In Situ ATR-FTIR Investigation of Photodegradation of 3,4-Dihydroxybenzoic Acid on TiO2

Hu, Xuefeng; Bürgi, Thomas

doi:10.1007/s10562-016-1838-y

Cited by 8 publications

(1 citation statement)

References 25 publications

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“…In this sense, the bands located at 1357 and 1526 cm −1 correspond to the ring stretching vibrations (υ c-c aromatic ring) [ 26 ]; even the 1357 cm −1 band could have significant contributions from the amide III band. The Ph-OH bending mode was detected at 1282 cm −1 , where it had also been detected in pristine protocatechuic acid [ 27 ]. Finally, the bands located at 1052 and 1028 cm −1 were associated with the C-O tension modes of primary alcohols [ 28 ].…”

Section: Resultsmentioning

confidence: 99%

Design and Synthesis of Bio-Inspired Polyurethane Films with High Performance

et al. 2020

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In the present work, the synthesis of segmented polyurethanes functionalized with catechol moieties within the hard or the soft segment is presented. For this purpose, a synthetic route of a new catechol diol was designed. The direct insertion of this catechol-free derivative into the rigid phase led to segmented polyurethanes with low performance (σmax ≈ 4.5 MPa). Nevertheless, when the derivative was formally located within the soft segment, the mechanical properties of the corresponding functionalized polyurethane improved considerably (σmax ≈ 16.3 MPa), owing to a significant increase in the degree of polymerization. It is proposed that this difference in reactivity could probably be attributed to a hampering effect of this catecholic ring during the polyaddition reaction. To corroborate this hypothesis, a protection of the aromatic ring was carried out, blocking the hampering effect and avoiding secondary reactions. The polyurethane bearing the protected catechol showed the highest molecular weight and the highest stress at break described to date (σmax ≈ 66.1 MPa) for these kind of catechol-functionalized polyurethanes. Therefore, this new approach allows for the obtention of high-performance polyurethane films and can be applied in different sectors, benefiting from the molecular adhesion introduced by the catechol ring.

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Section: Resultsmentioning

confidence: 99%