Direct imaging of surface and bulk structures in solvent cast polymer blend films

Langmuir

Volumn 13, Issue 9, 1997, Pages 2483-2488

  Kumacheva, Eugenia ^a   Li, Lin ^a   Winnik, Mitchell A ^a   Shinozaki, Doug M ^b   Cheng, P C ^c  

^a UNIVERSITY OF TORONTO   (Canada)

^b UNIVERSITY OF WESTERN ONTARIO   (Canada)

^c UNIVERSITY AT BUFFALO   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0001705843     PISSN: 07437463     EISSN: None     Source Type: Journal    
DOI: 10.1021/la961089i     Document Type: Article

References (41)

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27. 2(2 + cos θ). When θ varies from 0° (complete wetting) to 180° (nonwetting conditions), f(θ) increases from 0 to 1. This implies that in good wetting conditions, heterogeneous nucleation of the new phase starts at a lower solution supersaturation than needed for the homogeneous nucleation. In our experiments, the wetting angle of PMMA-rich phase measured at the air-film interface changes in a range 88-92° which provides f(θ) = 0.47-0.52 (in liquid films, this value should be even lower), so the nucleation of the PMMA-rich phase at the air-film interface occurs earlier than in the bulk.
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