Thermal properties of water-soluble polyester

In order to provide parameters for spinning processing of water-soluble polyester(WSP),the melting point,thermal stability,rheological property of WSP were characterized by differential scanning calorimetry(DSC),thermo-gravimetric analysis(TGA),and rheometer,melting index analysis(MI).The results showed that compared with the common polyester(PET),the crystallization performance of the WSP was destroyed seriously,the melting point dropped remarkably,its thermal stability is very good below 350 ℃,however above 350 ℃ its weight loss is obvious quicker than that of PET.The shear viscosity of WSP is higher than that of PET when shear rate and temperature are the same.The apparent viscosity of WSP is decreased with increasing of temperature and pressure,but its change tendency along with temperature and pressure is weakening when the temperature reaches to 270 ℃.