Study On Preparation,curing And Properties Of Phenolic Epoxy Fiber

Phenolic fiber was a newly developed type of heat-resistant organic fiber material that is created through spinning.The raw material used in its production is phenolic resin,which,after spinning and curing,results in a fiber that was highly resistant to corrosion-resistant,hightemperature heat-insulating,smokeless and non-toxic.However,the pure phenolic fiber had limited application due to its poor toughness and high brittleness.Therefore,improving the spinning process and toughness of phenolic fiber had became the primary focus of current research.In this study,primary fiber(PF)was prepared using phenolic epoxy resin(F-44)through the melt spinning method.The curing kinetics of phenolic fiber,the content of curing agent ethylenediamine(EDA),thermal curing temperature,and microwave curing were investigated to determine their impact on the performance of the fibers.The study also looked at the effect of power,curing time,and curing method on the fiber performance.In this study,F-44 phenolic epoxy primary fibers were prepared using the melt-spinning method and were subjected to two different curing treatments: thermal-cured treatment(TC)and microwave-cured treatment(MC).The curing kinetics,as well as the content of different mass fractions of curing agent ethylenediamine(EDA),thermal-cured conditions(temperature and time),thermal-cured conditions(power and time),and curing methods(thermal-cured and thermal-cured)were systematically studied to determined their influence on the mechanical properties of the fibers.The composition and morphology of the sample were analyzed using various analytical methods including GPC,FT-IR,TG,SEM,among others.The experimental results showed that under thermal-cured conditions,the residual carbon rate of F-44 phenolic epoxy fiber was 6.2%,the elongation at break was 13.61%,and the breaking strength was 121MPa;The residual carbon rate of the fiber was 7.4%,the elongation at break was 15.92%,and the breaking strength was 125 MPa.Compared with thermal-cured treatment,the residual carbon rate,elongation at break and breaking strength of the fiber after microwave-cured treatment increased by 19%,20% and 3% respectively.In this study,a high-ortho-position thermosetting phenolic resin solution(TPRS)was synthesized and blended with phenolic epoxy resin(F-44)in a specific mass ratio.The resulting primary fiber was prepared using a melt spinning method and subsequently processed via thermal-cured(TC)and microwave-cured(MC).This study investigates the impact of curing kinetics,the ratio of different thermosetting phenolic resin solutions(TPRS)to phenolic epoxy resin(F-44),thermal-cured conditions(temperature and time),microwave-cured conditions(power and time),as well as curing methods(thermal-cured and microwave-cured)on the mechanical properties of fibers.The composition and morphology were characterized by GPC,FT-IR,TG,SEM and other analytical methods.The experimental results showed that under thermal-cured conditions,the residual carbon rate of the blended phenolic epoxy fiber was34.1%,the elongation at break was 7.23%,and the breaking strength was 151 MPa;under microwave conditions,the F-44 phenolic epoxy fiber The residual carbon rate was 34.5%,the elongation at break was 8.72%,and the breaking strength was 163 MPa.Compared with thermal-cured treatment,the residual carbon rate,elongation at break and breaking strength of the fiber after microwave-cured treatment increased by 1%,21% and 8% respectively.