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Adjustment of Solid-Solid Phase Transition Temperature of Polyalcohols by the Use of Dopants*

  • D. Chandra (a1), C. S. Barrett (a1) and D. K. Benson (a2)

Abstract

The transition temperatures of solid-solid phase changes in selected polyalcohols, “plastic crystals,” can be adjusted by using interstitial and substitutional dopants. An investigation is under way of the structural changes in these during heating and cooling, and of the thermodynamic properties such as the transition, temperatures and enthalpy changes, as a function of the percent of dopant. The purpose of the investigation is to find and evaluate materials having potential value In thermal storage applications. Dopants for pentaerythritol discussed in this report are trimethylolpropane (TMP), ammonia, boron trifluoride, pentaglycerine (PG) and neopentylglycol (NPG).

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*

Work supported by contract No. DEWX03-84SF12205 of the Dept, of Energy, San Francisco Operations Office, Oakland, CA.

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1. Benson, D.K., Webb, J.D., Burrows, R.W., McFadden, J.D., and Christensen, C., SERI Report, Task Nos. 1275.00 and 1464.00 WPA304 (Mar. 1985) (available through NTIS. SERI/TR. 55-1828 Category 62e).
2. Timmermans, J., J. Phys. Chem. Solids 18(1):l8 (1961).
3. Chandra, D., Fitzpatrick, J.J., and Jorgensen, G., Adv. in X-Ray Anal. 28: 353-360 (1985).
4. Chandra, D. and Barrett, C.S., Effect of Interlayer and Substitutional Dopants on Thermophysical Properties of Solid State Phase-Change Materials, Topical Report to Dept, of Energy, Contract DE-AC03- 84SF12205, Oct. 1, 1984 to Oct. 15, 1985.
5. Doshi, N., Furimn, M. and Rudisaa, R., Acta Cryst, B-29. 143 (1973).
6. Nitta, I. and Watanabe, X., Science Paper I. P. C. R. 34: 1669 (1938).
7. Llewellyn, F.J., Cos, E.G. and Goodwin, T.H., J. Chem. Soc. 1883 (1937).
8. Eilerman, D. and Rudaan, R., Acta Cryst. B35: 2458-2460 (1979).
9. Nitta, I. and Watanabe, I., Bull. Chem. Soc. Japan 13: 28-35 (1938).
10. Smith, G.W., J. Chem. Phys. 50: 3595-3605 (1969).

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