Dilatometric Study on Transition Phenomena of Various Polyethylenes with Different Degree of Chain Branching
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概要
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The specific volumes of various kinds of polyethylenes with the different degrees of short chain and long chain branchings were measured by volume dilatometry in the temperature range from －40° to 150°C, and volume-temperature curves were determined. Polyethylene having the higher degree of short chain branching had the higher specific volume at any temperature below the melting point. Above the melting point specific volumes of all the polyethylenes were equal at the same temperature. Melting point, crystallizing temperature, premelting point, and glass transition temperature were raised with the decrease of degree of short chain branching. The curvature of the curve showing premelting process grew large as the amount of short chain branching contained in the sample became small, and came to show the typical first order transition phenomenon.
- 社団法人 日本化学会の論文
著者
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TANAKA K.
Department of Materials Science, Kyoto University
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Tanaka Koji
Department of Chemistry Faculty of Science Tokyo College of Science
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