Effect of Peperidine on Rubber Solutions
| Autor: | A. Soininen, A-L. Pehu-Lehtonen, W. Bäsk |
|---|---|
| Rok vydání: | 1964 |
| Předmět: |
Polymers and Plastics
biology Chemistry Infrared spectroscopy biology.organism_classification chemistry.chemical_compound Viscosity Natural rubber visual_art Polymer chemistry Materials Chemistry visual_art.visual_art_medium Molecule Organic chemistry Amine gas treating Piperidine Stoichiometry Hevea |
| Zdroj: | Rubber Chemistry and Technology. 37:477-485 |
| ISSN: | 1943-4804 0035-9475 |
| DOI: | 10.5254/1.3540338 |
| Popis: | In the experiments which have been described, the viscosity measurement served as an indicator to establish the amount of piperidine required for a substantial viscosity reduction. The bend in the viscosity curves for the 5% crepe solutions occurred for a piperidine addition of about 3×10−5 moles. The quantity appears to be in stoichiometric relation to the rubber used. Therefore we come to the view of Meyer, that rubber exhibits associating, oxygen-containing groups. Accordingly, the strong effect of piperidine in lowering the viscosity is due to the action of this amine in splitting all the association bonds of the oxygen-containing groups in the rubber molecules. Not only the weak alcohol and keto bonds are concerned but also the strong carboxyl bonds. Infrared spectroscopy also has shown that Hevea rubber contains a rather large portion of such groups. These probably are first formed in the processing of the latex. It is quite possible that the rubber molecules associate with the help of carboxyl groups, as carboxylic acids generally do, and form the relatively stable dimer compound shown below with two hydrogen bonds |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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