ISSN:
1022-1352
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Recent models on the melting process of polymer crystals allow the study of semicrystalline polymer structures by calorimetric (DSC) measurements. In particular, this work is devoted to the study of those changes occurring during the deformation process of isotactic poly(propylene) samples along the transition front. By observing the evolution of the parameter of intrachain melting cooperativity in comparison with lamellar thickness, it has been possible to characterise the birth and further evolution of double fold molecules, totally extended polymer chains connecting two adjacent crystallites in the fibrillar structure, “taut tie molecules”. Furthermore, those structural changes depend on the stretching conditions. In general, low rate promotes high lamellar fragmentation and the presence of a small number of taut tie molecules. On the contrary, at higher rates crystallites coming from the original lamella show bigger size and a higher number of tie molecules are achieved.
Additional Material:
8 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/macp.1996.021971017
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