Zhao Qiangli, Cheng Xiaoyue, Kang Jiahao, Kong Lingyan, Zhao Xiaoliang, He Xinhai, Li Jianwei
Xi'an Key Laboratory of Textile Composites, School of Materials Science and Engineering, Xi'an Polytechnic University, Xi'an 710048, Shaanxi, China; China National Textile and Apparel Council Key Laboratory of Flame Retardancy Finishing of Textile Materials, Soochow University, Suzhou 215123, China.
Xi'an Key Laboratory of Textile Composites, School of Materials Science and Engineering, Xi'an Polytechnic University, Xi'an 710048, Shaanxi, China.
Int J Biol Macromol. 2023 Aug 15;246:125682. doi: 10.1016/j.ijbiomac.2023.125682. Epub 2023 Jul 3.
The research of additive biomass flame retardants is becoming more and more popular. In this work, amino modified halloysite nanotubes (A-HNTs), chitosan (CS) and phytic acid (PA) were introduced into polyvinyl alcohol (PVA) matrix to construct PA/A-HNT/CS/PVA organic-inorganic composite film with hydrogen bond and covalent bond cross-linking network structure. Adding PA/A-HNT/CS can remarkably improve the mechanical strength, UV resistance and thermal stability of PVA film. Compared with control PVA film, the transmittance of composite film in ultraviolet region decreases from 90 % to <15 %, and the tensile strength raises from 19.8 MPa to 31.0 MPa. The thermal decomposition temperature of the composite film increases, the weight loss rate decreases obviously, and the carbon residue can reach 26 wt% at 700 °C. The limiting oxygen index increases from 18.5 % to 32.2 %. Furthermore, the addition of this flame-retardant system can obviously reduce the combustion intensity of PVA, and its flame-retardant grade can reach V-0. It is of great significance to expand the application of PVA and the development of biomass flame retardant.
添加型生物质阻燃剂的研究越来越受到关注。在本工作中，将氨基改性埃洛石纳米管（A-HNTs）、壳聚糖（CS）和植酸（PA）引入聚乙烯醇（PVA）基体中，构建具有氢键和共价键交联网络结构的PA/A-HNT/CS/PVA有机-无机复合薄膜。添加PA/A-HNT/CS能显著提高PVA薄膜的机械强度、抗紫外线性能和热稳定性。与对照PVA薄膜相比，复合薄膜在紫外区域的透过率从90%降至<15%，拉伸强度从19.8MPa提高到31.0MPa。复合薄膜的热分解温度升高，失重率明显降低，700℃时残炭率可达26wt%。极限氧指数从18.5%提高到32.2%。此外，添加该阻燃体系能明显降低PVA的燃烧强度，其阻燃等级可达V-0级。这对于拓展PVA的应用和生物质阻燃剂的发展具有重要意义。
