Please use this identifier to cite or link to this item:
|Title:||Surface hardness of pristine and modified polyaniline films|
|Authors:||Kang, E.T. |
|Citation:||Kang, E.T., Ma, Z.H., Tan, K.L., Tretinnikov, O.N., Uyama, Y., Ikada, Y. (1999-08-03). Surface hardness of pristine and modified polyaniline films. Langmuir 15 (16) : 5389-5395. ScholarBank@NUS Repository. https://doi.org/10.1021/la981717r|
|Abstract:||The surface microhardness of conventional thermoplastics lie between 0.1 and 0.6 GPa. The as-cast emeraldine (EM-25) base film of polyaniline (PANi) exhibits a surface microhardness of about 1 GPa. The hardness is increased to about 4 GPa in the highly cross-linked EM (EM-150) film. This hardness value is further enhanced to about 6 GPa after 1 cycle of acid-base treatment. The hardness of the EM-150 film can also be enhanced to about 8 GPa through protonation or through reduction to the leucoemeraldine state. Surface modification of the EM-150 films via graft copolymerization with acrylic acid or styrenesulfonic acid readily gives rise to hard-surfaced PANi films having microhardness values approaching 20 GPa. This surface hardness is comparable to many of those reported for the very hard-surfaced conventional polymers from high-energy ion-beam bombardments. The surface hardness of the surface-modified EM-150 film arises from the additional covalent bonding of the graft chains on the highly cross-linked EM-150 film surface and the charge-transfer interaction between the graft and the substrate chains.|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Jul 14, 2018
WEB OF SCIENCETM
checked on Jul 4, 2018
checked on Jun 1, 2018
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.