OBSERVATION OF CONFORMATION OF ADSORBED GRAFTED COPOLYMER ON α-Al<sub>2</sub>O<sub>3</sub> WITH ATOMIC FORCE MICROSCOPY

DOI Web Site 9 References
  • TANAKA Tatsuki
    HOKKAIDO UNIVERSITY, Graduate School of Engineering（Kita 13, Nishi 8, Kita-ku, Sapporo-shi, Hokkaido 060-8628）
  • ANDO Masanobu
    HOKKAIDO UNIVERSITY, Graduate School of Engineering（Kita 13, Nishi 8, Kita-ku, Sapporo-shi, Hokkaido 060-8628）
  • KUZUMA Yuki
    HOKKAIDO UNIVERSITY, School of Engineering（Kita 13, Nishi 8, Kita-ku, Sapporo-shi, Hokkaido 060-8628）
  • NAWA Toyoharu
    HOKKAIDO UNIVERSITY, Faculty of Engineering（Kita 13, Nishi 8, Kita-ku, Sapporo-shi, Hokkaido 060-8628）

Bibliographic Information

Other Title
  • 原子間力顕微鏡を用いたα-Al<sub>2</sub>O<sub>3</sub>表面に吸着したグラフトポリマーの形態観察

Abstract

<p>In this paper, we observed the morphology of polycarboxylate copolymer（PC）grafted with polyethylene glycol（PEG）, which was absorbed on the surface of α-Al2O3 substrate by an Atomic Force Microscopy（AFM）. PC has individually adsorbed on α-Al2O3 surface because of much lower concentration of PC in solution. In the case of PC with short graft PEG chain, the thickness of adsorbed PC layer is larger than the length of PEG. This leads to the conclusions that adsorbed PC has loop on α-Al2O3 surface. In contrast, for PC with long PEG chain, the thickness of adsorption layer is smaller than the PEG chain length, suggested that PC adsorbed in train configuration on α-Al2O3 surface.<br/>Interaction force was evaluated by force curve mode measurement of AFM. From the results of the force curve measurement, hydration force has observed at 4nm far from the α-Al2O3 surface in absence of PC, while in the presence of PC, steric repulsion has observed from far than 4nm where the hydration force has observed. The experimental data were compared to the theoretically predicted force values by combined profile model of PC adsorbed on substrate surface with the steric repulsion model, both of which were proposed by de Gennes. The parameters were determined taking into account the change of adsorption layer thickness with the pressing of the AFM probe. The comparisons showed that there existed the good correlations between them. The results also indicated that the length of segment of PGE polymer, the minimum unit of the polymer that can be flexibly movable, was around 2.1-2.2nm despite of the length of graft PEG chain. This implies that for the PC with short graft chain, PEG chain behaved like the rigid rod as the chain length of graft polymer, 2.5nm, is almost equal to the segment length. It can be explain the steeper rise of steric force for PC with short PEG chain is larger than that of PC with longer PEG chain.</p>

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