University of Ljubljana, Faculty of Chemistry and Chemical Technology, Večna pot 113, 1000, Ljubljana, Slovenia.
University of Trieste, Engineering and Architecture Department, Piazzale Europa, I-34127, Trieste, Italy.
Carbohydr Polym. 2020 Jul 15;240:116330. doi: 10.1016/j.carbpol.2020.116330. Epub 2020 Apr 21.
The viscoelastic and flow properties of aqueous Laponite/TEMPO-oxidized nanofibrillated cellulose (TEMPO-NFC) systems are investigated with the aim to study the effect of content and proportion of both components on the properties. Both Laponite and TEMPO-NFC aqueous dispersions can find numerous applications in different fields (from industrial to biomedical one) due to their structural and rheological properties. The most important effects of blending are observed at low Laponite fractions, also with qualitative changes in the shape of the flow curves and mechanical spectra. Positive synergistic effects are ascribed to the interpenetration and electrostatic interactions between TEMPO-NFC fibrils and Laponite nanodisks. These mechanisms are more effective in Laponite-poor blends when a minority of clay nanoparticles and its aggregated forms are distributed within the nanocellulose matrix, acting as bridging agents between polymer nanofibrils. The synergistic effects are compared to those observed for Laponite blends with a nonionic biopolymer, scleroglucan.
研究了水基 Laponite/TEMPO 氧化纳米原纤纤维素（TEMPO-NFC）体系的黏弹性和流变性，旨在研究两种成分的含量和比例对性能的影响。由于其结构和流变性能，Laponite 和 TEMPO-NFC 水基分散体在不同领域（从工业到生物医学领域）都有许多应用。混合的最重要影响发生在低 Laponite 分数下，流曲线和机械谱的形状也发生了定性变化。将 TEMPO-NFC 原纤和 Laponite 纳米盘之间的互穿和静电相互作用归因于正协同效应。当少数粘土纳米颗粒及其聚集形式分布在纳米纤维素基质中，充当聚合物纳米纤维之间的桥接剂时，这些机制在 Laponite 贫混合物中更为有效。将协同效应与与非离子生物聚合物，葡聚糖凝胶的 Laponite 混合物进行了比较。
