再生与原生涤纶DTY的结构与性能对比

Contrast of structure and properties of recycled and original polyester DTY

采用扫描电子显微镜、傅里叶变换红外光谱仪、X射线衍射仪、差示扫描量热仪、热重分析仪、纱线强伸度仪等对物理法、化学法再生涤纶低弹丝(DTY)及原生涤纶DTY的结构与性能进行了表征与比较。结果表明:再生涤纶DTY相比原生涤纶DTY表面含有更多的颗粒状物质,在分子结构上与原生涤纶DTY并无明显区别;再生涤纶DTY的结晶度较原生涤纶DTY的低,物理法再生涤纶DTY的结晶度最低;化学法再生涤纶DTY的玻璃化转变温度、熔点和熔融热与原生涤纶DTY的相差不大,而物理法再生涤纶DTY的较低;再生涤纶DTY比原生涤纶DTY的热稳定性稍差;再生涤纶DTY的断裂强度较原生涤纶DTY的低,而物理法再生涤纶DTY的断裂伸长率较高,且再生涤纶DTY的断裂强度与断裂伸长率变异系数也都较高;化学法再生涤纶DTY的卷曲收缩率、卷曲稳定度和沸水收缩率与原生涤纶DTY的相差不大,物理法再生涤纶DTY的则明显较小。

The structure and properties of physically or chemically recycled low elastic polyester yarn(DTY)and original polyester DTY were characterized and compared by scanning electronic microscopy,Fourier transform infared spectrometry,X-ray diffraction,differential scanning calorimetry,thermogravimetric analysis,tensile strength test.The results showed that the recycled polyester DTY had more particle substance on the surface,but no obvious difference in molecular structure,as compared with the original polyester DTY;the recycled polyester DTY,especially recycled by physical method,had lower crystallinity than the original polyester DTY;the chemically recycled polyester DTY had similar glass transition temperature,melting point and melting heat when the physically recycled polyester DTY was lower than the original polyester DTY in those properties;the recycled polyester DTY exhibited slightly poorer thermal stability,lower breaking strength and higher coefficient of variation in breaking strength and elongation at break,and the physically recycled polyester fiber possessed higher elongation at break as compared with the original polyester fiber;the chemically recycled polyester DTY had the similar crimp contraction,crimp stability and boiling water shrinkage with the original polyester DTY when the physically recycled polyester fiber was obviously lower in these properties.