首页|DOPO基阻燃剂的合成及其在阻燃聚乳酸中的应用

DOPO基阻燃剂的合成及其在阻燃聚乳酸中的应用

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以9,10-二氢-9-氧杂-10-磷杂菲-10-氧化物(DOPO)、马来酸酐(MA)和三聚氰胺(ME)为原料,合成了一种新型的磷氮复合型阻燃剂(DMM),利用傅里叶变换红外光谱仪和热重分析仪对阻燃剂进行了表征.将DMM和聚乳酸(PLA)进行复配,制备了 PLA/DMM阻燃复合材料.极限氧指数、垂直燃烧测试(UL-94)、锥形量热测试等测试结果表明,当DMM质量分数为3%时,复合材料的UL-94测试达到了 V0级,LOI由21%提升至30%,其峰值热释放速率(PHRR)由510kW/m2下降至418 kW/m2,总热释放量(THR)由87 MJ/m2下降至73 MJ/m2,总烟释放量(TSR)由211 m2/m2下降至70 m2/m2,CO2释放量也有所下降.对燃烧后的炭层进行扫描电子显微镜分析,表明添加了 3%DMM的PLA复合材料生成了致密多孔的炭层,有效隔绝了氧气与热量的传递.DMM在燃烧过程中释放出大量不可燃气体,故DMM在凝固相和气相均起到了阻燃作用.力学性能测试结果表明,DMM的添加导致PLA力学性能略有下降.
Synthesis of DOPO-Based Flame Retardant and Its Application in Flame Retardant Polylactic Acid
A novel phosphorus-nitrogen composite flame retardant DMM was synthesized using 9,10-dihydro-9-oxa-10-phosphafi-10-oxide(DOPO),maleic anhydride(MA)and melamine(ME)as main raw materials.The structure and thermal stability of DMM were characterized by Fourier infrared spectroscopy(FT-IR)and thermogravimetric analysis(TGA),respectively.DMM and polylactic acid(PLA)were compounded to prepare flame retardant composites.The flame retardant properties of the composites were investigated by limiting oxygen index(LOI),vertical combustion test(UL-94)and cone calorimetric test(CCT)analysis.The results show that the flame retardant performance of the composites reaches UL-94 V0 level and LOI increases from 21%to 30%when the mass fraction of DMM is 3%.The peak heat release rate(PHRR)decreases from 510 kW/m2 to 418 kW/m2,the total heat release(THR)decreases from 87 MJ/m2 to 73 MJ/m2,the total smoke release(TSR)decreases from 211 m2/m2 to 70 m2/m2,and the amount of CO2 released also decreases.Scanning electron microscopy(SEM)analysis of the char layer after combustion reveals that the PLA composite with 3%DMM produces a dense and porous char layer which effectively cut off oxygen and heat transfer.In addition,DMM releases a large amount of non-combustible gas during combustion.Consequently,DMM can play a flame retardant role in the solid and gas phases.However,the mechanical performance test results show that the addition of DMM leads to a slight decrease in the mechanical properties of PLA.

polylactic acidphosphorus-nitrogen composite flame retardantflame retardationmechanical properties

范家鑫、江德志、黄吟秋、闫成宇、唐龙祥

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合肥工业大学化学与化工学院,安徽 合肥 230009

聚乳酸 磷氮复合型阻燃剂 阻燃 力学性能

2024

高分子材料科学与工程
中国石油化工股份有限公司科技开发部 国家自然科学基金委员会化学科学部 高分子材料工程国家重点实验室 四川大学高分子研究所

高分子材料科学与工程

CSTPCD北大核心
影响因子:0.563
ISSN:1000-7555
年,卷(期):2024.40(10)