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

Abstract

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.

Facile Generation of Polymer–Alloy Hybrid Layers for Dendrite‐Free Lithium‐Metal Anodes with Improved Moisture Stability

“…Notably, the FTIR results demonstrate that the content of PTMEG is significantly lower without the addition of PO (see Figure S5). The high‐resolution X‐ray photoelectron spectroscopy (XPS) C 1s spectrum (Figure e) can be divided into two peaks at 286.36 and 284.97 eV, representing C−O and ‐CH 2 ‐, respectively . Moreover, the PTMEG hybrid layer was further investigated by 1 H NMR spectroscopy and gel‐permeation chromatography (GPC).…”