Osolnik Urša, Vek Viljem, Humar Miha, Oven Primož, Poljanšek Ida
Department of Wood Science and Technology, Biotechnical Faculty, University of Ljubljana, Jamnikarjeva 101, 1000 Ljubljana, Slovenia.
Polymers (Basel). 2024 Dec 25;17(1):16. doi: 10.3390/polym17010016.
This study compared the use of cellulose nanofibrils (CNF) and lignocellulose nanofibrils (LCNF) in different concentrations to reinforce the poly(vinyl alcohol) (PVA) matrix. Both nanofillers significantly improved the elastic modulus and tensile strength of PVA biocomposite films. The optimum concentration of CNF and LCNF was 6% relative to PVA, which improved the tensile strength of the final PVA biocomposite with CNF and LCNF by 53% and 39%, respectively, compared to the neat PVA film. The addition of LCNF resulted in more elastic films than the addition of CNF to the PVA matrix. The elongation at break of the PVA biocomposite with 2% of LCNF was more than 100% higher than that of the neat PVA film. The integration of tannic acid (TA) into the PVA-LCNF system resulted in antioxidant-active and more water-resistant PVA biocomposites. The three-component biocomposite films with 2 and 6% LCNF and 10% TA exhibited a more than 20° higher contact angle of the water droplet on the surfaces of the biocomposite films and absorbed more than 50% less water than the neat PVA film. New formulations of biocomposite films have been developed with the addition of LCNF and TA in a polymeric PVA matrix.
本研究比较了不同浓度的纤维素纳米纤维（CNF）和木质纤维素纳米纤维（LCNF）对聚乙烯醇（PVA）基体的增强作用。两种纳米填料均显著提高了PVA生物复合膜的弹性模量和拉伸强度。相对于PVA，CNF和LCNF的最佳浓度均为6%，与纯PVA膜相比，添加CNF和LCNF的最终PVA生物复合材料的拉伸强度分别提高了53%和39%。与向PVA基体中添加CNF相比，添加LCNF可使薄膜更具弹性。含2%LCNF的PVA生物复合材料的断裂伸长率比纯PVA膜高出100%以上。将单宁酸（TA）引入PVA-LCNF体系可得到具有抗氧化活性且更耐水的PVA生物复合材料。含2%和6%LCNF以及10%TA的三元生物复合膜表面水滴的接触角比纯PVA膜高出20°以上，吸水量比纯PVA膜少50%以上。通过在聚合物PVA基体中添加LCNF和TA，开发出了新型生物复合膜配方。
