Rheological and spinning properties of PET modified by tetradecanedioic acid copolymerization
Using a capillary rheometer,the impact of adding modified monomer tetradecanedioic acid on the rheological characteristics of modified polyethylene terephthalate(PET)was investigated.The investigation encom-passed studying the impact of temperature and shear rate on the apparent viscosity(ηa)of copolyesters,as well as the viscous flow activation energy(Eη).Additionally,the study examined the influence of non Newtonian index(n)on the melt spinning performance of the copolyester UDY-DT method and the process route.The findings dem-onstrated that copolyesters were typical pseudoplastic non-Newtonian fluids,with ηa and Eη decreasing with increas-ing tetradecanedioic acid concentration.The n value rised with temperature,and at 270,275,and 280℃,the n value of copolyesters was marginally lower than that of blank PET.The n value of a copolyester containing 4%tet-radecanedioic acid was equal to that of a blank PET at 285℃.The structure viscosity index(Δη)of copolyes-ters decreased with increasing temperature.The copolyester containing 4%tetradecanedioic acid and blank PET Δη was heated to 285℃.Right now,the spinnability is good and the value is equivalent.Component pressure and spinning machine load both drop with increasing tetradecanedioic acid concentration.Tetradecanedioic acid modified copolyester fibers exhibit good spinnability,can nearly match wearable fiber performance indicators for strength and elongation,and have somewhat increased softness when compared to conventional polyester.
polyethylene terephthalatetetradecanedioic acidmodified copolymerizationrheological proper-tynon-Newtonian index
万方数据
维普
