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Volumn 17, Issue 21, 2005, Pages 2591-2595

Crosslinked poly (styrene)-block-poly (2-vinylpyridine) thin films as swellable templates for mesostructured silica and titania

Author keywords

[No Author keywords available]

Indexed keywords

BLOCK COPOLYMERS; CROSSLINKING; MICROCRACKING; SILICA; THIN FILMS; TITANIUM DIOXIDE;

EID: 27744605279     PISSN: 09359648     EISSN: None     Source Type: Journal    
DOI: 10.1002/adma.200500334     Document Type: Article
Times cited : (73)

References (43)
  • 18
    • 27744558902 scopus 로고    scopus 로고
    • note
    • Adjacent cylinders in Figure 2 are spaced by 35-40 nm, which is considerably expanded from the value of 24 nm for the melt state, as seen in Figure 3b. The osmotic stresses generated during swelling of the thin polymer film were apparently alleviated by large-scale rear-rangement of the initial 2D hexagonal mesostructure to allow cylinders to adopt an expanded nearest-neighbor spacing in-plane as well as out-of-plane.
  • 21
    • 27744595484 scopus 로고    scopus 로고
    • note
    • The iodine signal oscillates slightly due to the incorporation of DIB into the P2VP component of the polymer.
  • 22
    • 27744607529 scopus 로고    scopus 로고
    • note
    • Virtually identical structures were observed for the block-copolymer film before and after P2VP crosslinking, indicating that the morphology is not significantly altered by the crosslinking procedure.
  • 23
    • 27744517752 scopus 로고    scopus 로고
    • note
    • Details of the interaction between P2VP and silica are not yet wellunderstood. The mechanism is thought to involve enhanced condensation of silica in the presence of the block-copolymer template, and/ or favorable interactions (i.e., hydrogen bonding) between P2VP moieties and the silica oligomers. There have been previous reports of silica templating by poly(vinylpyridine) under acidic conditions [24-26], and poly(2-vinylpyridine) is known to adsorb strongly on silica surfaces under highly acidic conditions [27].
  • 28
    • 27744552918 scopus 로고    scopus 로고
    • note
    • The silicon signal lags the deuterium signal by slightly more than half the period of the oscillation, presumably due to the slower etching of silica relative to polystyrene by the oxygen-ion beam of the SIMS instrument.
  • 39
    • 27744443680 scopus 로고    scopus 로고
    • note
    • The particles were not deposited by sedimentation (films were immersed in the precursor solution in a vertical orientation) but apparently nucleated on the film surface. This most likely occurred due to the proximity of the processing conditions (pH and concentration) to the stability limits for the titania precursor, beyond which macroscopic precipitation of titania was observed [40].


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.