Chem. J. Chinese Universities ›› 2024, Vol. 45 ›› Issue (12): 20240323.doi: 10.7503/cjcu20240323

• Polymer Chemistry • Previous Articles     Next Articles

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)

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

CLC Number: 

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