Zinc Oxide Testing of Latex

1955 ◽  
Vol 28 (4) ◽  
pp. 1211-1220 ◽  
Author(s):  
E. W. Madge ◽  
H. M. Collier ◽  
J. L. M. Newnham
Keyword(s):  
Zinc Oxide ◽  
Natural Rubber ◽  
Mechanical Stability ◽  
Natural Rubber Latex ◽  
Rubber Latex ◽  
Experimental Conditions ◽  
Ammonia Content ◽  
Similar Investigation ◽  
Naturally Occurring ◽  
Viscosity Changes

Abstract Viscosity changes in concentrated natural rubber latex under different experimental conditions were investigated with the object of determining the mechanism of zinc oxide thickening and to find reasons for inconsistencies in correlating results of the zinc oxide thickening or ZOT test with other latex tests. It has been found that small variations of the amount of naturally occurring soap are of great importance in the thickening of latex containing zinc oxide, especially at the low ammonia content used for the ZOT test. The effect of added soap on the ZOT test was found to vary from latex to latex and to be different for different soaps. Less than about 0.3 per cent of various soaps added to latex prior to the zinc oxide reduced the degree and rate of thickening. With more than this amount of soap, the thickening depended on the soap used. A similar investigation in which the mechanical stability of latexes containing varying amounts of added soap and a standard amount of zinc oxide was measured, showed that the latexes varied anomalously with the amount and the type of soap added. The results of the work presented in this paper show that new tests for the zinc sensitivity of latexes must take into account a number of hitherto unsuspected factors, particularly when such tests are required to have a bearing on processing behavior.

Reinforcement of Natural Rubber Latex Film by Starch Nanocrystal

2014 ◽  
Vol 543-547 ◽  
pp. 3886-3891 ◽  
Author(s):  
Yang Jian Shu Gao ◽  
Sen Zhao ◽  
Shuang Quan Liao ◽  
Lin Fang ◽  
Zhi Fen Wang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Natural Rubber ◽  
Acid Hydrolysis ◽  
Mechanical Stability ◽  
Natural Rubber Latex ◽  
Crosslinking Density ◽  
Latex Film ◽  
Latex Films ◽  
Rubber Latex ◽  
Starch Nanocrystals

Starch nanocrystals obtained from acid hydrolysis, and the starch/natural rubber latex film was prepared by blending the starch nanocrystals with natural rubber latex. The latex properties such as viscosity and mechanical stability, water and toluene uptake, crosslinking density and mechanical properties of the latex films were investigated. The results showed that the mechanical stability of natural rubber latex reinforced by starch nanocrystals increased, but the change of viscosity was not obvious. By adding starch nanocrystals in natural rubber latex, the swelling by toluene decreases and the swelling by water increased. The mechanical properties and crosslinking density of films were enhanced with the increase of starch loading.

The Natural Rubber/Zinc Oxide Nanocomposites: Its Morphology, Mechanical and Thermal Decomposing Properties

2014 ◽  
Vol 936 ◽  
pp. 394-399 ◽  
Author(s):  
Ming Zhe Lv ◽  
Lei Fang ◽  
Pu Wang Li ◽  
Chun Liang Yang
Keyword(s):  
Zinc Oxide ◽  
Natural Rubber ◽  
Antibacterial Effect ◽  
Aqueous Suspension ◽  
Natural Rubber Latex ◽  
Rubber Latex ◽  
Thermogravimetric Analyzer ◽  
Aging Resistance ◽  
Average Size ◽  
Scanning Electron

Natural rubber /Zinc Oxide (NR/ZnO) nanocomposites are fabricated by blending natural rubber latex with aqueous suspension of nanoZnO particles. Its morphology and thermal/thermooxidative ageing resistance are investigated with scanning electron microscopy (SEM) and thermogravimetric analyzer (TGA). The results show that the mechanical properties of NR is greatly improved by the incorporation of nanoZnO, nanoparticles, which are homogenously distributed throughout NR matrix as nanoclusters with an average size of 80 nm when the ZnO loading is less than 4 wt%. The thermal/thermooxidative aging resistance of NR/ZnO nanocomposites is compared to the pure NR. It is found that the introduction of nanoZnO has no obvious impact to the thermal decomposing properties of NR matrix. ZnO/NR composites possess excellent antibacterial effect.

Enhancement of the antibacterial activity of natural rubber latex foam by the incorporation of zinc oxide nanoparticles

2013 ◽  
Vol 131 (1) ◽  
pp. n/a-n/a ◽  
Author(s):  
W. G. I. U. Rathnayake ◽  
H. Ismail ◽  
A. Baharin ◽  
I. M. C. C. D. Bandara ◽  
Sanath Rajapakse
Keyword(s):  
Zinc Oxide ◽  
Antibacterial Activity ◽  
Natural Rubber ◽  
Zinc Oxide Nanoparticles ◽  
Natural Rubber Latex ◽  
Oxide Nanoparticles ◽  
Rubber Latex

A novel computer vision approach to classify the mechanical stability of natural rubber latex concentrate

2018 ◽  
Vol 12 (3) ◽  
pp. 323-334
Author(s):  
Ming Chieng Tan ◽  
Chee Seng Chan ◽  
Weng Kin Lai ◽  
Khoon Hee Chew ◽  
Ping Yong Chua
Keyword(s):  
Computer Vision ◽  
Natural Rubber ◽  
Mechanical Stability ◽  
Natural Rubber Latex ◽  
Rubber Latex

scholarly journals The Staining of Polymers

2002 ◽  
Vol 10 (5) ◽  
pp. 5-7
Author(s):  
Ronald W. Smith
Keyword(s):  
Electron Microscopy ◽  
Natural Rubber ◽  
Natural Rubber Latex ◽  
Optical Microscope ◽  
Hot Water ◽  
Polymeric System ◽  
Rubber Latex ◽  
Naturally Occurring ◽  
Contrast Mechanism ◽  
In The Beginning

In the beginning there was water-the first stain that delineated structure within a polymeric system. The polymerwas natural rubber (NR) and the system was an air-dried film of natural latex. Grenquist reported in 1929 that a dried film of natural rubber latex soaked in hot water became milky (Figure 1) and, at that stage, the latex particles could be detected by the optical microscope (OM), The contrast mechanism was provided by the absorption of water by the naturally occurring proteinaceous layers present on the congealed NR particle surfaces. There was little demand for polymer staining until the age of electron microscopy.

Effect of Storage Conditions on the Properties of Latex. I.

1956 ◽  
Vol 29 (4) ◽  
pp. 1502-1508 ◽  
Author(s):  
H. M. Collier
Keyword(s):  
Natural Rubber ◽  
Acid Content ◽  
Ammonium Acetate ◽  
Mechanical Stability ◽  
Natural Rubber Latex ◽  
Storage Conditions ◽  
Rubber Latex ◽  
Air Space ◽  
Stability Time

Abstract Working with ammonia-preserved natural-rubber latex, concentrated by centrifuging, the author shows that the slight fall in mechanical stability associated with the shipment of bulk supplies of latex can be explained by the fact that, during shipment, latex does not have access to the oxygen of the air. The mechanical stability of samples taken at the time of shipment increased in value when there was an appreciable air-space in the storage bottle, but fell when the bottle was full and air was excluded. These differences were accentuated when air was replaced by oxygen and was then possible to find marked differences not only in mechanical stability time but also in the volatile fat acid content of the latexes. The increase of volatile fat acid content of the samples stored in the absence of air was much greater than in the sample stored in the presence of oxygen. The fall of mechanical stability in the absence of air is ascribed to the formation of increasing quantities of salts, such as ammonium acetate. In the presence of oxygen, the rate of formation of salts of this type is very much less, and at the same time other changes take place which lead to a marked increase of mechanical stability.

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