Journal
LANGMUIR
Volume 25, Issue 17, Pages 9960-9968Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la901108p
Keywords
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Funding
- National Natural Science Foundation of China [50773080, 20834005]
- Chinese Academy of Sciences [KJCX2-YW-M11]
- Ministry of Science and Technology of China [2009CB930603]
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The transition of lamellar crystal orientation from flat-on to edge-on in ultrathin films of polystyrene-b-poly(ethylene oxide) (PS-b-PEO) via solvent vapor (toluene) treatment Was investigated. When the as-prepared film was treated in saturated solvent vapor, breakout crystals could form quickly, and then they transformed from square single crystals (flat-on lamellae) to dendrites and finally to nanowire crystals (edge-on lamellae). Initially, heterogeneous nucleation tit the polymer/substrate interface dominated the structure evolution, leading to flat-on lamellar crystals orientation. And the transition from faceted habits to dendrites indicated a transition of underlying mechanism from nucleation-controlled to diffusion-limited growth. As the solvent molecules gradually diffused into the polymer/substrate interface, it will subsequently weaken the polymer-substrate interaction. In this case, lower free energy lamellae of an edge-on orientation could be obtained by the gain of free volume of the soluble PS block.
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