Electron spectroscopy of polymers

Pireaux, J. J.; Riga, J.; Boulanger, Pierre; Snauwaert, P.; Novis, Y.; Chtaïb, M.; Grégoire, Chantal; Fally, F.; Beelen, Eric S. E. van; Caudano, R.; Verbist, J.

doi:10.1016/0368-2048(90)85038-b

Cited by 34 publications

(12 citation statements)

References 23 publications

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“…On the other hand, literature reports assign a BE of 401.4 eV to a quaternary nitrogen group33 or to a tertiary amine moiety. 34 experiments,35 but this species should be very unstable, so that we suggest that 401.4-eV band is due to tertiary nitrogen groups, probably enclosed in condensed cycles. The absolute quantitative trends for thermally-treated samples are reported in Figure 4a in terms of the initial total nitrogen content.…”

Section: Resultsmentioning

confidence: 74%

Particle beam-induced reactions versus thermal degradation in PMDA-ODA polyimide

Marletta¹,

Iacona²,

Tóth³

1992

Macromolecules

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Chemical reactions induced by heat and particle bombardment at low energy in PMDA-ODA have been studied by XPS and REELS. Different chemical reactions involving the chemical state of oxygen and nitrogen are shown to occur with different products and rates depending on the peculiar way of energy deposition. In particular, thermal treatments proceed mainly by decarbonylation of imidic rings, leaving the ether linkage in the PMDA-ODA unit essentially unaffected. Evidence is found that thermal treatment results in the formation of large condensed aromatic systems, possible precursors for true graphitization at higher temperature. Also, a characteristic REELS signature is observed, diagnostic of the formation of a hydrogenated amorphous carbon phase. In the case of particle bombardment, the destruction of imide and phenyl rings occurs through a random fragmentation mechanism, leaving a detectable concentration of the imidic moiety at the steady state. A specific reaction channel has been identified, involving the production of recoiling oxygen atoms, which react with the carbon backbone to form new additional ether or hydroxyl groups. Also the electronic structure of the irradiated samples is shown to be different from that of the pyrolyzed samples. In particular, no evidence is found for the formation of large delocalized aromatic systems observed in the thermal case, while the predominant effect is the formation of highly disordered a-C:H phases.

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Section: Resultsmentioning

confidence: 74%

Particle beam-induced reactions versus thermal degradation in PMDA-ODA polyimide

Marletta¹,

Iacona²,

Tóth³

1992

Macromolecules

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“…11 However, many of the ingredients in elastomer formulations are based on simple hydrocarbons, and do not contain heteroatoms or functional groups that can be readily examined using core-level XPS spectra. Thus, the application of core-level XPS spectra to elastomer surface analysis is limited.…”

Section: Introductionmentioning

confidence: 99%

Surface chemistry of bromobutyl binary blends

Galuska

1999

Surf. Interface Anal.

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“…Or does the bulk conformation extend to the surface? Charged particle based spectroscopies are unbeatable for their surface sensitivity: ISS, 2 ͑TOF͒-SIMS, 3 XPS, 4 and HREELS 5 have already been used to measure structure and orientation of functional groups at the topmost surface of polymers. HREELS ͑high resolution electron energy loss spectros-copy͒, a surface sensitive method resembling the physical basis of ir spectroscopy, might be able to provide the answer.…”

Section: Introductionmentioning

confidence: 99%

A comparative study of chain conformation at the surface of poly(β-benzyl-L-aspartate) and poly(γ-benzyl-L-glutamate) films with high resolution electron energy loss spectroscopy

Leclerc

Pireaux

Caudano

et al. 1995

The Journal of Chemical Physics

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Articles you may be interested inStructure of poly(γ-benzyl-L-glutamate) monolayers at the gas-water interface: A Brewster angle microscopy and x-ray scattering study J. Chem. Phys. 111, 9761 (1999); 10.1063/1.480312 Electrooptical investigation of the effect of space charge on molecular alignment in polyγbenzylLglutamate solutions J. Chem. Phys. 66, 1343 (1977); 10.1063/1.434029Temperature, concentration, and molecular weight dependence of the twist elastic constant of cholesteric polyγ benzylLglutamate High resolution electron energy loss spectroscopy ͑HREELS͒ is used to study spin-coated films of two polyaminoacids, poly͑␤-benzyl-L-aspartate͒ ͑PBA͒ and poly͑␥-benzyl-L-glutamate͒ ͑PBG͒. The experimental results show that the side chains of these two polymers take a very different conformation at the surface: This is confirmed by infrared spectroscopy ͑ir͒ and differential scanning calorimetry ͑DSC͒ which are more bulk sensitive techniques. This effect is further attributed by computer graphics facilities ͑BIOSYM͒ to a larger flexibility of the side chain of PBG as compared to PBA.

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Electron spectroscopy of polymers

Cited by 34 publications

References 23 publications

Particle beam-induced reactions versus thermal degradation in PMDA-ODA polyimide

Particle beam-induced reactions versus thermal degradation in PMDA-ODA polyimide

Surface chemistry of bromobutyl binary blends

A comparative study of chain conformation at the surface of poly(β-benzyl-L-aspartate) and poly(γ-benzyl-L-glutamate) films with high resolution electron energy loss spectroscopy

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