The crystallization behaviors of acetylated bamboo fiber (BF)/polypropylene (PP) composites were assessed using differential scanning calorimetry (DSC) through isothermal crystallization. The transcrystalline (TC) morphologies of composites were observed through polarized optical microscopy (POM), and their surface free energies were calculated based on Hoffman‒Lauritzen theory. Isothermal DSC thermograms demonstrated that acetylated BF with higher weight percentage gains (WPGs, ~ 19%) exhibited a decreased crystallization rate of the PP matrix. POM images indicated that BF as a nucleation agent induced the TC layer on fiber–PP matrix interfaces. However, when WPG reached 19%, the TC layer was not observed on the BF surface and crystal growth was principally observed in the PP matrix bulk. Based on Hoffman‒Lauritzen theory, the folding-surface free energy (σ_e) and the work of chain folding (q) for acetylated BF/PP composites were estimated to be higher than those for PP composites with unmodified BF. These results indicate that BFs with different WPGs could affect the crystallization behavior of the PP matrix by inducing or hindering TC on BF–PP matrix interfaces.

使用差示扫描量热法（DSC）通过等温结晶来评估乙酰化竹纤维（BF）/聚丙烯（PP）复合材料的结晶行为。通过偏振光学显微镜（POM）观察复合材料的跨晶（TC）形态，并根据霍夫曼·劳里森理论计算其表面自由能。等温DSC热分析图表明，具有更高重量百分比增加（WPG，〜19％）的乙酰化高炉表现出降低的PP基质结晶速率。POM图像表明，作为成核剂的BF诱导了纤维-PP基体界面上的TC层。但是，当WPG达到19％时，在BF表面上未观察到TC层，并且主要在PP基体中观察到了晶体生长。根据霍夫曼·劳里森理论，σ _ë）和链折叠的工作（q）为乙酰化的BF / PP复合材料估计比那些PP复合材料与未改性的BF更高。这些结果表明，具有不同WPG的BF可以通过在BF-PP基质界面上诱导或阻碍TC来影响PP基质的结晶行为。