UV protection by the inclusion of the methoxybenzophenone moieties into the backbone chain of the polyurethane structure

Oprea, Stefan; Potolinca, Violeta Otilia

doi:10.1007/s10965-022-03230-z

Cited by 2 publications

(3 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…But with the content of Chiguard R-455 further increasing, the transmittance and the absorbance of the sample change little in the wavelength range of 200–400 nm. Importantly, unlike other colored or opaque anti-UV PU films reported previously (Figure g and Table S2), ,,− ,,− the anti-UV PU films with better comprehensive performance in this work are colorless and transparent, with a light transmittance of over 88% in the visible wavelength range, which can be used as a UV-shielding material in various fields of human production and life with colorless and transparent requirement. Figure d intuitively verifies the anti-UV capacity of the colorless and transparent film.…”

Section: Resultsmentioning

confidence: 66%

“…(f) Digital photographs of the PU-0.5% film (0.05 g) subjected to lift a load of 5 kg. (g) Comparison of the tensile strength, color, and transparency of the samples reported in this work and those reported in related references. ,,− ,,− …”

Section: Resultsmentioning

confidence: 83%

“…Bio-based molecules such as lignin, curcumin, and quercetin contain UV-absorbing functional groups such as phenols, ketones, conjugated double bonds, and other chromophore groups. , Adding antioxidant molecules extracted from plants to PU can improve the UV resistance and mechanical strength. − However, these biological antioxidant molecules usually have color, which will inevitably lead to colored PU composites, thus limiting their applications. Oprea and Potolinca prepared a series of intrinsic anti-UV polyurethanes using 2,2′-dihydroxy-4-methoxybenzophenone (DHMB, an organic sunscreen compound) as a chain extender. However, the addition of DHMB reduced the mechanical properties of PU, with a maximum tensile strength of 11.5 MPa and a maximum elongation at break of only 680%.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Colorless, Transparent, and High-Performance Polyurethane with Intrinsic Ultraviolet Resistance and Its Anti-UV Mechanism

Huang

Yao

Huang

et al. 2023

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Polyurethane (PU) is a widely used polymer material that will age under prolonged exposure to ultraviolet (UV) light, shortening the service life. Several methods have been used to prepare the anti-UV PU, including adding nonreactive anti-UV additives, functional fillers, and biological antioxidant molecules. However, the nonreactive anti-UV additives may migrate during long-term use, the functional fillers may damage the mechanical properties and seriously reduce the light transmittance of the sample, and the biological antioxidant molecules will inevitably color the sample. To solve these problems, in this work, a benzotriazole UV absorber (Chiguard R-455) was introduced into the PU molecular chains by in situ polymerization to prepare the nonmigrating intrinsic anti-UV PU sample with high performance and colorless transparency. The anti-UV PU samples exhibit light transmittance of over 88% in the visible range and superior mechanical properties with tensile strength higher than 65 MPa and elongation at break higher than 900%. After 24 h UV irradiation (200 W, 365 nm), the tensile strength and elongation at break of pure PU sample are significantly reduced to only 8.9 and 15.8% of the original one, respectively. On the contrary, the addition of Chiguard R-455 will endow the PU sample with excellent anti-UV performance. After 24 h UV irradiation, the tensile strength (67.2 ± 1.6 MPa) and elongation at break (917.4 ± 30.0%) of PU-0.5% (the content of Chiguard R-455 is only 0.5 wt %) have changed little compared with the sample without irradiation (67.4 ± 3.5 MPa and 919.4 ± 26.5%). Additionally, the anti-UV mechanism of the PU sample is systematically studied. This work provides a feasible method for preparing colorless, transparent, high-performance, nonmigrating intrinsic UV-shielding PU samples, which can be used as a UV light-shielding material in various fields with visible and aesthetic requirements, such as protection fields and wearable products.

show abstract