scholarly journals Characterization of Epoxidized Natural Rubber for Coating Application

2018 ◽  
Vol 56 (3B) ◽  
pp. 169
Author(s):  
Nguyen Thu Ha ◽  
Nguyen Hong Quan ◽  
Cao Hong Ha ◽  
Nguyen Pham Duy Linh ◽  
Phan Trung Nghia
Keyword(s):  
Contact Angle ◽  
Natural Rubber ◽  
Bending Strength ◽  
Epoxy Group ◽  
Angle Measurement ◽  
Bending Test ◽  
Epoxidized Natural Rubber ◽  
Coating Application ◽  
Group Content

Epoxidized natural rubber was prepared by epoxidation of natural rubber with fresh peracetic acid in latex stage. The epoxidized natural rubbers with epoxy group content of 8, 15 and 27 mol% were prepared by adjusting the amount of fresh peracetic. The characterization of resulting materials was carried out through NMR spectroscopy, gel content determination and particle size measurement. The epoxidized natural rubber with various epoxy group contents were coated on the surface of the wood substrate by spin coating technique. The contact angle measurement and bending test were made for wood coated by epoxidized natural rubbers. The results show that the obtained epoxidized natural rubber is liquid resistance as is evident in high contact angle of water and poly(ethylene glycol) solution on the rubber surface. The bending strength of wood is improved by coating epoxidized natural rubber. The material with epoxy group content of 15 mol% is suitable for the protection of the wood surface.

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.

Physicochemical characterization of actinomycetes isolated from decayed cedar wood: contact angle measurement

2014 ◽  
Vol 28 (20) ◽  
pp. 2046-2053 ◽  
Author(s):  
Hajar Maataoui ◽  
Hassan Barkai ◽  
Moulay Sadiki ◽  
Abdellatif Haggoud ◽  
Saad Ibnsouda Koraichi ◽  
...  
Keyword(s):  
Contact Angle ◽  
Physicochemical Characterization ◽  
Contact Angle Measurement ◽  
Angle Measurement

SYNTHESIS AND CHARACTERIZATION OF SUPERHYDROPHOBIC ZnO HIERARCHICAL STRUCTURES

NANO ◽  
2011 ◽  
Vol 06 (03) ◽  
pp. 265-269 ◽  
Author(s):  
QUNBING ZHANG ◽  
SHIHE CAO ◽  
JUN WANG
Keyword(s):  
Contact Angle ◽  
Hydrothermal Process ◽  
Hierarchical Structures ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Zno Films ◽  
Water Contact ◽  
Simple Method ◽  
Microscopy Images

ZnO films with well-aligned hierarchical structures have been successfully synthesized at moderate temperatures using a simple catalyst-free hydrothermal process. The synthesized ZnO films are found to be single-phase, with a hexagonal wurtzite-type structure. Scanning electron microscopy images show that the well-aligned hierarchical structures are assembled with interlaced parallel sheets grown on the (400) silica surface. The water contact angle measurement indicates that the water on the films has a contact angle of about 156.3°. This clearly demonstrates that the ZnO films synthesized by this simple method have superhydrophobic properties and may be important for applications in self-cleaning surfaces, biology, and so on.

scholarly journals Dynamics on Molecular Films. Surface Characterization of Monolayers by the Wilhelmy-type Dynamic Contact Angle Measurement.

Hyomen Kagaku ◽  
2000 ◽  
Vol 21 (10) ◽  
pp. 643-650
Author(s):  
Koji ABE ◽  
Satomi OHNISHI ◽  
Haruhisa AKIYAMA ◽  
Hiroshi TAKIGUCHI ◽  
Kaoru TAMADA
Keyword(s):  
Contact Angle ◽  
Surface Characterization ◽  
Dynamic Contact Angle ◽  
Dynamic Contact ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Molecular Films

Fabrication and Characterization of Epoxidized Natural Rubber-Chitosan Membrane

2013 ◽  
Vol 844 ◽  
pp. 205-208 ◽  
Author(s):  
Wirach Taweepreda ◽  
Anuchit Wichianchom
Keyword(s):  
Ionic Conductivity ◽  
Natural Rubber ◽  
Natural Rubber Latex ◽  
Chitosan Solution ◽  
Epoxidized Natural Rubber ◽  
Ether Linkage ◽  
Ft Ir ◽  
Lcr Meter ◽  
Ft Ir Spectroscopy

The membranes obtained from the mixtures of epoxidized natural rubber latex (ENR) and chitosan solution were prepared and characterized. The chemical structure of the membrane was confirmed by ATR-FT-IR spectroscopy and found the peak at 1315 and 1155 cm-1 indicated ether linkage was formed between epoxide group and chitosan corresponding with an enhancement of their mechanical properties which were observed using dynamic mechanical thermal analysis (DMTA). The dielectric properties and ionic conductivity of membrane were investigated using LCR meter and found that the ionic conductivity was increased with increasing the chitosan content.

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