2006
DOI: 10.1002/sia.2380
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Onset of surface segregation controlled by the segment length of the low-energy component of polymers

Abstract: Films of a series of polymers with variable CF 2 segments were studied by angle-dependent X-ray photoelectron spectroscopy (ADXPS) and time-of-flight secondary ion mass spectroscopy (ToF-SIMS). The effects of the length of the CF 2 segment on the surface composition of the polymers were investigated. ADXPS results indicated that the CF 2 segment segregated on the surface of the polymers after thermal annealing at temperatures above their bulk glass transition temperatures when the number of CF 2 units was incr… Show more

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Cited by 4 publications
(4 citation statements)
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“…The intrinsic scientific interest as well as the industrial applications of segregation phenomena at the surface and interfaces in polymer blends have prompted extensive experimental and theoretical explorations. Generally, in a miscible blend of two polymers with equivalent degrees of polymerization, a so-called symmetric blend, the lower surface energy component is enriched at the surface to minimize the total free energy of the system. In addition, the molecular weight disparity between the components is also a factor in determining the surface composition of polymer blends. ,, Such behavior has been observed in a polystyrene (hPS) with a bimodal molecular weight distribution.…”
Section: Introductionmentioning
confidence: 99%
“…The intrinsic scientific interest as well as the industrial applications of segregation phenomena at the surface and interfaces in polymer blends have prompted extensive experimental and theoretical explorations. Generally, in a miscible blend of two polymers with equivalent degrees of polymerization, a so-called symmetric blend, the lower surface energy component is enriched at the surface to minimize the total free energy of the system. In addition, the molecular weight disparity between the components is also a factor in determining the surface composition of polymer blends. ,, Such behavior has been observed in a polystyrene (hPS) with a bimodal molecular weight distribution.…”
Section: Introductionmentioning
confidence: 99%
“…In our previous study,34 the backbones of polyethersulfone were similarly incorporated with short fluorocarbon segments of variable lengths. The degree of surface segregation of the fluorocarbon segment was substantially increased when the number of the CF 2 units of the fluorocarbon segment increased from four to eight.…”
Section: Discussionmentioning
confidence: 99%
“…Composition and structure of the surface of polymers with fluorinated components are often different from the bulk . The fluorinated components tend to migrate to the surface of amorphous polymers due to their low surface energies, with the one exception that they can migrate to the bulk when they are incorporated in a crystallizable backbone .…”
Section: Introductionmentioning
confidence: 99%
“…Composition and structure of the surface of polymers with fluorinated components are often different from the bulk . The fluorinated components tend to migrate to the surface of amorphous polymers due to their low surface energies, with the one exception that they can migrate to the bulk when they are incorporated in a crystallizable backbone . Applications of time‐of‐flight secondary ion mass spectrometry (ToF‐SIMS) to surface studies of amorphous, semi‐crystalline and liquid crystal polymers are well documented .…”
Section: Introductionmentioning
confidence: 99%