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Polymeric and non-polymeric materials often crystallize as spherulites when crystallized from viscous melts or solutions at large undercooling. The essential component of a spherulite is fibrillar crystals that grow in predominantly radial directions and branch irregularly. We review the growth, branching and twisting of crystals in the light of theoretical and experimental advances of the last decade,...
Melt crystallization of random copolymers leads to solids with crystalline fraction w c and final melting temperature Tmf that are substantially below the predictions of Flory's equilibrium crystallization theory. Model ethylene/butene random copolymers, when crystallized as multilayer films by rapid solvent evaporation, exhibit increased w c (50% relative) and Tmf (4K) compared to...
The melting temperature of a crystal formed of sequences of a statistical A/B copolymer depends not only on crystal composition and lamellar thickness, but on the composition of the coexisting melt as well. Hence analytical expressions are derived for the final melting temperature, where the melt composition equals the known overall composition, generally expressed as mole fraction x A of...
Small-angle neutron scattering has recently been applied to study liquid-liquid phase separation in blends of branched and linear polyethylenes. While experimental results from two groups are basically the same, interpretations differ strongly. The analyses of Schipp . (Polymer, 1996, 37, 2291), which favour phase separation, are shown to be incorrect. There is no contraction of chain dimensions in...
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