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|Title:||Near-u.v. radiation induced surface graft copolymerization of some O3-pretreated conventional polymer films|
|Authors:||Loh, F.C. |
|Citation:||Loh, F.C.,Tan, K.L.,Kang, E.T.,Neoh, K.G.,Pun, M.Y. (1995-05). Near-u.v. radiation induced surface graft copolymerization of some O3-pretreated conventional polymer films. European Polymer Journal 31 (5) : 481-488. ScholarBank@NUS Repository.|
|Abstract:||Pristine and O3-pretreated polymer films of polyethylene terephthalate, low-density polyethylene, high-density polyethylene, polystyrene, polypropylene and polycarbonate have been subjected to near-u.v. radiation induced graft copolymerization with water-soluble monomers such as acrylamide (AAm), acrylic acid (AAc) and sodium salt of 4-styrenesulfonic acid (NaSS). The AAc and NaSS grafted substrates are also coated with polyaniline (emeraldine base) to give rise to self-protonated electroactive surfaces. Using angle-resolved X-ray photoelectron spectroscopy the physical and chemical structures of each copolymerized surface and interface are investigated. The results show that, in each case, O3 pretreatment leads to substantial enhancement of the density of graft and much improved hydrophilicity for the grafted substrates. The increase in graft density also brings about a higher extent of protonation of the coated emeraldine base. The graft polymer is shown to penetrate or partially penetrate the substrate polymer resulting in a thin surface layer which is richer in the substrate polymer. This surface morphology is in agreement with the data obtained using static secondary ion mass spectrometry. © 1995.|
|Source Title:||European Polymer Journal|
|Appears in Collections:||Staff Publications|
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