【摘要】 使用成核剂癸二酸二苯基二酰肼（ST-NAB3）调控扩链剂苯乙烯-丙烯腈-甲基丙烯酸缩水甘油酯（SAG）改性聚乳酸（PLA）化学接枝产物（C-PLA）的性能，并采用超临界CO₂制备了C-PLA-ST-NAB3发泡材料。利用偏振光学显微镜和差示扫描量热仪（DSC）、旋转流变仪、扫描电子显微镜（SEM）分别研究了不同ST-NAB3含量的C-PLA结晶性能、热性能、流变性能和发泡材料的微观结构。结果表明，ST-NAB3的加入能够显著提高C-PLA的结晶速率，减小晶体尺寸，同时增大晶体密度。随着ST-NAB3含量的增加，C-PLA的结晶度由3.2%提高到20.2%，其含量为0.3%（质量分数，下同）和0.4%时，在不同发泡温度下均能制得泡孔尺寸均一的C-PLA-ST-NAB3发泡材料。更多还原

【Abstract】 In this study,diphenylhydrazide sebacic acid （ST-NAB3） was used to regulate the properties of a chemical graft product （C-PLA） obtained from the chain-extension modification of polylactic acid （PLA） using styrene-acrylonitrile-glycidyl methacrylate （SAG） a chain extender.Then,C-PLA-ST-NAB3 foams were prepared by using supercritical CO₂,and their crystallization performance,thermal performance,rheological behavior,foaming properties,and microstructure were investigated by polarization light microscopy,differential scanning calorimetry,rotational rheometer,and scanning electron microscopy.The results indicated that the addition of ST-NAB3 increased the crystallization rate of C-PLA foams significantly,resulting in a reduction in the crystal size but an increase in the crystal density.With an increase in the ST-NAB3 content,the crystallinity degree of the C-PLA foam increased from 3.2%to 20.2%.When the content of ST-NAB3 was 0.3 and 0.4 wt%,the C-PLA-ST-NAB3 foams with a uniform cell size could be formed at different foaming temperature.更多还原