Realization of structural manipulation in stereocomplex (sc) polylactic acid holds the key to fully leverage its surpassing performance, such as heat resistance and mechanical properties. In this study, we investigated the evolution of crystalline morphology/structure of equimolar racemic blends under the quantitative shear field modulated by the pulling speed of glass fiber (GF). Shear-induced crystallization proceeded above the melting point of homocrystals, allowing the exclusive formation of sc crystallites. Compared to sparse nuclei dispersed around the static GF with no nucleation activity, numerous oriented sc row-nuclei appeared on the surface of pulled GF. With the rise of shear rate up to 160 s⁻¹, the number of row-nuclei was boosted prominently. As a result, interfacial sc cylindrites were fostered due to the preferential radial growth of lamellae outwards the GF axis. The integrity and contour of sc cylindrites could be regulated by the number of sc precursors and thus shear rate. Attractively, the conspicuous enhancement of interfacial adhesion and solvent resistance was attained by the presence of robust sc cylindrites. As confirmed by the single-fiber pull-out test, interfacial strength of the sheared sample (160 s⁻¹) was over three times as large as that of the quiescent counterpart. Besides, the distortion due to the chloroform attack was significantly retarded for the film containing sc cylindrites in contrast to sc spherulites and homocrystal cylindrites. The current effort offers valuable instruction to fabricate the sc-PLA products with tailored crystalline morphology/structure.

立体复合（sc）聚乳酸中结构操纵的实现是充分利用其卓越性能（如耐热性和机械性能）的关键。在这项研究中，我们研究了等摩尔外消旋共混物的结晶形态/结构在玻璃纤维（GF）的拉动速度调节下的定量剪切场下的演化。剪切诱导的结晶在均晶的熔点以上进行，从而允许独家形成sc晶体。与分散在静态GF周围且没有成核活性的稀疏核相比，在拉动GF的表面上出现了许多定向的sc行核。随着剪切速率的上升高达160 s ^-1，行核数显着增加。结果，由于薄片在GF轴外侧的优先径向生长，促进了界面鳞状圆柱体的生长。sc柱状圆柱体的完整性和轮廓可以通过sc前体的数量和剪切速率来调节。有吸引力的是，通过存在强健的scylindrites，可以实现界面粘合性和耐溶剂性的显着提高。如单纤维拉出试验所证实的，剪切样品的界面强度（160 s ^-1）的大小是静态副本的三倍。此外，与sc球晶和均晶圆柱体相比，含有scylindrites的膜由于氯仿侵蚀引起的变形被显着地抑制了。当前的努力为制造具有定制的晶体形态/结构的sc-PLA产品提供了有价值的指导。