ISSN:
0025-116X
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
The long spacings of several samples of poly(3,3-dimethyloxetane) (PDMO) were determined by small-angle X-ray diffraction as a function of molecular weight and crystallization temperature, in the interval where only the monoclinic modification is produced. The equilibrium melting temperature and the basal interfacial free energy of the mature crystals were determined from the correlation between long spacings and melting temperatures. Finally, an estimation of the critical sizes of the nuclei was made from nucleation theory, and the results were compared with the actual sizes of the crystallites, assuming a two-phase model. Our results show that both the nuclei and the mature crystals have rather small sizes, which is attributed to the high under-coolings involved in the crystallization of PDMO.
Additional Material:
3 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/macp.1989.021900317
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