It was demonstrated that some level of order exists in glassy poly(ethylene terephthalate) by depolarized light intensity(DLI) technique, but this order is different from that in crystalline PET. The degree of order i...It was demonstrated that some level of order exists in glassy poly(ethylene terephthalate) by depolarized light intensity(DLI) technique, but this order is different from that in crystalline PET. The degree of order in glassy PET decrease with increasing temperature between 288-343 K. The active energy of this transition is about 22 56 kJ/mol. The IR analysis indicated that this order relates to gauche structure of the ethyleneglycol fragments. The decrease of order with temperature comes from the increase of distance between the order segments.展开更多
基金supported by the National Key R&D Program of China (2018YFA0703600)the National Natural Science Foundation of China (51922102, 52001319, 52271158, 92163108, and 52231006)+2 种基金Zhejiang Provincial Natural Science Foundation (LGF22E010002, LZ22A030001, and LR22E010004)the “Pioneer and Leading Goose” R&D Program of Zhejiang (2022C01023)Ningbo Key Scientific and Technological Project (2019B10051)。
文摘It was demonstrated that some level of order exists in glassy poly(ethylene terephthalate) by depolarized light intensity(DLI) technique, but this order is different from that in crystalline PET. The degree of order in glassy PET decrease with increasing temperature between 288-343 K. The active energy of this transition is about 22 56 kJ/mol. The IR analysis indicated that this order relates to gauche structure of the ethyleneglycol fragments. The decrease of order with temperature comes from the increase of distance between the order segments.
