Effect of substrate surface on dewetting behavior and chain orientation of semicrystalline block copolymer thin films
Article Abstract:
The effects of surface property on the dewetting behavior of block copolymers [E.sub.m][B.sub.n] thin films and chain orientation of the crystalline block were investigated with atomic force microscopy and grazing incidence X-ray diffraction. It was observed that the stems of the E crystals in the first half-polymer layer contacting the mica surface were parallel to the surface, in contrast to the perpendicular chain orientation of the other polymer layers and of the first half-polymer layer on silicon.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2006
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Mechanisms of amine-catalyzed organosilicate hydrolysis at circum-neutral pH
Article Abstract:
The role of amines in catalyzing the hydrolysis process that precedes condensation is analyzed by studying the hydrolysis rates of trimethylethoxysilane (TMES). The results show that amine catalysis of TMES is primarily a consequence of the amine's acidity at neutral pH, the proton released by the amine is transferred to the organosilicate producing a protonated ethoxy leaving group that can be displaced by water in an [S.sub.N]2 reaction.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2006
User Contributions:
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