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Polymer Research (polymer + research)

Distribution by Scientific Domains

Polymers and Materials Science	75%

Selected Abstracts

High-Throughput and Combinatorial Methods in Polymer Research: Their Time Has Come

MACROMOLECULAR RAPID COMMUNICATIONS, Issue 1 2003
Ulrich S. Schubert
No abstract is available for this article. [source]

Trends in industrial polymer research

MACROMOLECULAR SYMPOSIA, Issue 1 2003
Volker Warzelhan
Abstract In the past decades a shift in paradigm took place in industrial polymer research for structural materials. Only a few new polymers based on new monomeric building blocks were developed. The main focus is now on tailoring improved "old polymers" with well-defined structure and properties based on a set of low cost "old" monomers using controlled polymerization mechanisms. [source]

A study of dye molecule diffusion in human hair using positron lifetime spectroscopy

PHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 11 2009
M. N. Chandrashekara
Abstract The diffusion behavior of a commercial permanent liquid hair dye in human hair has been investigated using Positron Annihilation Lifetime Spectroscopy (PALS) and gravimetric sorption method. The o-Ps lifetime parameters ,3 and I3 decrease rapidly during the first 60 minutes of sorption time. This is understood in terms of dye molecules filling the free volume cavities in hair. The sorption results suggest that the dye molecule diffusion is essentially a Fickian process. In the latter part of the sorption, where positron parameters remain almost constant, mass increase might be due to surface adhesion. These two stages of sorption are well separated by the positron technique. The study shows that the free volume theory and positron technique, widely used in polymer research, may expediently be used to understand hair properties, more importantly diffusion of dye molecules. (© 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]