Pathway-Dependent Melting in a Low-Molecular-Weight Polyethylene-block-Poly(ethylene oxide) Diblock Copolymer
✍ Scribed by Lu Sun; Yuxiu Liu; Lei Zhu; Benjamin S. Hsiao; Carlos A. Avila-Orta
- Publisher
- John Wiley and Sons
- Year
- 2004
- Tongue
- English
- Weight
- 125 KB
- Volume
- 25
- Category
- Article
- ISSN
- 1022-1336
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✦ Synopsis
Abstract
Summary: In a low‐molecular‐weight polyethylene‐block‐poly(ethylene oxide) (PE‐b‐PEO) diblock copolymer, two pathway‐dependent melting processes were observed: Upon slow heating, the PE lamellar crystals melted at ≈97 °C into a disordered state. However, when the temperature rapidly jumped to above the melting point (e.g., 100 °C), the PE lamellar crystals transformed directly into an ordered lamellar melt, followed by an isothermal conversion into a disordered melt. This isothermal order‐to‐disorder transition was explained by superheating of the PE crystals using a G‐T diagram.
A schematic G‐T diagram explaining the pathway‐dependent double melting for a crystalline polyethylene‐block‐poly(ethylene oxide) copolymer.
imageA schematic G‐T diagram explaining the pathway‐dependent double melting for a crystalline polyethylene‐block‐poly(ethylene oxide) copolymer.