Thermal Expansion and Second-Order Transition Effects in High Polymers: Part I. Experimental Results
- 1 April 1944
- journal article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 15 (4) , 398-405
- https://doi.org/10.1063/1.1707444
Abstract
Experimental values of second-order transition temperatures Tm and of cubical expansion coefficients below and above this temperature are presented for several new materials, notably saran. The thermal expansion behavior of two-component systems of incompatible materials (polystyrene plus polyolefins) has been studied. For relatively coarse dispersions (1000A), Tm is 82°C, independent of composition, while the difference Δβ in cubical expansion coefficient above and below Tm is directly proportional to the volume fraction of polystyrene in the mixture. Unplasticized saran behaves similarly in that Tm is constant while Δβ decreases linearly with increasing crystallinity. For molecular dispersions of incompatible materials both Tm and Δβ are functions of composition. It is shown that for most high polymers Tm increases with increasing intermolecular force constants, while the product of Tm and cubical coefficient of expansion above Tm is roughly constant (0.1 to 0.2).This publication has 17 references indexed in Scilit:
- Vinylidene Chloride PolymersIndustrial & Engineering Chemistry, 1943
- Transition Temperature and Cubical Expansion of Plastic MaterialsIndustrial & Engineering Chemistry, 1942
- The Relation of Dielectric Properties to Structure of Crystalline Polymers. II. Linear PolyamidesJournal of the American Chemical Society, 1942
- Electrical Properties of Solids. VI.1 Dipole Rotation in High Polymers2Journal of the American Chemical Society, 1941
- Über innere und äußere Weichmachung von makromolekularen StoffenAngewandte Chemie, 1940
- The Density, Thermal Expansion, Vapor Pressure, and Refractive Index of Styrene, and the Density and Thermal Expansion of PolystyreneJournal of the American Chemical Society, 1939
- Critical and co-operative phenomena. IV. A theory of disorder in solids and liquids and the process of meltingProceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1939
- A Semi-micro Calorimeter for Measuring Heat Capacities at Low Temperatures1Journal of the American Chemical Society, 1937
- Studies on Glass XIII. Glass Formation by a Hydrocarbon PolymerThe Journal of Chemical Physics, 1936
- Forms of rubber as indicated by temperature-volume relationshipJournal of Research of the National Bureau of Standards, 1934