Phthalate ester plasticizers in freshwater systems of Venda
Phthalate ester plasticizers were determined in rivers and dams of the Venda region, South Africa. Liquid-liquid extraction, column chromatographic clean-up and capillary gas chromatography were the methods used for the quantitative analyses.
Plasticiser loss from plastic or rubber products through
One of the main degradation mechanisms of plasticised-polymer products is the loss of plasticiser, which leads to poorer mechanical properties and eventual contamination of the surrounding...
Phthalate ester plasticizers in freshwater systems of Venda
Phthalate ester plasticizers in freshwater systems of Venda, South Africa and potential health effects OS Fatoki1*, M Bornman2, L Ravandhalala3, L Chimuka4, B Genthe5 and A Adeniyi6 1 Department of Chemistry, Faculty of Applied Sciences, Cape Peninsula University of Technology, PO Box 652, Cape Town 8000, South Africa
Plasticizer - an overview | ScienceDirect Topics
Within a given series of esters having a common acid group, plasticizer efficiency increases as the molecular weight of the plasticizer decreases. Plasticizer efficiency improves as the linearity of the alcohol chain also increases. Sign in to download full-size image Figure 3. Hardness versus Plasticizer Concentration View chapter Purchase book
SUPRMIX PLASTHALL DBS | Hallstar Industrial
Improves Handling Improves Safety Reduces employee exposure Reduces waste Reduces clean up time The information presented herein is believed to be accurate and reliable, but no warranty or guarantee, expressed or implied, is made regarding the information or the performance of any product.
- Do neoprene vulcanizates need ester plasticizers?
- In neoprene vulcanizates at temperatures to -40°C, ester plasticizers are required in order to maintain and increase flexibility. The use of these esters, however, tends to increase the crystallization rate of susceptible grades.
- How do ester plasticizers affect crystallization rate?
- Unfortunately, the use of ester plasticizers does not usually help prevent crystallization and, in many cases, will actually accelerate the crystallization rate. Crystallization effects and Tg must both be considered when designing neoprene materials for low-temperature service.
- Which ester plasticizers were tested?
- Six Hallstar ester plasticizers were mixed into a neoprene WK compound and evaluated to assess the plasticizer effects on the crystallization rate. The results show Paraplex® G-62 interferes with the cure system used in our standard neoprene WK recipe.
- Do neoprene materials have crystallization effects?
- When designing neoprene materials for low-temperature service, both crystallization effects and Tg must be considered. Unfortunately, the use of ester plasticizers, which are commonly used to lower the Tg of a material, does not usually help prevent crystallization and will actually accelerate the crystallization rate in many cases.
- Can polymeric plasticizers retard neoprene crystallization?
- The use of polymeric plasticizers and hydrocarbon or coumarone-indene resins can retard crystallization; however these additives do not improve the neoprene materials low temperature flexibility. In applications where temperature flexibility is less critical than self-extinguishing characteristics in the material, phosphates tend to be used.
- Can neoprene be used as a base polymer?
- The WK grade of neoprene cannot be used as a base polymer in neoprene compounds subjected to crystallization testing designed to determine the effects of plasticizers on the crystallization rate. It is designed to have maximum crystallization resistance, thus resulting in an unacceptably long time to obtain experimental results.
