期刊
CARBOHYDRATE POLYMERS
卷 259, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2021.117754
关键词
Cellulose acetate butyrate; Decomposition; Glass transition; Simultaneous
The study found that CAB does not have a melting point, but rather undergoes a chemically induced transition resulting in a glass transition along with mass loss. This phenomenon is termed as "glass chemical transition."
Cellulose acetate butyrate (CAB) belongs to cellulose esters, an important category of polymers, that are derived from the most abundant organic substance on earth (cellulose). As most cellulose esters, CAB is believed to exhibit a melting point. In this study, carefully selected experiments were performed, in order to test if the endothermic peak, observed in the Differential Scanning Calorimetry (DSC) scan of CAB, is a melting point. It was found that it is not a melting peak but a chemically induced transition (appearing as glass transition) occurring simultaneously with mass loss (decomposition and vaporization). For this phenomenon, the term ?glass chemical transition? is proposed. Various literature misinterpretations/confusions are clarified and the potential consequences of this discovery are shortly discussed. Based on literature data and the presented results, it seems almost certain that secondary cellulose esters exhibit this behavior. It is likely, that other polymers, also exhibit this peculiar thermal transition.
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