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

文献类型： 外文期刊

作者： Chen, Jing 1 ; Liao, Lusheng 2 ; Shang, Lingyu 1 ; Du, Lijuan 1 ; Lai, Yinyi 1 ; Liu, Jiahui 1 ; Yang, Zinuo 1 ; Ma, Yukun 1 ; Peng, Wenfeng 2 ; Zhang, Fuquan 2 ;

作者机构： 1.Lingnan Normal Univ, Key Lab Clean Energy Mat Chem Guangdong Higher Edu, Sch Chem & Chem Engn, Zhanjiang, Peoples R China

2.Chinese Acad Trop Agr Sci, Hainan Prov Key Lab Nat Rubber Proc, Agr Prod Proc Res Inst, Zhanjiang 524001, Guangdong, Peoples R China

关键词： Natural rubber latex; Orange peel-based carbon dots; Mechanical properties; Thermo-oxidative resistance performance

期刊名称：INDUSTRIAL CROPS AND PRODUCTS （ 影响因子：6.2； 五年影响因子：6.2 ）

ISSN： 0926-6690

年卷期： 2025 年 223 卷

页码：

收录情况： SCI

摘要： 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 decreased at a faster rate compared with NR-5. At an aging time of 40 hours, the tensile strength of NR-0 was reduced to 0.53 MPa and almost completely failed; whereas the tensile strength of NR-5 was still maintained at 8.2 MPa. Overall, the addition of CDs dramatically improved the thermo-oxidative resistance and mechanical properties of the NR film. Simultaneously, a novel way involving the utilization of orange peel with high value is being proposed.

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