Interfacial silicon‑nitrogen aerogel raise flame retardancy of bamboo fiber reinforced polylactic acid composites.

Qianqian Niu, Xiaopeng Yue, Weihong Cao, Zhenghong Guo, Zhengping Fang, Peng Chen, Juan Li

Journal: International journal of biological macromolecules 2022;222(Pt B):2697-2708

PMID: 36228818

Full Text on Elsevier Science View on PubMed

Abstract

A triazine derivative containing nitrogen and silicon (SiN) was synthesized and the SiN hybrid aerogel was covered on the surface of bamboo fiber (BF). The modified BF was identified as MBF. The MBF and ammonium polyphosphate (APP) were used to regulate the flame retardancy and mechanical properties of polylactic acid (PLA). The PLA/BF composites were investigated using limiting oxygen index (LOI), UL-94 vertical combustion, cone calorimetry, thermogravimetric analysis linked with infrared spectra (TG-IR) etc. The char residue of MBF at 800 °C is as high as 43.5 % which is 200 % more than that of BF. Incorporating 9 wt% APP generates a PLA9 which displays the UL-94 V2 rating and a LOI value of 28.0 vol%. PLA9/MBF composites display the UL-94 V0 rating and increased LOI values while PLA9/BF composites obtain the UL-94 V2 rating and decreased LOI. The MBF reduces the release of flammable gases during combustion, enhances charring ability and decreases the thermal conductivity of composites. Besides, the tensile and impact strength of PLA9/20MBF is 20 % and 37 % more than that of PLA9/20BF due to stronger interfacial adhesion. This work provides a good method to regulate the flame retardancy and mechanical properties of PLA/BF composites.

Address: Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China; Shaanxi Province Key Laboratory of Papermaking Technology and Specialty Paper, National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi University of Science and Technology, Xi'an 710021, Shaanxi, China; Quantum Dot Optical Material and Technology Innovation Team, Guangdong Odiming Optoelectronic Tech. Co., Ltd., Zhaoqing 526238, China.; Shaanxi Province Key Laboratory of Papermaking Technology and Specialty Paper, National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi University of Science and Technology, Xi'an 710021, Shaanxi, China.; Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China.; School of Materials Science and Engineering, NingboTech University, Ningbo 315100, China.; Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China. Electronic address: [email protected].; Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China; School of Materials Science and Engineering, NingboTech University, Ningbo 315100, China; Quantum Dot Optical Material and Technology Innovation Team, Guangdong Odiming Optoelectronic Tech. Co., Ltd., Zhaoqing 526238, China. Electronic address: [email protected].

DOI: 10.1016/j.ijbiomac.2022.10.051

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MeSH Terms: Silicon, Nitrogen, Flame Retardants, Microscopy, Electron, Scanning, Polyesters, Polyphosphates, Ammonium Compounds, Dietary Fiber