6533b7dafe1ef96bd126e9af
RESEARCH PRODUCT
On the formation of lamellae during annealing of extended chain crystals of radiation-polymerized trioxane
T. AmanoG. HinrichsenE. W. Fischersubject
Materials sciencePolymers and PlasticsTrioxaneScatteringAnnealing (metallurgy)General ChemistryAtmospheric temperature rangeCondensed Matter Physicslaw.inventionchemistry.chemical_compoundCrystallographyLamella (surface anatomy)chemistrylawDifferential thermal analysisMaterials ChemistryMelting pointElectron microscopedescription
Abstract The structure changes of radiation-polymerized trioxane taking place during annealing have been studied by means of electron microscopy, X-ray small- and wide-angle scattering, and differential thermal analysis. The original fibrillar crystals, supposedly consisting of extended chains, change into lamellar crystals due to annealing at temperatures between 150° and 190°C. Lamella formation can be connected with the appearance of a long period of about 200A which is not observed in the unannealed sample. During annealing within the same temperature range the X-ray reflections due to the twin structure of the original polytrioxane disappear, whereas the orientation of the fraction with its c-axis parallel to the c-axis of the parent trioxane remains unaltered. The melting point of the lamellar crystals obtained by annealing is 186°-187°C and, therefore, considerably higher than the melting point (175°C) of crystals grown during cooling of a polytrioxane melt. The equilibrium melting point of an undi...
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1969-06-01 | Journal of Macromolecular Science, Part B |