摘要
为提升细菌纤维素(BC)气凝胶的力学性能和阻燃性能,将芳纶纳米纤维(ANF)作为增强材料与原位生长的BC复合制备了BC原位复合ANF(BC/ANF)气凝胶。采用FTIR、XRD和SEM对BC/ANF气凝胶进行了结构表征,测试了BC/ANF气凝胶的热性能、阻燃性能和拉伸断裂性能,考察了ANF含量(以BC培养基质量计,下同)对BC/ANF气凝胶结构和性能的影响。结果表明,相较于BC气凝胶,ANF含量5.0%的BC/ANF气凝胶(BC/ANF-5.0%)的拉伸强度(946.13 kPa)增加了6.42倍,断裂伸长率(19.61%)提高了6.00倍,极限氧指数提高至22.38%,比表面积(78.2688 m^(2)/g)增大了42%,导热系数降低至0.0352 W/(m·K)。ANF中的酰胺基团与BC中的羟基形成氢键,增强了二者的结合力;ANF在BC纤维网络中填充、缠绕,会产生范德华力促使二者相互吸引靠近,进而增强BC/ANF气凝胶的力学性能。ANF与BC纳米级的结合有效抑制了左旋葡萄糖的形成和分解,促进了炭化,大幅度提升了BC/ANF气凝胶的热稳定性和阻燃性能。
In order to improve the mechanical strength and flame retardancy of bacterial cellulose(BC)aerogel,BC/aramid nanofiber(ANF)aerogels were prepared from compounding of ANF,as reinforcement material,with in situ grown BC,characterized by FTIR,XRD and SEM for structural analysis,and analyzed for thermal properties,flame retardancy and tensile fracture properties.The effects of ANF content(based on the mass of BC culture medium,the same below)on the structure and properties of BC/ANF aerogel were further evaluated.The results showed that compared with those of BC aerogel,the tensile strength(946.13 kPa)of BC/ANF aerogel with ANF content of 5.0%(BC/ANF-5.0%)was enhanced by 6.42 times,the elongation at break(19.61%)was increased by 6.00 times,the limiting oxygen index was increased to 22.38%,the specific surface area(78.2688 m^(2)/g)was enhanced by 42%while the thermal conductivity was decreased to 0.0352 W/(m·K).The hydrogen bonds,formed between amide groups in ANF with the hydroxyl groups in BC,enhanced the binding force between the two.The filling and winding of ANF in BC fiber network generated van der Waals forces leading to the attraction and approaching of each other,thus improving the mechanical properties of the BC/ANF aerogel.The nanoscale combination of ANF and BC effectively inhibited the formation and decomposition of L-glucose,promoted carbonization,and significantly improved the thermal stability and flame retardancy of BC/ANF aerogel.
作者
候风雷
王晓
杜冰
李佥
HOU Fenglei;WANG Xiao;DU Bing;LI Qian(School of Textile and Material Engineering,Dalian Polytechnic University,Dalian 116034,Liaoning,China;School of Biological Engineering,Dalian Polytechnic University,Dalian 116034,Liaoning,China)
出处
《精细化工》
北大核心
2025年第10期2107-2114,2123,共9页
Fine Chemicals
基金
2024年度辽宁省属本科高校基本科研业务费专项资金资助项目(LJ212410152027)。
关键词
细菌纤维素
芳纶纳米纤维
复合气凝胶
原位复合
功能材料
bacterial cellulose
aramid nanofiber
composite aerogels
in-situ composite
functional materials
