Effect of chain extenders with different functionalities on the properties of single-component waterborne polyurethane ink binders

Yang, Zhihui; Cui, Xiang

doi:10.1039/d2ra02707k

Cited by 7 publications

(1 citation statement)

References 42 publications

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“…A contact angle measuring instrument was used, and the surface free energy was calculated using the Owens-Wendt method with Formulas (2) and (3). The polar component and dispersion component of distilled water are 51.0 mJ/m 2 and 21.8 mJ/m 2 [15], respectively, and the polar component and dispersion component of ethylene glycol are 19.0 mJ/m 2 and 29.3 mJ/m 2 [16], respectively.…”

Section: Surface Free Energy Analysismentioning

confidence: 98%

Study on the Characterization of Physical, Mechanical, and Mildew Resistance Properties of Enzymatically Treated Bamboo Fiber-Reinforced Polypropylene Composites

Meng,

Hu,

Liu

et al. 2023

Forests

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The enhancement of the physical and mechanical properties and the anti-mildew performance of wood–plastic composites are of great significance for broadening their application field. In this research, bamboo fibers underwent treatments with safe, environmentally friendly bio-enzymes. Subsequently, a bamboo–plastic composite (BPC) was developed using the modified bamboo fibers and polyethylene. The effects of biological enzymatic treatments on the surface free energy, the chemical composition of the bamboo fibers, water resistance, thermal stability, bending performance, impact performance, and anti-mildew performance of the BPC samples were analyzed. This study revealed that treating bamboo powder with bio-enzymes (xylanase, lipase, laccase, pectinase, hemicellulase, or amylase) decreased the surface free energy and the polar components of the bamboo fibers while improving the surface O/C atomic ratio of the bamboo fibers. These enzyme treatments enhanced the water resistance, bending performance, and anti-mildew performance of the BPC samples. However, on the whole, the thermal stability of the composites decreased. Particularly, after hemicellulase treatment, the composites had the lowest water absorption, reflecting a decrease of 68.25% compared to the control group. With xylanase modification, the 24 h water absorption thickness swelling rate of the composites was the lowest, reflecting a decrease of 71.27% compared to the control group. After pectinase modification, the static bending strength and elastic modulus of the prepared composites were the highest, with an increase of 15.45% and 13.31%, respectively, compared to the unmodified group. After xylanase modification, the composites exhibited the best anti-mildew effect, with an anti-mold effectiveness of 74.67%. In conclusion, bio-enzyme treatments can enhance the physical and mechanical properties and anti-mildew performance of BPCs. This research provides a theoretical foundation for the preparation of high-performance wood–plastic composites.

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Section: Surface Free Energy Analysismentioning

confidence: 98%

Study on the Characterization of Physical, Mechanical, and Mildew Resistance Properties of Enzymatically Treated Bamboo Fiber-Reinforced Polypropylene Composites

Meng,

Hu,

Liu

et al. 2023

Forests

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Improving the performance of biobased polyurethane dispersion by the incorporation of photo-crosslinkable coumarin

et al. 2023

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High biobased carbon content polyurethane dispersions (PUD) are a more sustainable alternative to conventional oil-derived waterborne dispersions in coatings. However, there are still many performance limitations from restricted availability of effective renewable monomers and oligomers. This work demonstrates the improvement of the properties of high biobased content PUD and derived coating by introducing a photo-reversibly crosslinkable coumarin as chain extender within the structure. The effect of partial substitution of 1,3-propanediol biobased by a di-hydroxy photo-reactive cyclic coumarin on the particle size and the stability was analyzed by dynamic light scattering (DLS) and multiple light scattering (MLS). The lateral and more rigid structure of coumarin involved a moderated increment in particle size without significant effect on the dispersion stability for at least 45 days. Associated improvement in hardness and toughness was also demonstrated by tensile test, pendulum hardness, pencil hardness and scratch resistance test. Furthermore, controlled UV irradiation of the polyurethane gave rise to a mechanical performance adjustment from reversible photo-crosslinking and scission of the coumarin molecules within the macromolecular structure. A 70% dimerization degree of the coumarin within the polyurethane film by UV light provided a partially reversible threefold higher tensile strength than that of the original biobased formulation as an effective tool to tune the response of biobased polyurethanes. Graphical Abstract

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Synthesis of polyurethane with asymmetric hard segments and its effect on room-temperature self-healing property of bitumen

Zhou,

Xia,

et al. 2024

Construction and Building Materials

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Effect of chain extenders with different functionalities on the properties of single-component waterborne polyurethane ink binders

Abstract: Waterborne polyurethane (WPU) dispersions were prepared by post-chain extension and crosslinking reactions using different functional chain extenders. The influences of chain extenders type on the properties of WPUs were investigated.

Cited by 7 publications

References 42 publications

Study on the Characterization of Physical, Mechanical, and Mildew Resistance Properties of Enzymatically Treated Bamboo Fiber-Reinforced Polypropylene Composites

Study on the Characterization of Physical, Mechanical, and Mildew Resistance Properties of Enzymatically Treated Bamboo Fiber-Reinforced Polypropylene Composites

Improving the performance of biobased polyurethane dispersion by the incorporation of photo-crosslinkable coumarin

Synthesis of polyurethane with asymmetric hard segments and its effect on room-temperature self-healing property of bitumen

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