NEAR-UV RADIATION-INDUCED SURFACE GRAFT-COPOLYMERIZATION OF SOME O-3-PRETREATED CONVENTIONAL POLYMER-FILMS

被引:19
作者
LOH, FC [1 ]
TAN, KL [1 ]
KANG, ET [1 ]
NEOH, KG [1 ]
PUN, MY [1 ]
机构
[1] NATL UNIV SINGAPORE,DEPT CHEM ENGN,SINGAPORE 0511,SINGAPORE
关键词
D O I
10.1016/0014-3057(94)00203-7
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Pristine and O-3-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, O-3 pretreatment leads to substantial enhancement of the density of graft and much improved hydrophilic ity 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.
引用
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页码:481 / 488
页数:8
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