羟基烷酸
材料科学
复合材料
插层(化学)
复合数
韧性
原位聚合
阻燃剂
极限氧指数
纳米复合材料
模数
聚酯纤维
断裂韧性
聚合物
聚合
化学工程
烧焦
热解
化学
有机化学
遗传学
细菌
工程类
生物
作者
Ping Xu,Gaopeng Qi,Dongxuan Lv,Deyu Niu,Weijun Yang,Huiyu Bai,Xiu‐Ping Yan,Xu Zhao,Piming Ma
标识
DOI:10.1016/j.ijbiomac.2023.123345
摘要
Polyhydroxyalkanoates (PHA) is a biodegradable polyester, and its application range is limited by the poor flame retardancy and low modulus. Bentonite (BNT) as a green inorganic filler can improve the modulus and flame retardancy of PHA to a certain extent. An in situ polymerization method was designed to intercalate P-N-containing hyperbranched macromolecules (HBM) among BNT layers (HBM-B) and to improve the flame retardancy while improving the dispersion of BNT in the PHA matrix. The layer spacing of BNT was increased from 1.2 nm to 4.5 nm. The effect law of the joint action of in situ intercalation of BNT and the HBM on flame retardancy and mechanical properties of PHA was systematically studied. The HBM-B showed stronger flame retardancy when the mass ratio of HBM to BNT was 75/25. The limiting oxygen index (LOI) of the PHA/HBM-B composite was increased to 27.6 % while maintaining good toughness. Compared to the physical blend of HBM and BNT (HBM/B), the elongation at break of PHA/HBM-B25 composites can be increased by up to 10 times. When the content of HBM-B is up to 15 wt%, the LOI of PHA-Based composites can reach 29.6 % and the UL-94 rating reaches V-0, which meets the standard of flame-retardant material. Therefore, the present work is expected to expand the application of PHA-based composites in the field of flame retardancy.
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