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聚合物结晶一直以来是高分子凝聚态研究的热点,随着超临界流体尤其是超临界CO2(scCO2)在聚合物方面应用日益增加,对超临界条件下的聚合物结晶研究显得更加重要。scCO2在聚合物中溶解度较高,增塑效果好,能显著降低玻璃化温度(Tg)和熔点(Tm),改变聚合物的晶体形态,并对动力学过程产生较大影响。因此,聚合物在scCO2条件下结晶行为的深入研究,在实际应用中起着重要的指导作用。本文对scCO2作用下的链型、晶体形态、共混物特点和结晶动力学过程的研究现状进行综述。
Polymer crystallization has long been a hot topic in polymer condensation research. With the increasing application of supercritical fluid, especially supercritical carbon dioxide (SCCO2) in polymers, the study of polymer crystallization under supercritical conditions is even more important. The scCO2 has high solubility in polymer and good plasticizing effect, can significantly reduce the glass transition temperature (Tg) and melting point (Tm), change the crystal morphology of polymer, and have a great influence on the kinetic process. Therefore, in-depth study of the crystallization behavior of polymers under scCO2 conditions plays an important guiding role in practical application. In this paper, the current situation of scCO2-type chains, crystal morphology, blend characteristics and crystallization kinetics are reviewed.