高等学校化学学报 ›› 2024, Vol. 45 ›› Issue (12): 20240323.doi: 10.7503/cjcu20240323

• 高分子化学 • 上一篇    下一篇

磷氮改性埃洛石纳米管的制备及对聚乳酸阻燃、 力学及紫外屏蔽性能的影响

石灵睿, 吴小雨, 曹海良, 何文涛()   

  1. 黄冈师范学院催化材料制备及应用湖北省重点实验室, 黄冈 438000
  • 收稿日期:2024-07-01 出版日期:2024-12-10 发布日期:2024-10-11
  • 通讯作者: 何文涛 E-mail:wentaohe@aliyun.com
  • 基金资助:
    国家自然科学基金(52103080)

Preparation of Phosphorus and Nitrogen Modified Halloysite Nanotube and Its Effects on the Flame Retardant, Mechanical and Ultroviolet Shielding Properties of Polylactic Acid

SHI Lingrui, WU Xiaoyu, CAO Hailiang, HE Wentao()   

  1. Hubei Key Laboratory for Processing and Application of Catalytic Materials,Huanggang Normal University,Huanggang 438000,China
  • Received:2024-07-01 Online:2024-12-10 Published:2024-10-11
  • Contact: HE Wentao E-mail:wentaohe@aliyun.com
  • Supported by:
    the National Natural Science Foundation of China(52103080)

摘要:

通过苯基磷酸插层和环磷腈网络包覆有机改性埃洛石, 制备了磷氮改性埃洛石纳米管(HM@PHNT), 系统研究了HM@PHNT作为多功能助剂对聚乳酸(PLA)热稳定性、 结晶行为、 阻燃性能、 力学性能及紫外屏蔽性能的影响. 研究结果表明, 添加5%(质量分数)的HM@PHNT, PLA的结晶度从7.7%显著增加到21.2%, 拉伸强度和断裂伸长率均得到一定的改善. 阻燃性能测试结果表明, 5%(质量分数)HM@PHNT的引入使PLA的热释放速率峰值和总热释放量分别由510.1 kW/m2和72.5 MJ/m2降低到472.3 kW/m2和67.5 MJ/m2. 阻燃机理分析表明HM@PHNT降解产生的P-N结构和HNT促进了炭层的形成, 从而降低了材料的热释放. 此外, PLA复合材料的紫外屏蔽性能显著提高, 在300 nm处的透过率由83.2%降低到1.0%.

关键词: 聚乳酸, 埃洛石纳米管, 阻燃性能, 紫外屏蔽性能

Abstract:

Phosphorus and nitrogen modified halloysite nanotube(HM@PHNT) was prepared by firstly intercalation of halloysite nanotube(HNT) with phenyl phosphate and then encapsulation of the modified halloysites with a cyclophosphazene network. The effects of the multifunctional additive HM@PHNT on the thermal stability, crystallization behavior, flame retardancy, mechanical properties, and UV shielding performance of polylactic acid(PLA) were systematically investigated. The results indicate that with the addition of 5%(mass fraction) HM@PHNT, the crystallinity of PLA significantly increases from 7.7% to 21.2%, and the tensile strength and elongation at break are both improved to some extent. Flame retardant test shows that the introduction of 5%(mass fraction) HM@PHNT reduces the peak heat release rate and total heat release of PLA from 510.1 kW/m2 and 72.5 MJ/m2 to 472.3 kW/m2 and 67.5 MJ/m2, respectively. The analysis of flame retardant mechanism indicates that P-N structure and HNT generated by HM@PHNT degradation promote the formation of the charring layer, thereby reducing the heat release of the material. In addition, the UV shielding performance of PLA composite materials has been significantly improved, with a decrease in transmittance at 300 nm from 83.2% to 1.0%.

Key words: Polylactic acid, Halloysite nanotube, Flame retardancy, UV-shielding performance

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