Polylactide (PLA) has attracted attention for use in the melt blowing process due to its ease of processing and biodegradation. However, the low mechanical property limits the practical application. In this work, in situ fibrillation technology was introduced to improve the mechanical properties of PLA-based melt-blown nonwovens. First, PLA/PBS blends with a sea–island morphology were prepared using a screw extruder. Then, the PBS droplets evolved into in situ fibrils under the action of elongational flow and transverse contraction in the die and airflow field. Benefiting from the in situ fibrous structure, the simultaneous enhancement in strength (2.19 MPa) and strain (12.97%) was achieved in the PLA-based melt-blown nonwovens, obtaining a substantial increase of 164 and 672%, respectively, compared to the pure PLA nonwovens. Moreover, the prepared nonwovens exhibited enhanced thermal properties and good wearing comfort performance. Overall, this study proposes a simple and promising method for preparing biodegradable melt-blown nonwovens with excellent mechanical properties.

中文翻译：

---

通过原位 PBS 原纤维形成来定制具有增强机械性能的生物可降解 PLA/PBS 熔喷非织造布的微观结构


聚丙交酯（PLA）由于其易于加工和生物降解而在熔喷工艺中的应用引起了人们的关注。但机械性能较低限制了实际应用。在这项工作中，引入原位原纤化技术来提高PLA基熔喷非织造布的机械性能。首先，使用螺杆挤出机制备具有海岛形态的 PLA/PBS 共混物。然后，PBS液滴在模头和气流场中的伸长流和横向收缩的作用下演化成原位原纤维。受益于原位纤维结构，PLA基熔喷非织造布实现了强度（2.19 MPa）和应变（12.97%）的同步增强，分别比普通熔喷非织造布大幅提高了164%和672%。纯PLA无纺布。此外，所制备的非织造布表现出增强的热性能和良好的穿着舒适性。总的来说，这项研究提出了一种简单而有前途的方法来制备具有优异机械性能的可生物降解熔喷非织造布。