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- W2000993024 abstract "The temperature-dependence of specific volume, rigidity modulus, and mechanical losses of plasticized and unplasticized cellulose acetates in the temperature range −100 to +200°C. has been studied. Two cellulose acetates, a triacetate and a cellulose (2.2) acetate were used, these being plasticized with varying amounts of either benzyl acetate, m-cresol, o-ethylphenol, γ-butyrolactone, monomethylaniline, benzylphenol, or Santophen 7 (a phthallyl glycolate). The specific volume measurements, made using an extremely sensitive dilatometer, indicated three apparent second-order transitions and one first-order (melting) transition in cellulose triacetate and three or possibly four apparent second-order transitions but no first-order transition in the cellulose (2.2) acetate. Both the first-order and second-order transitions were depressed by the addition of plasticizer, the depression being most marked with the phenolic-type plasticizers. Because of polymer decomposition at temperatures above 200°C., it was not possible to study the melting of mixtures containing less than 30% plasticizer and subsequently no reliable values for the melting temperature, the entropy, and the heat of crystallization could be determined. Rigidity modulus measurements, obtained using a torsional pendulum technique and the mechanical loss (damping) measurements, confirmed the existences of these second-order transitions in both acetates and indicated that only the highest temperature transition, 175°C. in the triacetate and 195°C. in the secondary acetate, had the characteristics of a normal glass to rubber transition." @default.
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- W2000993024 date "1957-06-01" @default.
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- W2000993024 title "Transitions in plasticized and unplasticized cellulose acetates" @default.
- W2000993024 doi "https://doi.org/10.1002/pol.1957.1202510807" @default.
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