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- W209136632 abstract "Abstract Although the plastic crystal phenomenon has been observed by others in such tetrahedral substances as neopentane, pentaerythrityl fluoride, tertiary butyl halides, and pentaerythritol, we have found that with few exceptions the property can be observed in compounds CR 1 R 2 R 3 R 4 , where R's are methyl, methylol, amino, and carboxy. Larger groups, such as ethyl, bromomethyl, iodomethyl, carboxymethyl, etc . inhibit the solid—solid transition. New enthalpy of transition data are presented for 2-hydroxymethyl-2-methyl-1,3-propanediol, 2,2-dimethyl-1,3-propanediol, 2,2-dimethyl-1-propanol, 2-amino-2-hydroxymethyl-1,3-propanediol, 2-amino-2-methyl-1,3-propanediol, 2-hydroxymethyl-2-nitro-1,3-propanediol, 2-methyl-2-nitro-1,3-propanediol, 2,2-dimethylpropionic acid, and 2,2-bis(hydroxymethyl)propionic acid. In all of these substances, the entropy of fusion is approximately equal to the communal entropy. Transition entropies, however, reflect new reorientation possibilities, often considered a property of the liquid state, but which have been demonstrated by others with the use of n.m.r. and dielectric studies to also be a property of the mesocrystalline phase. Because of the many reorientation possibilities in these substances, transition entropies may be very high, and on the basis of these data and data in the literature the following order of the contribution of various groups can be established: Owing to the low enthalpies of fusion, traces of impurities can often significantly lower and broaden the fusion temperature, but the transition temperatures are less affected, are often very sharp, and more readily characterized the substance." @default.
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- W209136632 date "1970-08-01" @default.
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- W209136632 title "Solid—solid phase transitions determination by differential scanning calorimetry" @default.
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- W209136632 doi "https://doi.org/10.1016/0040-6031(70)80022-3" @default.
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