Deepa B, Abraham E, Cordeiro N, Faria M, Primc G, Pottathara Y, Leskovšek M, Gorjanc M, Mozetič M, Thomas S, Pothan L A
Department of Chemistry, C.M.S.College, Kottayam, 686001, Kerala, India.
Renewable and Sustainable Energy Institute, University of Colorado, Boulder, Colorado, 80309, USA.
Heliyon. 2020 Feb 3;6(2):e03266. doi: 10.1016/j.heliyon.2020.e03266. eCollection 2020 Feb.
To develop bio-nanocomposites using natural biopolymers, nanocomposite films were prepared based on sodium alginate and kapok nanofibrils (CNFs). CNFs when subjected to TEMPO-mediated oxidation gave rise to cellulose nanocrystals (TOCNCs), with carboxyl groups at the surface ( = 3.64). The differences between the two types of nanocelluloses (nanofibrils and nanocrystals) and their impact in the preparation of bio-nanocomposites, were studied. When incorporated in the matrix, the CNFs particles have the tendency to form surface aggregation ( = 2.37), distorting the alginate network, creating heterogeneous films, with high surface roughness ( = 29.37 nm), porosity ( = 0.087 cm/min) and vulnerability to heat. The TOCNCs present good dispersion creating a 3D network, which forms uniform ( = 0.122 cm/min) and homogeneous films, with smooth surface ( = 16.83 nm). The ultrasonication treatment facilitated the dispersion improving the interfacial interaction between the reinforcing phase and the matrix. The results show the reinforcement potential of kapok nanocellulose in an industrially and medically important biopolymer, sodium alginate, especially when TOCNCs and ultrasonication were used.
为了使用天然生物聚合物开发生物纳米复合材料，基于海藻酸钠和木棉纳米纤维（CNFs）制备了纳米复合薄膜。CNFs在经TEMPO介导的氧化后产生纤维素纳米晶体（TOCNCs），其表面带有羧基（= 3.64）。研究了两种类型的纳米纤维素（纳米纤维和纳米晶体）之间的差异及其在生物纳米复合材料制备中的影响。当CNFs颗粒掺入基质中时，它们倾向于形成表面聚集（= 2.37），扭曲海藻酸盐网络，形成具有高表面粗糙度（= 29.37 nm）、孔隙率（= 0.087 cm/min）且易受热影响的异质薄膜。TOCNCs具有良好的分散性，形成三维网络，从而形成均匀（= 0.122 cm/min）且均质的薄膜，表面光滑（= 16.83 nm）。超声处理促进了分散，改善了增强相和基质之间的界面相互作用。结果表明，木棉纳米纤维素在工业和医学上重要的生物聚合物海藻酸钠中具有增强潜力，特别是在使用TOCNCs和超声处理时。
