期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 5, 期 9, 页码 7894-7904出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.7b01430
关键词
Core-shell; Nanofibrous; Flame retardant; Poly(lactic acid) (PLA); Mechanical property
资金
- Scientific Research Foundation of Zhejiang AF University [2055210012]
- National Natural Science Foundation of China [51303162, 51628302]
- Zhejiang Provincial Natural Science Foundation of China [Q15C160002]
- Program for Key Science and Technology Team of Zhejiang Province [2013TD17]
- Commonwealth Project of the Science and Technology Agency of Zhejiang Province of China [2017C37078]
- Industrial Transformation Training Centre [IC170100032]
Despite extraordinary mechanical properties and excellent biodegradability, poly(lactic acid) (PLA) still suffers from a highly inherent flammability, restricting its wide applications in the electric and automobile fields. Although a wide range of flame retardants have been developed to reduce the flammability, so far, they normally compromise the mechanical strength of PLA. Herein, we have demonstrated the fabrication of a novel core shell nanofibrous flame-retardant system, PN-FR@CNF, through in situ chemically grafting the phosphorus nitrogen-based polymer onto the cellulose nanofiber (CNF) surface. The results show that adding 10 wt % PN-FR@CNF enables PLA to achieve a V-0 flame resistance rating during vertical burning tests and to exhibit dramatically reduced peak heat release rate calorimetry measurements, indicating a significantly reduced flammability. In addition, the tensile strength of PLA also increases by around 24% (about 72 MPa). This work offers an innovative methodology for the design of the unique integration of extraordinary flame retardancy and mechanical reinforcement into one hierarchical nanostructured additive system for creating advanced green polymeric materials.
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