棉秆皮微晶纤维素/改性氧化石墨烯阻燃纤维的制备及其性能  

Preparation and performonce of cotton stalk bast microcrystalline cellulose/modified graphene oxide composite flame-retardant fiber

作　　者：谷金峻 魏春艳 郭紫阳 吕丽华 白晋 赵航慧妍 GU Jinjun;WEI Chunyan;GUO Ziyang;L Lihua;BAI Jin;ZHAO Hanghuiyan(School of Textile and Material Engineering,Dalian Polytechnic University,Dalian,Liaoning 116034,China)

机构地区：[1]大连工业大学纺织与材料工程学院,辽宁大连116034

出　　处：《纺织学报》2024年第1期39-47,共9页Journal of Textile Research

基　　金：辽宁省自然基金指导计划项目(2019-ZD-0295)。

摘　　要：为提高棉秆皮微晶纤维素(MCC)纤维的阻燃性能,采用9,10-二氢-9-氧杂-10-磷杂菲-10-氧化物(DOPO)为改性剂对氧化石墨烯(GO)进行改性,将改性后的GO(DOPO-GO)与MCC共混,通过湿法纺丝制得MCC/DOPO-GO阻燃纤维,并对其阻燃性能、热学性能和力学性能进行分析。结果表明:添加DOPO-GO阻燃剂的MCC纤维的极限氧指数为27.3%,较MCC纤维提高了66.5%;与MCC纤维相比,MCC/DOPO-GO阻燃纤维热分解所需的热焓值由221.8 J/g提升至1502 J/g,热学稳定性得到提高;MCC/DOPO-GO阻燃纤维燃烧后形成的残炭致密且连续,石墨化程度提高;MCC/DOPO-GO纤维的力学性能也得到了极大改善,其断裂强度由MCC纤维的0.4 cN/dtex提高至2.2 cN/dtex。Objective Cotton stalk bast microcrystalline cellulose(MCC)is microcrystalline cellulose extracted from waste cotton stalks.MCC fiber prepared from MCC has outstanding performances in coloration and moisture absoprtion.However,the flame retardant performance of MCC fiber is unsatisfactory,which limitsthe continued development of MCC fiber.The surface grafting method was adopted to modify graphene oxide(GO)by adding phosphorus.The modified GO was mixed with MCC to prepare composite fibers to improve the flame retardant performance of MCC fibers.Methods In this paper,9,10-dihydro-9-oxa-10-phosphophenanthrene-10-oxide(DOPO)was used as the modifier to modify graphene oxide(GO)by electrophilic substitution.In the process of GO modification,P—H in DOPO molecule opens the epoxy ring on the surface of GO,so that P forms a covalent bond with C on the epoxy ring on the surface of GO,and was grafted with GO.The phosphorus-containing flame retardant DOPO-GO prepared in the previous process was added to the MCC spinning liquid by physical blending,and DOPO-GO was uniformly distributed in the spinning liquid by ultrasonic dispersion,and MCC/DOPO-GO fiber with good flame retardant performance was prepared by wet spinning.The mechanical properties,thermal properties and flame retardant properties were analyzed.Results DOPO was successfully grafted onto graphene oxide,decreases the DOPO-GO particle diameter,and destroys the arrangement regularity of GO lamellar,which was conducive to reducing GO agglomeration and improving the dispersion uniformity of GO in the spinning solution,and increases the break strength of MCC/DOPO-GO fibers by 450%.The enthalpy values of MCC/GO and MCC/DOPO-GO fibers are increased by 916.2 and 1280.2 J/g,respectively,compared with MCC fibers.It shows that the thermal stability of the fiber is improved,indirectly showing that GO and DOPO-GO can improve the flame retardant properties of the fibers.The flame retardant DOPO-GO contains the green flame retardant element P,and the P element is evenly distrib

关 键 词：棉秆皮微晶纤维素 9 10-二氢-9-氧杂-10-磷杂菲-10-氧化物 氧化石墨烯 阻燃性能 力学性能 

分 类 号：TS102.2[轻工技术与工程—纺织工程]