含磷丙烯酸酯核壳阻燃剂的合成及其在聚乳酸中的应用
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华北理工大学材料科学与工程学院

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河北省自然科学基金资助项目(E2019209446)


Synthesis of Phosphorus Containing Acrylate Core-shell Flame Retardant and Its Application in Poly(lactic acid)
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    摘要:

    为了同时改善聚乳酸(PLA)阻燃性和韧性,本文以甲基膦酸二乙酯丙烯酸酯(DEAMP)为核层材料、甲基丙烯酸甲酯(MMA)为壳层材料,三烯丙基异氰酸酯(TAIC)为核层交联剂,通过种子乳液聚合法,制备了平均粒径约为190nm的含磷丙烯酸酯核壳阻燃剂(P-CM),透射电镜(TEM)图片显示了典型的核壳结构。差示扫描量热仪(DSC)和热重分析(TG)测试结果表明,P-CM的核层、壳层玻璃化转变温度分别为-13.6℃和115.6℃,初始分解温度(Td5%)为263℃,分解后残余物为36wt%。将5%P-CM用于增韧和协效10%APP/5%β-CD阻燃的PLA,结果表明,与10%APP/10%β-CD阻燃的PLA比,极限氧指数(LOI)提高了5.7%;同时,材料冲击强度提高了182.5%,拉伸强度提高了2.9%,断裂伸长率增加了28.9%,获得了具有高阻燃性和高韧性的PLA材料。

    Abstract:

    In order to simultaneously endowing the flame retardancy and toughness of poly (lactic acid) (PLA), a phosphorus containing acrylate core-shell flame retardant (P-CM) with an average particle size of about 190nm was prepared by seed emulsion polymerization using DEAMP core material, methyl methacrylate (MMA) as shell material and three allyl isocyanate (TAIC) as crosslinking agent. TEM results show that it has a typical core-shell structure. The thermal properties of PLA materials was characterized by differential scanning calorimetry (DSC) and thermogravimetric analysis (TG). The results showed that: the glass transition temperatures of the core and shell of P-CM were 13.6 ℃ and 115.6 ℃ respectively, the initial decomposition temperature (Td5%) was 263 ℃, and the residue after decomposition was 36wt%. After adding 5% P-CM to toughening and synergistic 10%App/5%β-CD flame retardant PLA, its limiting oxygen index (LOI) value was increased by 32.9%. It is worth mentioned that the toughness of modified P-CM is improved greatly, in which the impact strength increased by 182.5%, the tensile strength increased by 2.9%, and the elongation at break increased by 28.9%, respectively. The PLA material with high flame retardancy and toughness was obtained.

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  • 收稿日期:2021-10-30
  • 录用日期:2022-03-27
  • 网络出版日期:2021-11-30
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