Document Detail


Morphological instabilities of polymer crystals.
MedLine Citation:
PMID:  18665408     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
We present experimental observations at comparatively low supercooling of morphology transitions from dendritic to faceted structures in polymer crystals growing in thin films of a poly-2-vinylpyridineblock-polyethyleneoxid copolymer. Our results are compared with theoretical concepts describing morphological instabilities of single crystals. Although these concepts originally were not developed for polymers, they allow to describe and interpret our experimental results quite well. In particular, the measured temperature dependence of the width W and frequency of dendritic side branches and the radius of curvature rho of the growth tips of the crystals follow these concepts. We present preliminary evidence for the influence of polymer attachment kinetics and reorganisation processes behind the growth front. Polymer thin films provide valuable model systems for studying general concepts of crystallisation and allow to distinguish at which point the connectivity of the crystallising units within chain-like molecules starts to play a measurable role.
Authors:
N Grozev; I Botiz; G Reiter
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2008-7-29
Journal Detail:
Title:  The European physical journal. E, Soft matter     Volume:  -     ISSN:  1292-895X     ISO Abbreviation:  Eur Phys J E Soft Matter     Publication Date:  2008 Jul 
Date Detail:
Created Date:  2008-7-30     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101126530     Medline TA:  Eur Phys J E Soft Matter     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Institut de Chimie des Surfaces et Interfaces, ICSI-UHA-CNRS, 15, rue Jean Starcky, B.P. 2488, 68057, Mulhouse Cedex, France.
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