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DONG Lisong, ZHENG Guodong, FENG Zhiliu. INVESTIGATION OF THE TRANSITIONS OF OLIGO-POLYSULFONES BY DSC*[J]. Chinese Journal of Polymer Science,
;1987, 5(3): 228-233.
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The transitions of bisphenol A and phenolphthalein o|igopolysulfones were investigated by DSC. It is found that both the oligomers have three transitions within the temperature range (230-550K) studied. Considering the strong dependence of the appearance of the two transitions, lower and higher than Tg, on the specimens' thermal history, i. e., temperature and time of heat-treatment, and their particular molecular strueture, it is proposed that these two transitions are morphological in origin arid are due to the disordering of relatively short range order of very small regions,and to the disordering of relatively well-ordered intra or/and intermolecular segments,respectively.Equations for linear relationship between Tg and 1/Mn for both the oligomers are given in the paper.
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