Electrospun Poly(lactic acid)-Based Fibrous Nanocomposite Reinforced by Cellulose Nanocrystals: Impact of Fiber Uniaxial Alignment on Microstructure and Mechanical Properties,Biomacromolecules

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Electrospun Poly(lactic acid)-Based Fibrous Nanocomposite Reinforced by Cellulose Nanocrystals: Impact of Fiber Uniaxial Alignment on Microstructure and Mechanical Properties
Biomacromolecules ( IF 5.5 ) Pub Date : 2018-02-14 00:00:00 , DOI: 10.1021/acs.biomac.8b00023
Siqi Huan ₁ , Guoxiang Liu ₁ , Wanli Cheng ₁ , Guangping Han ₁ , Long Bai ₁

Affiliation

Uniform poly(lactic acid)/cellulose nanocrystal (PLA/CNC) fibrous mats composed of either random or aligned fibers reinforced with up to 20 wt % CNCs were successfully produced by two different electrospinning processes. Various concentrations of CNCs could be stably dispersed in PLA solution prior to fiber manufacture. The microstructure of produced fibrous mats, regardless of random or aligned orientation, was transformed from smooth to nanoporous surface by changing CNC loading levels. Aligning process through secondary stretching during high-speed collection can also affect the porous structure of fibers. With the same CNC loading, fibrous mats produced with aligned fibers had higher degree of crystallinity than that of fibers with random structure. The thermal properties and mechanical performances of PLA/CNC fibrous mats can be enhanced, showing better enhancement effect of aligned fibrous structure. This results from a synergistic effect of the increased crystallinity of fibers, the efficient stress transfer from PLA to CNCs, and the ordered arrangement of electrospun fibers in the mats. This research paves a way for developing an electrospinning system that can manufacture high-performance CNC-enhanced PLA fibrous nanocomposites.

中文翻译：

纤维素纳米晶体增强的电纺聚乳酸纤维纳米复合材料：纤维单轴排列对微观结构和力学性能的影响

通过两种不同的静电纺丝工艺成功地生产了由无规或取向纤维组成的均匀聚（乳酸）/纤维素纳米晶体（PLA / CNC）纤维毡，并用高达20 wt％的CNCs进行了增强。在制造纤维之前，可以将各种浓度的CNCs稳定地分散在PLA溶液中。通过改变CNC负载水平，可以将生产的纤维毡的微观结构，无论是随机排列还是对齐排列，都从光滑的表面转变为纳米多孔的表面。在高速收集过程中通过二次拉伸进行的对齐过程也会影响纤维的多孔结构。在相同的CNC载荷下，由排列的纤维制成的纤维毡的结晶度要比具有随机结构的纤维的结晶度高。可以提高PLA / CNC纤维毡的热性能和机械性能，显示出更好的排列纤维结构增强效果。这是由于纤维的结晶度提高，从PLA到CNC的有效应力转移以及垫中电纺纤维的有序排列产生的协同效应。这项研究为开发可生产高性能CNC增强的PLA纤维纳米复合材料的静电纺丝系统铺平了道路。

更新日期：2018-02-14

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