Spinodal-Assisted Crystallization in Polymer Melts

Spinodal-Assisted Crystallization in Polymer Melts

P. D. Olmsted,1,* W. C. K. Poon,2,† T. C. B. McLeish,1 N. J. Terrill,3 and A. J. Ryan3 1Department of Physics & Astronomy and Polymer IRC, University of Leeds, Leeds LS2 9JT, England 2Department of Physics & Astronomy, The University of Edinburgh, Mayfield Road, Edinburgh EH9 3JZ, Scotland 3Department of Chemistry, University of Sheffield, Brookhill, Sheffield S3 7HF, England (Received 3 Februa...

Nanoparticle Dynamics in Polymer Melts

Reaction Kinetics in Polymer Melts

We study the reaction kinetics of end-functionalized polymer chains dispersed in an unreactive polymer melt. Starting from an infinite hierarchy of coupled equations for many-chain correlation functions, a closed equation is derived for the 2nd order rate constant k after postulating simple physical bounds. Our results generalize previous 2-chain treatments (valid in dilute reactants limit) by ...

History dependent crystallization of Zr41Ti14Cu12Ni10Be23 melts

The crystallization of Zr41Ti14Cu12Ni10Be23 ~Vit 1! melts during constant heating is investigated. ~Vit 1! melts are cooled with different rates into the amorphous state and the crystallization temperature upon subsequent heating is studied. In addition, Vit 1 melts are cooled using a constant rate to different temperatures and subsequently heated from this temperature with a constant rate. We ...

Conditions for metastable crystallization from undercooled melts

The limits of validity of Ostwald’s rule of stages are investigated theoretically in the case of crystallization of undercooled melts. The treatment is within the limits of capillary theory. Two basic models are compared: (1) According to the first one (model A), the phase with lower energy of formation of critical nucleus is predominantly formed. In an enantiotropic-type phase diagram there is...