Growth Shape of Isotactic Polystyrene Crystals in Thin Films

Details Growth Shape of Isotactic Polystyrene Crystals in Thin Films Growth Shape of Isotactic Polystyrene Crystals in Thin Films

2001-03-13

arxiv.org/abs/cond-mat/0103267v2

Physics

Condensed Matter

Soft Condensed Matter

7 pages, 8 figures (EPS), LaTeX, accepted for publiaction in Polymer

Scientific paper

The crystal growth of isotactic polystyrene (it-PS) is investigated in very thin, 11 nm thick films. The it-PS crystals grown in the thin films show quite different morphology from that in the bulk. With decreasing crystallization temperature, the branching morphology in a diffusion field appears: dendrite and compact seaweed. The branching morphology is formed through a morphological instability caused by the gradient of film thickness around a crystal; the thicker the film thickness, the larger the lateral growth rate of crystals. Regardless of the morphological change, the growth rate as well as the lamellar thickness depends on crystallization temperature as predicted by the surface kinetics.

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