Rastogi S., Terry A.E.
Eindhoven University of Technology, NL
Keywords: chain mobility, interphase, nmr, polymers, X-ray
In semi-crystalline polymers, a range of morphologies can be obtained in which a chain may traverse the amorphous region between the crystals or fold back into the crystals leading to adjacent or non-adjacent re-entry, depending on the molecular architecture and crystallization conditions. This causes topological variations on the crystal surface and the occurrence of an interphase between the crystalline and amorphous domains, thus affecting the mechanical properties. With the help of dynamic NMR we will show influence of interphase in chain mobility from amorphous to crystalline domains and its implications in solid-state deformation, lamellar thickening and melting of thus crystallized samples.With a series of time resolved techniques we will also demonstrate that though in linear polymers extended chain crystals are thermodynamically most favorable however, this condition is not realized in a range of polymers, such as those which do not show lamellar thickening or in branched polymers where the side branches cannot be incorporated within the crystal. The experimental observations are that when given sufficient time and chain mobility, although extended chain crystals are not achievable, the chains still disentangle and a thermodynamically stable morphology is formed with a disentangled crystallizable interphase.Reference:Advances in Polymer Science 2005, 180, 161-194
Journal: TechConnect Briefs
Volume: 2, Technical Proceedings of the 2006 NSTI Nanotechnology Conference and Trade Show, Volume 2
Published: May 7, 2006
Pages: 697 - 700
Industry sectors: Advanced Materials & Manufacturing | Personal & Home Care, Food & Agriculture
Topic: Personal & Home Care, Food & Agriculture
ISBN: 0-9767985-7-3