UV resistance, anticorrosion and high toughness bio-based waterborne polyurethane enabled by a Sorbitan monooleate

Yao

ACS Appl. Mater. Interfaces

et al. 2023

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.

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%

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

Yao

ACS Appl. Mater. Interfaces

et al. 2023

ACS Appl. Polym. Mater.

“…Also, extra glycerol may act as a plasticizer in the system, toughening and deteriorating the strength of samples. The free hydroxyl groups from glycerol are prone to link with carbamates via hydrogen bonds, which remedied the deterioration from extra glycerol and further ensured the PUV1.1 with excellent ductility. , However, too much glycerol will reduce the order of polymer chain conformation, leading to PUV1.2 with the dissatisfactory strain . Meanwhile, the enhanced hydrogen bond interaction between carbamate with a free hydroxyl group will increase the order of polymer chain conformation and improve the peak temperature of tan δ of PUV1.1.…”

Section: Resultsmentioning

confidence: 99%

Biobased Aliphatic Polyurethane Vitrimer with Superior Mechanical Performance and Fluorescence-Based Defect Diagnostic Function

Zhou

Chang

Liu

et al. 2023

Thermosetting polyurethanes generally have robust mechanical properties, good chemical resistance, and biocompatibility. However, they suffer difficulties in repairing or recycling once they served their initial purpose as a result of their cross-linked structure. Hence, we report an unconventional catalyst-free polyurethane vitrimer (PUV) prepared from a bio-based feedstock. The obtained compounds have abundant carbamate linkages, and the dense hydrogen bonds between carbamates and hydroxyl groups contribute to the impressive tensile strength and impact energy absorption values of 76.8 MPa and 60.4 kJ/m2, respectively. In addition, rich carbamate bonds and free hydroxyl groups present in the network enable a thermally induced intrinsic dynamic carbamate interchange reaction (referred to as transcarbamoylation) (DCIR) without the need of the catalyst. With the highly efficient DCIR, the damaged PUV film can be repaired fully at 160 °C in 10 min, and its fragments can be recycled into an integral film via hot pressing at 180 °C in 2 h. Also, the application of PUV is demonstrated with a fluorescent indicator film, the damages and defects on the surface of which are easily detectable and repairable. Overall, this work proposes a simple strategy for preparing a catalyst-free high-performance PUV from bio-based alcohols and demonstrates its potential use in high-performance film applications.

“…Waterborne polyurethane (WPU) has attracted increasing attention for applications in the fields of textiles, 1 leather, 2 biomedicine, 3,4 foodstuff packaging 5 and electronics 6,7 owing to its environment friendliness, good biocompatibility and easy modification. 8,9 However, pure WPU has no antibacterial properties, and its segments contain carbon sources required for the growth of microorganisms. 10 This is easily disturbed by bacteria and microorganisms, especially in highly antibacterial industries, such as medicine.…”

Section: Introductionmentioning

confidence: 99%

Preparation and antibacterial study of waterborne polyurethane modified with lysine and quaternary ammonium salt

Wang²,

Shi

et al. 2023

New J. Chem.