López de Dicastillo Carol, Garrido Luan, Alvarado Nancy, Romero Julio, Palma Juan Luis, Galotto Maria Jose
Food Packaging Laboratory (Laben-Chile), Department of Science and Food Technology, Faculty of Technology, Center for the Development of Nanoscience and Nanotechnology (CEDENNA), Universidad de Santiago de Chile (USACH), Obispo Umaña 050, 9170201 Santiago, Chile.
Laboratory of Membrane Separation Processes (LABPROSEM), Engineering Faculty, University of Santiago de Chile (USACH), Obispo Umaña 050, 9170201 Santiago, Chile.
Nanomaterials (Basel). 2017 May 11;7(5):106. doi: 10.3390/nano7050106.
Electrospun nanofibers of poly (vinyl alcohol) (PV) were obtained to improve dispersion of cellulose nanocrystals (CNC) within hydrophobic biopolymeric matrices, such as poly(lactic acid) (PLA). Electrospun nanofibers (PV/CNC) were successfully obtained with a final concentration of 23% (/) of CNC. Morphological, structural and thermal properties of developed CNC and electrospun nanofibers were characterized. X-ray diffraction and thermal analysis revealed that the crystallinity of PV was reduced by the electrospinning process, and the incorporation of CNC increased the thermal stability of biodegradable nanofibers. Interactions between CNC and PV polymer also enhanced the thermal stability of CNC and improved the dispersion of CNC within the PLA matrix. PLA materials with CNC lyophilized were also casted in order to compare the properties with materials based on CNC containing nanofibers. Nanofibers and CNC were incorporated into PLA at three concentrations: 0.5%, 1% and 3% (CNC respect to polymer weight) and nanocomposites were fully characterized. Overall, nanofibers containing CNC positively modified the physical properties of PLA materials, such as the crystallinity degree of PLA which was greatly enhanced. Specifically, materials with 1% nanofiber 1PLA(PV/CNC) presented highest improvements related to mechanical and barrier properties; elongation at break was enhanced almost four times and the permeation of oxygen was reduced by approximately 30%.
制备了聚（乙烯醇）（PV）的电纺纳米纤维，以改善纤维素纳米晶体（CNC）在疏水性生物聚合物基质（如聚乳酸（PLA））中的分散性。成功制备了最终浓度为23%（/）的CNC的电纺纳米纤维（PV/CNC）。对所制备的CNC和电纺纳米纤维的形态、结构和热性能进行了表征。X射线衍射和热分析表明，电纺过程降低了PV的结晶度，而CNC的加入提高了可生物降解纳米纤维的热稳定性。CNC与PV聚合物之间的相互作用也提高了CNC的热稳定性，并改善了CNC在PLA基质中的分散性。还浇铸了冻干的含CNC的PLA材料，以便与基于含CNC纳米纤维的材料的性能进行比较。将纳米纤维和CNC以三种浓度（相对于聚合物重量的0.5%、1%和3%的CNC）掺入PLA中，并对纳米复合材料进行了全面表征。总体而言，含CNC的纳米纤维对PLA材料的物理性能有积极影响，比如大大提高了PLA的结晶度。具体来说，含1%纳米纤维的1PLA（PV/CNC）材料在机械性能和阻隔性能方面有最大改善；断裂伸长率提高了近四倍，氧气渗透率降低了约30%。
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