Surface structure of segmented poly(ether urethanes) and poly(ether urethane ureas) with various perfluoro chain extenders. An x-ray photoelectron spectroscopic investigation

Yoon, Sung Chul; Ratner, Buddy D.

doi:10.1021/ma00158a023

Cited by 136 publications

(71 citation statements)

References 16 publications

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“…4. The XPS data were obtained using a Surface Science Laboratories SSX-100 ESCA spectrometer using AlK, radiation.…”

Section: Xpsmentioning

confidence: 99%

“…9 in Ref. 4 (concerning XPS analysis of these materials) can be constructed which plots a SIMS-derived HS/SS ratio at the surface against the bulk HS/SS ratio to reveal effects resulting from: (i) a change in hard segment content for a series of otherwise identical polymers; (ii) variation in soft segment chain length or chain extender molecule; etc. Further discussion of these results would be unnecessarily repetitive.…”

Section: A ( 8 = 0")mentioning

confidence: 99%

“…As might be expected for a mass spectrometric technique, SIMS data from polymers has a very much greater degree of molecular specificitysT6 than XPS and, moreover, it has recently been demonstrated that intensity data can be used to provide semi-quantitative information on polymer surface s t r~c t u r e .~~* Because of these advantages we have applied SIMS to study the same fluorinated polyurethanes described in the XPS study. 4 The previous paper in this series' provides an essential background by discussing SIMS information from conventional polyurethane structures, the polyethers used as 'soft segments' and models for the 'hard segment'. …”

Section: Introductionmentioning

confidence: 99%

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SIMS and XPS studies of polyurethane surfaces 2. Polyurethanes with fluorinated chain extenders

Hearn

Briggs

Yoon

et al. 1987

Surface & Interface Analysis

118

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A series of fluorine-containing segmented poly(ether urethanes) and poly(ether urethane ureas), previously characterized by angular dependent x-ray photoelectron spectroscopy (XPS) have been re-examined using static secondary ion mass spectrometry (SIMS). Comparison of the data from the two techniques has shown that the intensity of secondary ion signals which characterize the hard and soft segments can be used quantitatively for direct analyis of the molecular cymposition at the surface. Moreover, the SIMS sampling depth for the conditions used has been shown to be -10 A, significantly less than the XPS sampling depth under normal conditions, and similar to the XPS sampling depth at high glancing take-off angle (with respect to the surface normal).

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“…4. The XPS data were obtained using a Surface Science Laboratories SSX-100 ESCA spectrometer using AlK, radiation.…”

Section: Xpsmentioning

confidence: 99%

Section: A ( 8 = 0")mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

SIMS and XPS studies of polyurethane surfaces 2. Polyurethanes with fluorinated chain extenders

Hearn

Briggs

Yoon

et al. 1987

Surface & Interface Analysis

118

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“…7a) originated from the LiTFSI electrolyte and the PVDF binder. The C 1s spectra were dominated by two peaks at 284.98 and 286.05 eV, corresponding to the sp 2 hybridized carbon and carbon of C-S nature, accompanied by four weak peaks at 288.69, 290.00, 290.82, and 293.35 eV, which can be ascribed to C]O, C-F, CF 2 CH 2 , and C 10 F 8 bonds respectively [57][58][59] (Fig. 7b).…”

mentioning

confidence: 99%

Facile synthesis of mesoporous graphene platelets with in situ nitrogen and sulfur doping for lithium–sulfur batteries

et al. 2017

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The interaction between lithium polysulfides and doped heteroatoms could prevent the loss of soluble polysulfides in the cathode and mitigate the shuttle effect in lithium-sulfur batteries. Herein, a facile synthesis of mesoporous graphene platelets (NSGs) with in situ nitrogen and sulfur doping by the pyrolysis of a self-assembled L-cysteine precursor on sodium chloride crystal surface for structuredirecting is presented. The mesoporous lamellar structure of the NSG possesses a uniform distribution of pyrrolic N, pyridinic N, and thiosulphate structured heteroatoms originating from in situ doping, which promotes the confinement of intermediate polysulfides. Combining the strong interactions with soluble polysulfide, flexible mesoporous architecture, and high conductivity of graphene, the prepared NSG material exhibited a high initial capacity of 1433 mA h g À1 at a 2C rate as well as a reversible capacity of 684 mA h g À1 after 200 cycles. This demonstrates that the in situ nitrogen and sulfur doped thin lamellar structure of graphene would be a promising cathode material for high performance lithium-sulfur batteries.

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“…The surface properties of a blood-contacting biomaterial are believed to be an important determinant of biocompatibility, so the surface properties of polyurethane biomaterials are of interest. Studies of polyurethane biomaterials in vacuo using XPS techniques have shown that the degree of surface enriched by the soft segment phase is dependent on the degree of phase mixing 8,9) . The degree of phase separation is dependent on such variables as the polarity difference between the pure hard and soft segment components, hard/soft segment ratios, and the polyol molecular weight 3) .…”

Section: Introductionmentioning

confidence: 99%

XPS and ATR surface studies of block copolyurethanes based on 1,2-ethylene bis(4-phenyl isocyanate)

Wang¹,

Huang²

1999

Macromol. Rapid Commun.

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SUMMARY: The surface properties of two block copolyurethanes based on 1,2-ethylene bis(4-phenyl isocyanate) (P2PDI), poly(tetramethylene ether glycol) (PTMG) or poly(propylene glycol) (PPG), and ethylene diamine, were investigated by attenuated total reflectance (ATR) infrared spectroscopy and X-ray photoelectron spectroscopy (XPS) analysis. The air-facing surfaces (AFS) of both materials are more abundant in the PPG or PTMG soft segment. More PTMG present on AFS indicates that the PTMG soft segment is more hydrophobic than PPG. Besides, the ATR spectra revealed that more phase mixing occurs in the near-surface region than in the bulk and the domain/matrix interface tends to orient to this region for both samples.

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Surface structure of segmented poly(ether urethanes) and poly(ether urethane ureas) with various perfluoro chain extenders. An x-ray photoelectron spectroscopic investigation

Cited by 136 publications

References 16 publications

SIMS and XPS studies of polyurethane surfaces 2. Polyurethanes with fluorinated chain extenders

SIMS and XPS studies of polyurethane surfaces 2. Polyurethanes with fluorinated chain extenders

Facile synthesis of mesoporous graphene platelets with in situ nitrogen and sulfur doping for lithium–sulfur batteries

XPS and ATR surface studies of block copolyurethanes based on 1,2-ethylene bis(4-phenyl isocyanate)

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