塊狀聚合物薄膜在中性溶劑下的結構研究

倪伊娃

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塊狀聚合物薄膜在中性溶劑下的結構研究

Study on Morphological Development of Diblock Copolymer Thin Film under Neutral Solvent Annealing

倪伊娃 , Masters　　Advisor：羅介聰　　

英文

非均相成核；去溼；薄膜；回火； diblock copolymer ； annealing ； heterogeneous nucleation ； spinodal dewetting ； dewetting ； thin film

Abstract │ Reference (193) │ Altmetrics

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ABSTRACT

The importance of diblock copolymer thin film on the application in nanotechnology has promoted extensive studies in obtaining long-range alignment of microstructures. In this study, we focus on the understanding of morphological evolution of symmetric polystyrene-b-poly(2-vinyl pyridine) (PS-PVP) thin film annealed in a neutral solvent. Atomic force microscopy (AFM) was employed to investigate the nanostructure of PS-PVP thin film as a function of the nature of the solvent, the quantity of the solvent, and annealing time. It was obtained that the development of morphology of thin film under different kinds of neutral solvents qualitatively agrees well, but the rate of structure change is different due to the different vapor pressure of these solvents. The solvent with lower vapor pressure takes longer time and more quantity of solvent to reach an ordered structure.

Dewetting is another fundamental problem that has to be resolved in obtaining long range order of block copolymer thin film with the least defect. The dewetting mechanism was verified by optical microscopy, and the dewetting mechanism is correlated to the swelling coefficient (Q), which represents the quantity of the solvent that swells the thin film under solvent vapor treatment. At low Q, dewetting evolves via heterogeneous nucleation. At high Q, spinodal dewetting dominates the dewetting mechanism. The behavior of Q with respect to the dewetting mechanism is consistent regardless of the nature of neutral solvents.

Keywords : thin film; annealing; diblock copolymer; dewetting; heterogeneous nucleation; spinodal dewetting

Reference ( 193 ) 〈TOP〉

CHAPTER 1 INTRODUCTION
連結：
1. Li X, Peng J, Wen Y, Kim DH, Knoll W. Morphology Change of Asymmetric Diblock Copolymer Micellar Films during Solvent Annealing Polymer 2007: 48:2434-2244.
連結：
2. Hamley IW. The Physics of Block Copolymers. New York: Oxford University Press, 1998.
連結：
3. Fasolka M, Mayes A. BLOCK COPOLYMER THIN FILMS: Physics and Applications 1. Annual Review of Materials Research 2001:31(1):323-355.
連結：
4. Lin Z, Kim DH, Wu X, Boosahda L, Stone D, LaRose L, Russell TP. A Rapid Route to Arrays of Nanostructures in Thin Films. Adv Mater 2002:14(19):1373-1376.
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