Effects of the Environmental Temperature on the Hot-Humid Aging of Degradable Polyester Films
The durability of degradable polyester films affects their designs and applications.However,the development cycle of the films with hot-humid aging resistant is long in the ordinary environment,so it is necessary to accelerate the hot-humid aging process to reduce the development costs.However,the specific relationships between the environmental temperature and hot-humid aging rate are still unclear.In this work,the specific influences of temperature on the hot-humid degradation processes of degradable polyester films were studied.The results show that the toughness failure times of polyester films tend to increase exponentially in the same temperature gradient interval,but the changes of film strengths have no obvious law.Taking the toughness failure as the termination point,the Arrhenius model was used to fit the temperature and toughness failure time.The activation energy of polylactic acid is 84.4 kJ/mol,and that of polylactic acid/polybutylene adipate terephthalate is 144.88 kJ/mol.The fitting results were reviewed and predicted at 77 and 70℃,and the toughness failure time of the film could be predicted successfully on the whole.For the developments of the films with hot-humid aging resistant,this work pointed out the sensitive performance indexes(elongation at break,enthalpy of secondary heating,etc.),providing a certain theoretical basis for the applications of the accelerating hot-humid aging process.
万方数据
维普
