کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5182279 1380985 2012 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Adsorption of PNIPAm110-PEO100-PPO65-PEO100-PNIPAm110 pentablock terpolymer on hydrophobic gold
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Adsorption of PNIPAm110-PEO100-PPO65-PEO100-PNIPAm110 pentablock terpolymer on hydrophobic gold
چکیده انگلیسی

The adsorptions of a double thermo-sensitive pentablock terpolymer, PNIPAm110-PEO100-PPO65-PEO100-PNIPAm110 (PNIPAm110-F127-PNIPAm110), on hydrophobic gold surfaces at various temperatures were investigated by using quartz crystal microbalance (QCM), atomic force microscopy (AFM), and ellipsometry. The experimental results indicated that the adsorption kinetics, adsorbed amounts and morphologies of the adsorbed terpolymer layers were strongly dependent on the temperatures, which could be correlated with the chain conformation of PNIPAm110-F127-PNIPAm110 in aqueous solution. At the low critical solution temperature (LCST) of PPO block (i.e. 31 °C), PNIPAm110-F127-PNIPAm110 was adsorbed onto hydrophobic gold surface via a two-step adsorption process and adopted a brush-like conformation. While at the LCST of PNIPAm block (i.e. 34 °C), a complex multistep adsorption process was observed, which resulted in a large adsorption amount. By comparing with the adsorption behavior of F127 at the corresponding temperature, it was deduced that the large adsorption amount obtained at 34 °C was mainly attributed to the presence of PNIPAm blocks. The premicellar associative adsorption was thought to play an important role for the observation of this unexpected adsorption behavior at 34 °C, leading to the large adsorption amount and large aggregate structures as revealed by AFM.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 53, Issue 17, 2 August 2012, Pages 3791-3801
نویسندگان
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