摘要
针对聚对苯二甲酸乙二醇酯(PET)阻燃性较差的问题,以[(6-氧代-6H-二苯并[c,e][1,2]氧磷杂己环-6-基)甲基]丁二酸(DDP)和明胶基碳点(gCDs)构建复合阻燃体系,采用原位聚合法制备了阻燃DDP-gCDs-PET,借助扫描电子显微镜、傅里叶变换红外光谱仪对其结构进行分析,通过极限氧指数(LOI)、垂直燃烧(UL-94)及锥形量热指标研究了不同质量分数的gCDs与DDP复配后对PET阻燃性能的影响,并利用热重-傅里叶变换红外光谱分析探究了阻燃PET在气相中的热分解产物,提出了DDP、gCDs对PET的阻燃机制。结果表明:当添加DDP质量分数为8%、gCDs质量分数为1.0%时,DDP-gCDs-PET的UL-94等级提升至V-0级,LOI值可达到35%;相较于纯PET,DDP-gCDs-PET的热释放速率峰值降低39.77%,总热释放量降低25.00%,引燃时间延长25 s,阻燃效果显著改善;在燃烧过程中DDP促进了PET基体分解并在气相中淬灭自由基,gCDs使热量迅速扩散,提升了PET基体的热稳定性能,且gCDs在凝聚相促进成炭使DDP中的P留存于炭层中,二者共同作用提升了PET的阻燃性能。
Objective Polyethylene terephthalate(PET)is widely used because of its excellent comprehensive properties,but PET has poor flame retardancy,which greatly limits its application.Traditional halogenated flame retardants have great impact on the environment during combustion and cause damage to people's eye sight.Hence,the research of new halogen-free flame retardants is imperative.Method In this study,flame retardant polyester(DDP-gCDs-PET)was prepared with[(6-oxo-6H-dibenzo[c,e][1,2]oxahex-6-yl)methyl]succinic acid(DDP)and gelatin-based carbon dots(gCDs)as flame retardant by in-situ polymerization.To explore the flame retardant properties of PET,a study was conducted using limiting oxygen index(LOI),vertical combustion(UL-94)and cone calorimetry to assess the influence of gCDs with varying mass fractions.Results gCDs are quasi-spherical in structure,with an average particle size of about 3.34 nm and good dispersion.FT-IR spectra demonstrated the presence of amino groups and carboxyl groups on the surface of gCDs.In addition,FT-IR spectra also demonstrated the successful introduction of gCDs,DDP into PET molecular chains.When DDP was 8%and gCDs were 1.0%(named DDP-1.0gCDs-PET),the glass transition temperature of DDP-1.0gCDs-PET was increased by 9.33%compared with that of pure PET.The temperature at which ester mass decreases by 5%of DDP-1.0gCDs-PET was increased by 10.32℃compared to that of DDP-PET.Compared with PET,the peak heat release rate of DDP-1.0gCDs-PET was reduced by 39.77%,the total heat release was reduced by 25.00%,and the time to ignition was delayed by 25 s compared with that of PET.UL-94 and LOI studies show that DDP-1.0gCDs-PET had a LOI of up to 35%,and UL-94 was upgraded from V-2 to V-0.After the combustion of flame-retardant polyester,a continuous dense carbon layer was formed,which effectively hinders the spread of heat and gas and improves the flame retardant performance of the matrix.It is evident that DDP promoted the decomposition of the matrix and played the role of quenching free radicals when the matrix was burned.The addition of gCDs significantly reduced the concentration of CO_(2) and CO in meteorological products and improved the quality of the carbon layer.Conclusion Compared with pure PET,the flame retardant effect of DDP-gCDs-PET is significantly improved.The flame retardant mechanism of DPP and gCDs in PET system is understood.During the combustion process,gCDs absorb heat to form a heat conduction network,so that the heat diffuses rapidly and evenly in the matrix and delays the combustion of the matrix.DDP promotes decomposition of the matrix,while producing PO to quench free radicals in the gas phase and dilute combustible groups in the gas.gCDs promote the retention of P in DDP in the carbon layer,forming a large number of dense and continuous high-quality carbon layers in the solidified phase to achieve the purpose of flame retardancy.
作者
吴雨航
魏建斐
顾伟文
王玉萍
张安莹
王锐
WU Yuhang;WEI Jianfei;GU Weiwen;WANG Yuping;ZHANG Anying;WANG Rui(School of Materials Design and Engineering,Beijing Institute of Fashion Technology,Beijing 100029,China;Beijing Key Laboratory of Clothing Materials R&D and Assessment,Beijing Institute of Fashion Technology,Beijing 100029,China;New Vision Advanced Functional Fiber Innovation Center Co.,Ltd.,Suzhou,Jiangsu 215228,China)
出处
《纺织学报》
EI
CAS
CSCD
北大核心
2024年第6期1-10,共10页
Journal of Textile Research
基金
北京学者计划(RCQJ20303)
北京市自然科学基金项目(2222054号)
北京市教委科技计划项目(KM202110012007)。
关键词
聚对苯二甲酸乙二醇酯
明胶基碳点
磷系阻燃剂
原位聚合法
复配阻燃
阻燃机制
polyethylene terephthalate
gelatin-based carbon dot
phosphorus-based flame retardant
in situ polymerization method
compound flame retardant
flame retardant mechanism
