The effects of cellulose nanowhiskers on electrospun poly (lactic acid) nanofibres
The effects of cellulose nanowhiskers on electrospun poly (lactic acid) nanofibres
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DOI：
10.1007/s10853-011-6150-z
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发表时间：
2012-04
影响因子：
4.5
通讯作者：
Dongyan Liu;Xiaowen Yuan;D. Bhattacharyya
中科院分区：
文献类型：
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作者：
Dongyan Liu;Xiaowen Yuan;D. Bhattacharyya
本研究研究了纤维素纳米晶须对电纺聚乳酸（PLA）纳米纤维的微观结构和热行为的影响。通过静电纺丝纤维素晶须与PLA溶液的混合物，成功制备了PLA/纤维素纳米晶须复合纳米纤维。 PLA 及其复合材料的直径约为 300 nm。扫描电子显微照片显示纤维素纳米晶须没有突出到 PLA 纳米纤维的外表面。通过X射线衍射研究了电纺PLA基体纳米纤维中纤维素纳米晶须的存在及其微观结构的演变，傅里叶变换红外光谱（FTIR）分析显示了添加纤维素纳米晶须后PLA α晶体的形成趋势。由于PLA的快速溶剂蒸发和相对缓慢的结晶动力学特性，电纺PLA和PLA/纤维素纳米晶须复合材料表现出非常低的结晶度。电纺纳米纤维表现出与溶液流延薄膜特别不同的热行为。纯 PLA 和 PLA/纤维素纳米晶须的纳米纤维经历两个连续重叠的结晶过程。通过降低冷结晶起始温度，纤维素纳米晶须充当 PLA 成核的异质位点。将纤维素纳米晶须掺入 PLA 纳米纤维中有望改善机械性能并为电纺基质纳米纤维带来新的功能。
The effects of cellulose nanowhiskers on the microstructure and thermal behaviour of electrospun poly (lactic acid) (PLA) nanofibres have been investigated in this study. The PLA/cellulose nanowhiskers composite nanofibres are successfully produced by electrospinning the mixtures of cellulose whiskers with PLA solution. The diameters of PLA and its composites are around 300 nm. The scanning electron micrographs show that the cellulose nanowhiskers do not protrude out of the outer surfaces of PLA nanofibres. The existence of cellulose nanowhiskers in the electrospun PLA matrix nanofibres, and the microstructural evolution are investigated by using X-ray diffraction, Fourier transform infrared spectroscopy (FTIR) analysis shows the formation trend of PLA α crystal with the addition of cellulose nanowhiskers. The electrospun PLA and PLA/cellulose nanowhiskers composites reveal very low crystallinity due to the rapid solvent evaporation and relatively slow crystallisation kinetics character of PLA. The electrospun nanofibres show particularly different thermal behaviour from that of the solution cast films. The nanofibres of pure PLA and PLA/cellulose nanowhiskers experience two consecutively overlapping crystallisation processes. The cellulose nanowhiskers act as heterogeneous sites for nucleation of PLA by decreasing the cold crystallisation onset temperature. The incorporation of cellulose nanowhiskers into PLA nanofibres is expected to improve mechanical properties and bring new functionalities to the electrospun matrix nanofibres.