Mechanical and thermo-oxidative resistance properties of natural rubber film reinforced by orange peel-based carbon dots

作者：Jing Chen, Lusheng Liao, Lingyu Shang, Lijuan Du, Yinyi Lai, Jiahui Liu, Zinuo Yang, Ma Yukun, Wenfeng Peng, Fuquan Zhang · 发表于：Industrial Crops and Products · 年份：2024 · DOI：10.1016/j.indcrop.2024.120150 · 被引用次数：13 · 研究领域：Nanocomposite Films for Food Packaging、Polymer Nanocomposite Synthesis and Irradiation、Electrospun Nanofibers in Biomedical Applications

Bio-based carbon dots (CDs) have a wide range of precursor sources, abundant chemical functional groups, and good free radical scavenging ability. This makes them an excellent candidate for modifying natural rubber (NR). In this work, CDs were synthesized from orange peels using a hydrothermal process and were utilized to reinforce NR latex. The structure and properties of both the CDs (including morphology, functional groups and fluorescence emission spectra) and NR/CDs films (including crosslinking density, morphology, functional groups, and mechanical properties) were comprehensively investigated. The results indicate that the inclusion of CDs led to improvements in tensile and tear strength while maintaining undamaged elongation at break. The tube model results indicate that the Ge (the elastic modulus brought by entangled chains) is significantly higher than the Gc (the elastic modulus contributed by chemical crosslinking) in this system, suggesting that the physical entangled network play a more significant role than chemical cross-linking; and the trend of Gc+Ge with the amount of CDs aligns completely with the cross-linking density measured by swelling method. Additionally, it was observed that CDs exhibited excellent thermo-oxidative resistance properties for NR. After 24 hours of thermal aging, the aging coefficient increased from 20.7% (NR-0) to 65.8% (NR-7). Furthermore, with an increase in thermal aging time, the tensile strength and crosslinking density of NR-0 ...