期刊
POLYMER ENGINEERING AND SCIENCE
卷 62, 期 3, 页码 841-847出版社
WILEY
DOI: 10.1002/pen.25890
关键词
epitaxial polymer crystallization; graphene; grazing-incidence x-ray diffraction; matrix-assisted pulsed laser evaporation; melting
资金
- Air Force Office of Scientific Research [FA9550-18-1-0300]
- National Science Foundation (US) [DMR-1420541, DMR-2011750]
- Brookhaven National Laboratory [DE-SC0012704]
The morphology and orientation of polymer crystals are crucial in polymer-based technologies. We used polymer-substrate epitaxy and matrix-assisted pulsed laser evaporation (MAPLE) to achieve a highly oriented crystalline morphology. MAPLE allows for improved control over crystalline morphology and growth of crystalline lamellae.
The morphology and orientation of polymer crystals are important factors which determine the performance of thin-film, polymer-based technologies such as organic electronic devices and gas separation membranes. Here, we utilize polymer-substrate epitaxy to achieve a highly oriented crystalline morphology during thin-film processing. To accomplish this, we employ matrix-assisted pulsed laser evaporation (MAPLE), a slow physical vapor deposition process, to deposit linear polyethylene epitaxially atop a graphene substrate. Via MAPLE, we demonstrate the ability to achieve a film morphology comprised of well-aligned, edge-on crystalline lamellae. Furthermore, we show that MAPLE can be exploited to grow crystalline lamellae composed entirely of extended polymer chains which exhibit a near-equilibrium melting temperature. Our study demonstrates that MAPLE, as a bottom-up approach, can deposit polymer thin films with improved control over crystalline morphology.
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