Research and Application of PET Gel Permeation Chromatography with HFIP as Mobile Phase
The relative molecular mass and its distribution of polyethylene terephthalate(PET)are key parameters affecting its polymerization and processing technology.Based on the characteristic that hexafluoroisopropanol(HFIP)can dissolve most polyester polymers,the relative molecular mass and its distribution of PET were measured by using HFIP as the mobile phase of gel permeation chromatography.The calibration curves were established by narrow standard samples of poly(methyl methacrylate)(PMMA).The relative molecular mass and its distribution were measured at different dissolution temperatures and time,and the relative standard deviation(RSD)was analyzed.The results show that the optimal dissolution scheme for PET is a dissolution temperature of 20℃and a dissolution time of 8 h.Drying contrast experiment show that HFIP dissolves PET without drying treatment,and the dissolution conditions are mild,which can avoid PET degradation caused by insufficient drying and high dissolution temperature.Under the conventional PET polymerization conditions,the relative molecular mass of PET increases slowly after high vacuum polymerization for more than two hours.Different polymerization kettles and polymerization processes will lead to differences in the relative molecular mass distribution of PET,and the relative molecular mass distribution of PET obviously affects the temperature setting of melt spinning process.
Gel permeation chromatographyHexafluoroisopropanolRelative molecular massPolymerization process
万方数据
维普
