Journal
ACS MACRO LETTERS
Volume 4, Issue 2, Pages 151-154Publisher
AMER CHEMICAL SOC
DOI: 10.1021/mz500725s
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- American Chemical Society Petroleum Research Foundation [51049-DNI7]
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The effect of surface chemistry on the glass transition of polycarbonate (PC) inside cylindrical nanopores is studied. Polycarbonate is melt-wetted into nanoporous anodic aluminum oxide (AAO) treated with hydrophobic alkyl- and fluorosilanes of varying length. The curvature observed at the nanowire tips is consistent with a contact angle descriptive of polycarbonate AAO surface interactions. Differential scanning calorimetry (DSC) thermograrns reveal a distinct broadening of the T-g that is related to the motion of polymer chains at the nanopore wall as well as at the core. DSC and thermal gravimetric analysis (TGA) show that polycarbonate infiltrated into a naked AAO template (without silane treatment) degrades upon heating, suggestive of a surface-catalyzed degradation mechanism. It is further shown that silane treatment largely prevents PC thermal degradation.
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