Physical evaluation of small samples of plastics
| Autor: | J. J. Millane, C. E. Hollis, K. H. C. Bessant, M. G. Dilke |
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| Rok vydání: | 2007 |
| Předmět: | |
| Zdroj: | Journal of Applied Chemistry. 2:501-510 |
| ISSN: | 1934-998X 0021-8871 |
| DOI: | 10.1002/jctb.5010020902 |
| Popis: | Experimental methods are described for the evaluation of the important mechanical properties of (a) hard plastics, (b) elastomers, when only small amounts of the materials are available. For thermoplastics of type (a), the impact strength was determined by a Charpy-type test on notched square-section bars of dimensions 4 cm. × 0·3 cm. × 0·3 cm. cut from strain-free moulded plates. Softening point was determined by measuring the dilatometric second-order transition temperature. A qualitative indication of moulding properties was obtained using an Atkinson–Nancarrow plastometer. For materials of type (b), tensile and elongation testing of dumb-bell specimens in which the effective portion measures 20 mm. × 5·3 mm. × 0·5 mm. gave reproducible results for plasticized polyvinyl chloride. Details of methods of preparing the stock, if high reproducibility is to be obtained, are given. Refractometric determination of second-order transition temperature was used to measure the brittle temperature. Resilience testing was carried out on specimens measuring 1 cm. × 1 cm. × 4 mm., the apparatus being described. A method for investigating the volatility of plasticizers in small specimens of plasticized polyvinyl chloride is given. |
| Databáze: | OpenAIRE |
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