期刊
EUROPEAN POLYMER JOURNAL
卷 94, 期 -, 页码 384-391出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.eurpolymj.2017.07.025
关键词
Polymer crystallization; Poly(butylene succinate); Thermal analysis
Low-temperature crystallization of poly(butylene succinate) (PBS) was investigated by conventional and temperature-modulated differential scanning calorimetry (DSC and TMDSC). After completion of primary crystallization, cooling of semicrystalline PBS to temperatures near or even below the glass transition temperature (T-g) leads to additional crystal growth. Such crystallization below T-g is identified by detection of frequency- and time-dependent reversing heat-capacity in non-isothermal and quasi-isothermal TMDSC analyses, respectively. Moreover, crystallization in the glassy state causes a shift of Tg to higher temperatures, thus affecting the properties of the amorphous phase. Low-temperature crystallization of amorphous PBS was re candy reported in the literature and linked to completion of enthalpy relaxation of the PBS glass. In the present study, low-temperature crystallization has been shown to occur also in semi crystalline PBS, with low temperature crystallization probably involving constrained amorphous segments already coupled with the crystals.
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