کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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5182936 | 1381004 | 2011 | 9 صفحه PDF | دانلود رایگان |
Thin films of polydopamine, a melanin-like material formed by the oxidative polymerization of dopamine in aqueous solution, have attracted much recent interest as functional coatings. Here we demonstrate the use of modified polydopamine as an initiator layer for surface-initiated polymerization, synthesized by reacting dopamine with 2-bromoisobutyryl bromide (BIBB) before deposition. Modified polydopamine films grew at a comparable rate to unmodified polydopamine, with a 45Â nm being grown in 24Â h. The presence of initiator groups was confirmed by XPS and FTIR and by the growth of PMMA and PHEMA polymer brushes. ARGET, the recently-developed oxygen-tolerant variant of ATRP, was used for surface polymerization with sodium ascorbate as the reducing agent. Polymerization was rapid, with PMMA brushes of nearly 240Â nm thickness being grown in 24Â h. A range of substrates could be coated in this way, including metals and hydrophobic polystyrene, demonstrating the broad applicability of this initiator.
Journal: Polymer - Volume 52, Issue 10, 4 May 2011, Pages 2141-2149