Protein-Mediated ZnO Synthesis for Self-Healing in Natural Rubber
Issued Date
2024-01-01
Resource Type
ISSN
14387492
eISSN
14392054
Scopus ID
2-s2.0-85186900541
Journal Title
Macromolecular Materials and Engineering
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SCOPUS
Bibliographic Citation
Macromolecular Materials and Engineering (2024)
Suggested Citation
Fueangphakdee P., Nimpaiboon A., Junkong P. Protein-Mediated ZnO Synthesis for Self-Healing in Natural Rubber. Macromolecular Materials and Engineering (2024). doi:10.1002/mame.202300406 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/97577
Title
Protein-Mediated ZnO Synthesis for Self-Healing in Natural Rubber
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Abstract
Natural rubber (NR) consists of mainly cis-1,4-polyisoprene with proteins as notable nonrubber components that significantly influence its properties. A relatively unexplored aspect is the role of these proteins in reducing and stabilizing metal ions to form metallic particles. Here, the NR/ZnO composite is successfully prepared by in situ generation of ZnO in the NR latex for the first time. With the aid of the proteins, the amount of ZnO is slightly higher than that formed in the saponified NR latex (SPNR), where some proteins are removed. Importantly, the noncovalent bonds between the proteins and/or amino acids with the ZnO formed in the NR latex can provide the self-healing behavior of the NR/ZnO composite. However, heating at ≈40 °C is still necessary for reducing the healing time and increasing the self-healing efficiency of the composite. Nevertheless, greater noncovalent bonds within NR/ZnO hinder rubber molecular chain interdiffusion and rearrangement essential for self-healing behavior in uncross-linked rubber, resulting in lower healing efficiency compared to SPNR/ZnO. This study underscores the significance of proteins and/or amino acids on NR's properties, despite their minor presence. Without sophisticated NR modification, this is a very simple and low-cost technique to achieve the NR/ZnO composite with self-healing behavior.