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Chemicals, plastics and rubber industries

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Perfluoro-poly(ethers) with hydroxyl end groups: analysis by TOF-SIMS

Article Abstract:

Perfluoro-poly(ethers)(PFPEs) have extensive industrial and commercial applications. Time-of-flight, secondary ion-mass spectrometric studies were conducted to examine the ionic spectra of PFPE with hydroxyl end groups. They are commercially known as Fomblin Z, Krytox-OH and Demnum-SA. An anomaly was identified in the negative-ion spectrum due to the absence of some fragments of the hydroxyl end groups. The findings suggest that the charge-transfer between the electron donating PFPE-OH and electron-accepting dangling bonds influenced the bonding of PFPE-OH to COC.

Research, Spectra, Ions, Charge transfer, Surface chemistry, Ethers, Ethers (Class of compounds), Secondary ion mass spectrometry

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Laser ablation of polyethersulfone films: the decomposition of the chain structure and the expansion of neutral species studied by laser ionization mass spectrometry

Article Abstract:

Ablation of polyethersulfone (PES) films at 266 nm has been studied by using laser ionization time-of-flight (TOF) mass spectrometry. PES is made up of two phenylene groups, a sulfone group and an ether oxygen with carbon-carbon bonds within the phenylene rings. Neutral products arriving at an ion extraction position of a TOF mass spectrometer were detected by delaying a post-ionization laser pulse. Results indicate that the decomposition of PES occurs due to the scission of the chain itself and the cleavage of some of the phenylene rings.

Analysis, Thin films, Laser beam cutting, Laser cutting, Polyethersulphones, Polyethersulfone

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Pulsed laser ablation of Sn and SnO2 targets: Neutral composition, energetics, and wavelength dependence

Article Abstract:

Neutral gas-phase species were examined using time-of-flight mass spectrometric experiments.

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