氧化石墨烯协同二硫代焦磷酸酯阻燃粘胶纤维的制备及其性能

为提高粘胶/二硫代焦磷酸酯(VF/DDPS)纤维的阻燃及力学性能,以氧化石墨烯(GO)作为协同阻燃剂添加到VF/DDPS基体中,通过湿法纺丝工艺制得VF/DDPS/GO复合纤维。借助热重分析仪、极限氧指数仪、微型量热仪和单丝强力仪研究GO对VF/DDPS复合纤维热性能、阻燃性能和力学性能的影响。结果表明:与VF/DDPS纤维相比,当GO质量分数为2.0%时,VF/DDPS/GO复合纤维的残炭量从20.0%增加到29.7%,极限氧指数从27.8%升高到29.1%,热释放速率峰值从141.5 W/g降低到99.4 W/g,干、湿断裂强度分别从2.08、0.96 cN/dtex增加到2.20、1.17 cN/dtex;GO的添加可提高VF/DDPS炭渣的石墨化程度和致密度,增强炭渣的热质阻隔作用。

Preparation and properties of flame-retardant viscose fiber/dithiopyrophosphate incorporated with graphene oxide

To improve the flame-retardant and mechanical properties of viscose fiber/bisneopentyl glycol dithiopyrophosphate(VF/DDPS),graphene oxide(GO)was incorporated into VF/DDPS matrix as synergistic flame retardant to prepare VF/DDPS/GO composite fiber through wetting spinning.Using thermogravimetry,limiting oxygen index tester,microscale combustion calorimeter and single fiber tensile tester as performance indices,the effect of GO on the thermal,flame-retardant and mechanical properties of VF/DDPS composite fiber were studied.The results show that compared to VF/DDPS,when incorporating 2.0%GO,the char residues of VF/DDPS/GO composite fiber increases from 20.0%to 29.7%,limiting oxygen index rises from 27.8%to 29.1%,peak heat release rate decreases from 141.5 to 99.4 W/g and dry/wet breaking strength increases from 2.08,0.96 cN/dtex to 2.20,1.17 cN/dtex.It is concluded that GO could enhance the graphitic degree and compactness of char residues,which strengthens the barrier action of heat and mass.