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  

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

作　　者：石灵睿 吴小雨 曹海良 何文涛 SHI Lingrui;WU Xiaoyu;CAO Hailiang;HE Wentao(Hubei Key Laboratory for Processing and Application of Catalytic Materials,Huanggang Normal University,Huanggang 438000,China)

机构地区：[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

出　　处：《高等学校化学学报》2024年第12期162-172,共11页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:52103080)资助.

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/m^(2)和72.5 MJ/m^(2)降低到472.3 kW/m^(2)和67.5 MJ/m^(2).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%.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 cyclo⁃phosphazene 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/m^(2) and 72.5 MJ/m^(2) to 472.3 kW/m^(2) and 67.5 MJ/m^(2),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%.

关 键 词：聚乳酸 埃洛石纳米管 阻燃性能 紫外屏蔽性能 

分 类 号：O631[理学—高分子化学]