Crystal Growth Transition from Flat-On to Edge-On Induced by Solvent Evaporation in Ultrathin Films of Polystyrene-b-Poly(ethylene oxide)
Data(s) |
2009
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Resumo |
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. |
Identificador | |
Idioma(s) |
英语 |
Fonte |
Yang P;Han YC.Crystal Growth Transition from Flat-On to Edge-On Induced by Solvent Evaporation in Ultrathin Films of Polystyrene-b-Poly(ethylene oxide),LANGMUIR ,2009,25(17):9960-9968 |
Palavras-Chave | #ATOMIC-FORCE MICROSCOPY #DIBLOCK COPOLYMER FILMS #THIN-FILMS #POLY(ETHYLENE OXIDE) #IN-SITU #CRYSTALLIZATION KINETICS #POLYMER CRYSTALLIZATION #DENSITY POLYETHYLENE #LAMELLAR ORIENTATION #OXIDIZED SILICON |
Tipo |
期刊论文 |