Fabrication of Robust Superhydrophobic Surface with Roughness Controls by Carbon Nanotubes and Polyisobutylamines
Date Issued
2009
Date
2009
Author(s)
Hsu, Chao-Po
Abstract
We report a facile method for preparation of the robust superhydrophobic film by fabricated carbon nanotubes (CNTs) in the matrix of polyamine-cured epoxy nanocomposite. The requisite polyisobutylene-amines (PIB-amine) were prepared from amidation of PIB-succinic anhydride with polyoxypropylene-triamine at various molar ratios The PIB-amines, consisting of multiple amindoacid functionalities and have chemical structures of linear molecule with one PIB terminal, two PIB terminal and branch with three PIB terminal, serve as an intensive noncovalent bonding force for de-bundling CNTs aggregates into individual tubes. The CNTs dispersion was analyzed by UV-vis absorption and transmission electron microscopy (TEM). The finely dispersed CNTs were consequently self-aligned along with the hydrophobic PIB alkyls into micrometer scale of roughness and showed superhydrophobic and self-cleaning phenomenon. The morphology of the align CNTs surface was observed by scanning electron microscopy (SEM) and the result showed the roughness scale is around 1−4 μm. Furthermore, the CNTs dispersion was introduced into diglycidylether of bisphenol-A. Regarded PIB-triamine as a curing agent, the robust polyamine-epoxy nanocomposite can be generated and demonstrated a superhydrophobic property with the measurement of water contact angle up to 160o. The polyamine-epoxy nanocomposite was self-standing and stable against the immersion in water with a wide range of pH and a mechanical scratching. The convenient manipulation of PIB-amine structure, the PIB-amine/CNTs/epoxy nanocomposite and curing conditions may represent an advance for superhydrophobic coating materials that conventionally required CNTs organic modification or fluorinated alkyl compounds as reported in literature.
Subjects
superhydrophobic surface
film
CNTs
polyisobutylene-amines
Type
thesis
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