Journal
POLYMERS
Volume 14, Issue 11, Pages -Publisher
MDPI
DOI: 10.3390/polym14112197
Keywords
cellulose nanocrystals; polyurethane; tannic acid; Ag NPs; antibacterial activity
Categories
Funding
- National Natural Science Foundation of China [52103156]
- Chongqing Science and Technology Commission Project [cstc2021jcyjmsxmX0663, cstc2021jcyj-msxmX0559]
- Chongqing Bayu Scholars Young Scholars Project [YS2021089]
- Chongqing Talents [CQYC20210302379]
- Youth Fund project of the Chongqing University of Science and Technology [ckrc2019015]
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Researchers have synthesized a series of cellulose nanocrystal-based polyurethane materials. By covalently binding tannic acid and introducing silver nanoparticles through a reduction reaction, the antibacterial properties of the materials were significantly enhanced.
As a new type of polymer, water-driven polyurethane (PU) has attracted increasing attention of researchers; however, with the popularization of its application, the following infection problems limit their applications, especially in the biomedical field. Herein, a series of novel cellulose nanocrystals (CNCs)-based PUs were first synthesized by chemical cross-linking CNCs with triblock copolymer polylactide-poly (ethylene glycol)-polylactide (CNC-PU). After covalent binding with tannic acid (TA-CNC-PU), the silver nanoparticles (Ag NPs) were further introduced into the material by a reduction reaction (Ag/TA-CNC-PU). Finally, the prepared serial CNCs-based PU nanocomposites were fully characterized, including the microstructure, water contact angle, water uptake, thermal properties as well as antibacterial activity. Compared with CNC-PU, the obtained TA-CNC-PU and Ag/TA-CNC-PU were capable of lower glass transition temperatures and improved thermal stability. In addition, we found that the introduction of tannic acid and Ag NPs clearly increased the material hydrophobicity and antibacterial activity. In particular, the Ag/TA-CNC-PU had a better antibacterial effect on E. coli, while TA-CNC-PU had better inhibitory effect on S. aureus over a 24 h time period. Therefore, these novel CNCs-based PUs may be more beneficial for thermal processing and could potentially be developed into a new class of smart biomaterial material with good antibacterial properties by adjusting the ratio of TA or Ag NPs in their structures.
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