期刊
JOURNAL OF POLYMER RESEARCH
卷 28, 期 12, 页码 -出版社
SPRINGER
DOI: 10.1007/s10965-021-02826-1
关键词
Isotactic polypropylene; beta-nucleating agent; Esterified lignin; Crystallization; Mechanical properties
资金
- National Natural Science Foundation of China [21376031]
- Hunan Provincial Natural Science Foundation of China [2019JJ40294]
The study showed that esterified lignin metal salts can serve as effective nucleating agents for isotactic polypropylene (iPP), resulting in increased crystallization temperature and improved toughness. Among them, EL-Zn exhibited strong beta-crystal induction ability to iPP, with potential applications in enhancing the mechanical properties of iPP composites.
This study reported a series of esterified lignin metal salts (EL-M, M = Na, Mg, Ca, Ba, Zn) derived from lignin as nucleating agents, which were used in isotactic polypropylene (iPP). The crystallization and melting behavior and mechanical properties of iPP/EL-M composites were studied. The results of differential scanning calorimetry (DSC) and wide-angle X-ray diffraction (WAXD) revealed that the crystallization temperature of iPP/EL-M composites increased by 5 to 8 degrees C compared with that of pure iPP. Simultaneously, EL-Zn, EL-Ba and EL-Ca all had strong beta-crystal induction ability to iPP. Especially, when the addition amount of EL-Zn in iPP was 0.20 wt%, the relative beta-content of iPP/EL-Zn reached up to 0.9277, and it was basically not affected by the cooling rate, indicating that EL-Zn was extremely active, selective and stable for iPP. For the vantage, the results of mechanical properties and SEM revealed that EL-Zn, EL-Ba or EL-Ca could improve the toughness of iPP to a certain extent.
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