Highly efficient flame retardant poly(lactic acid) using imidazole phosphate poly(ionic liquid)
Highly efficient flame retardant poly(lactic acid) using imidazole phosphate poly(ionic liquid)
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DOI：
10.1002/pat.4903
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发表时间：
2020-03-17
影响因子：
3.4
通讯作者：
Li, Juan
中科院分区：
文献类型：
--
作者：
Li, Caixia;Ma, Chao;Li, Juan
离子液体由于具有良好的热稳定性、不可燃性和丰富的结构可设计性，被用作聚乳酸（PLA）的阻燃剂。但IL作为小分子，存在热稳定性差、耐水性差等缺点。本文以1-乙烯基咪唑、磷酸三乙酯和1,2-二乙烯基苯为原料合成了一种含磷酸阴离子的咪唑型聚离子液体（PIL），标记为PDVE[DEP]。采用PDVE[DEP]提高PLA的阻燃性。采用极限氧指数（LOI）、UL-94垂直燃烧、锥量热法、热重分析等方法研究了PLA/PDVE[DEP]复合材料的阻燃性能和热降解性能。结果表明，仅1.0 wt%的PDVE[DEP]就可以使PLA达到UL-94 V0额定值并获得25.6 vol%的LOI值。PDVE[DEP]通过熔脱方式提高PLA的阻燃性。此外，它还能催化聚乳酸的酯交换反应，改变降解产物。
Because of good thermal stability, nonflammability and rich structural designability, ionic liquids (ILs) have been used as flame retardants for poly(lactic acid) (PLA). However, as a small molecule, IL has the disadvantages of poor thermal stability and water resistance, and so on. In this paper, an imidazole-type poly(ionic liquid) (PIL) containing a phosphate anion was synthesized using 1-vinylimidazole, triethyl phosphate, and 1,2-divinylbenzene and marked as PDVE[DEP]. The PDVE[DEP] was used to improve the flame retardancy of PLA. The flame retardancy and thermal degradation behaviors of PLA/PDVE[DEP] composites were investigated by the limited oxygen index (LOI), UL-94 vertical burning, cone calorimetry, and thermal gravity analysis, and so on. The results showed that only 1.0 wt% PDVE[DEP] allows PLA to achieve the UL-94 V0 rating and obtain LOI value 25.6 vol%. The PDVE[DEP] improve the flame retardancy of PLA by melting-away mode. In addition, it catalyzes the transesterification of PLA and changes the degradation products.