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|Title:||Surface hardness of pristine and modified polyaniline films|
|Authors:||Kang, E.T. |
|Source:||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|
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