期刊
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
卷 43, 期 23, 页码 3438-3443出版社
WILEY
DOI: 10.1002/polb.20634
关键词
crystallization; heterogeneous; homogeneous; memory; nucleation; polyethylene (PE); seeding; self-nucleation
We study crystal nucleation within an ensemble of polyethylene droplets created through the dewetting of a thin film on an unfavorable substrate. In particular, we employ standard thermal treatment procedures to induce self-nucleation in samples to gain some insight into the nature of this enhanced crystallization. The novel sample-geometry enables the monitoring of each droplet throughout successive experiments, and hence the changes in their nucleation mechanism for various thermal treatments. We find a consistent self-nucleated crystallization temperature of similar to 101 degrees C under all conditions, suggesting uniformity in the centers which facilitate nucleation. Using correlation plots, we demonstrate that the observed melt-memory effects have a stochastic rather than deterministic nature; self-nucleation is a random process. (c) 2005 Wiley Periodicals, Inc.
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