural Rubber Blends

2017 ◽  
Vol 757 ◽  
pp. 14-18
Author(s):  
Kritsada Phatcharasit ◽  
Wirach Taweepreda ◽  
Patompong Phummor
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Tensile Strength ◽  
Natural Rubber ◽  
Epoxidized Natural Rubber ◽  
Morphological Properties ◽  
Rubber Blends ◽  
Compression Set ◽  
Internal Mixer ◽  
Scanning Electron

The polymer blend was prepared from natural rubber (NR) and polyethylene (PE) powder blended with epoxidized natural rubber (ENR) by using an internal mixer. In this study, epoxidized natural rubber (ENR) was used as compatibilizer for the blends. Blending ENR with PE powder and NR were prepared at various compositions from 0-20% by weight. Then, specimens from the blends were produced by compression molding at 150 °C. The mechanical and morphological properties of the composites were investigated. It was found that the addition of ENR content has improved the tensile strength, compression set and hardness for the ternary compositions composed of NR/PE powder/ENR compared to the binary one (i.e. NR/PE powder). ENR contributed to a better dispersion between the NR and PE phases as observed in the scanning electron microscopy.

Influence of the Treatment with Sulfuric Acid on Adhesion of Natural Rubber and Cast Polyurethane Elastomers

2012 ◽  
Vol 452-453 ◽  
pp. 86-90 ◽  
Author(s):  
Zhi Yi Zhang ◽  
Hui Jun Niu ◽  
Jia Jia Zhang ◽  
Yan Yun Cui
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Contact Angle ◽  
Sulfuric Acid ◽  
Natural Rubber ◽  
Angle Measurement ◽  
Polyurethane Elastomers ◽  
Adhesion Properties ◽  
Rubber Surface ◽  
Scanning Electron

In this study, natural rubber (NR) was treated with sulfuric acid to improve its adhesion properties to polar polymer. T-peel strength tests, scanning electron microscopy, contact-angle measurement (water), Energy Dispersive X-ray Detector were used to analyze the nature of the NR surface modifications which were carried out with sulfuric acid. A noticeable decrease in contact angle was observed on the rubber surface by contact-angle measurements which can be ascribed to the increase of oxidized moieties on the rubber surface. EDX revealed that oxidized moieties were created through treatment with sulfuric acid. The surface modification and mode of bond failure were studied by scanning electron microscopy (SEM). Immersion in sulfuric acid for 15min produced the maximum adhesion strength (10kN/m) and produced a mixed failure mode (interface & rubber failure in the rubber). Treatment with sulfuric acid produced improved wettability as well as chemical (surface oxidation) and morphological modifications (roughness) of the rubber surface.

scholarly journals Curing characteristics of chlorosulphonated polyethylene and natural rubber blends

2005 ◽  
Vol 70 (5) ◽  
pp. 695-703 ◽  
Author(s):  
Gordana Markovic ◽  
Blaga Radovanovic ◽  
Jaroslava Budinski-Simendic ◽  
Milena Marinovic-Cincovic
Keyword(s):  
Electron Microscopy ◽  
Natural Rubber ◽  
Morphological Analysis ◽  
Blend Ratio ◽  
Rubber Blends ◽  
Curing Characteristics ◽  
Compatibility Factor ◽  
Chlorosulphonated Polyethylene ◽  
Blend Ratios ◽  
Scanning Electron

The dependence of the Mooney scorch time and cure index on the blend ratio of chlorosulphonated polyethylene/natural rubber (CSM/SMR 20 CV) and chlorosulphonated polyethylene/chlorinated natural rubber (CSM/Pergut S 40) blends were determined in the temperature range from 120 oC to 160 oC using a Monsanto Mooney viscometer. Semi-efficient vulcanization systems were used for the study. The morphology of the fracture surface of the crosslinked systems was determined by Scanning Electron Microscopy (SEM). The results showed that the scorch time decreased with increasing SMR 20 CV and Pergut S 40 contents. This observation is attributed to the increasing solubility of sulfur, as the content of SMR 20 CV and Pergut S 40 in the composition increased. For temperatures greater than 140 oC, the dependence of the scorch time on blend ratios diminishes, as enough thermal energy is available to overcome the activation energy of vulcanization. The differing curing characteristics of the two blends is explained by the compatibility factor of the respective blend. Morphological analysis of the blends shows a very satisfactory agreement.

scholarly journals Structural and physico-mechanical properties of natural rubber/GTR composites devulcanized by microwaves: Influence of GTR source and irradiation time

2018 ◽  
Vol 52 (22) ◽  
pp. 3099-3108 ◽  
Author(s):  
Xavier Colom ◽  
Marc Marín-Genescà ◽  
Ramon Mujal ◽  
Krzysztof Formela ◽  
Javier Cañavate
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Natural Rubber ◽  
Irradiation Time ◽  
Rubber Composites ◽  
Tire Rubber ◽  
Ground Tire Rubber ◽  
Scanning Electron

Ground tire rubber from car and truck was modified using microwave irradiation at variable time. The irradiated ground tire rubber was used as filler in composites based on natural rubber. The composites, with high content of ground tire rubber, were prepared using an internal batch mixer and subsequently cross-linked at 160℃. The influence of the ground tire rubber source (car/truck) and irradiation time on structure, physico-mechanical behaviour, thermal properties and morphology of natural rubber/ground tire rubber composites was studied. The interfacial interactions between ground tire rubber and natural rubber as function of ground tire rubber source and irradiation time were evaluated by Fourier transform infrared spectroscopy, thermogravimetric analysis, tensile tests, swelling measurements and scanning electron microscopy. The results showed that irradiation of ground tire rubber slightly enhanced tensile properties and cross-link density of natural rubber/ground tire rubber composites. This effect was more evident in the case of ground tire rubbertruck because of its higher content of natural rubber and was reflected in changes in the interfacial adhesion, which were confirmed by the results of Fourier transform infrared spectroscopy, thermogravimetric analysis and scanning electron microscopy analysis.

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