Chen Pei, Xie Fengwei, Tang Fengzai, McNally Tony
College of Food Science, South China Agricultural University, Guangzhou 510642, China.
International Institute for Nanocomposites Manufacturing (IINM), WMG, University of Warwick, Coventry CV4 7AL, UK.
Polymers (Basel). 2021 Feb 14;13(4):571. doi: 10.3390/polym13040571.
Cellulose nanocrystals (CNCs) and/or sepiolite (SPT) were thermomechanically mixed with un-plasticised chitosan and chitosan/carboxymethyl cellulose (CMC) blends plasticised with 1-ethyl-3-methylimidazolium acetate ([Cmim][OAc]). Examination of the morphology of these materials indicates that SPT aggregates were reduced when CNCs or [Cmim][OAc] were present. Inclusion of CNCs and/or SPT had a greater effect on material properties when the matrices were un-plasticised. Addition of SPT or CNCs altered the crystalline structure of the un-plasticised chitosan matrix. Moreover, a combination of SPT and CNCs was more effective at suppressing re-crystallisation. Nonetheless, the mechanical properties and surface hydrophobicity were more related to CNC/SPT-biopolymer interactions. The un-plasticised bionanocomposites generally showed increased relaxation temperatures, enhanced tensile strength, and reduced surface wettability. For the [Cmim][OAc] plasticised matrices, the ionic liquid (IL) dominates the interactions with the biopolymers such that the effect of the nanofillers is diminished. However, for the [Cmim][OAc] plasticised chitosan/CMC matrix, CNCs and SPT acted synergistically suppressing re-crystallisation but resulting in increased tensile strength.
将纤维素纳米晶体（CNCs）和/或海泡石（SPT）与未增塑的壳聚糖以及用乙酸1-乙基-3-甲基咪唑鎓（[Cmim][OAc]）增塑的壳聚糖/羧甲基纤维素（CMC）共混物进行热机械混合。对这些材料的形态学研究表明，当存在CNCs或[Cmim][OAc]时，SPT聚集体减少。当基质未增塑时，加入CNCs和/或SPT对材料性能有更大影响。添加SPT或CNCs改变了未增塑壳聚糖基质的晶体结构。此外，SPT和CNCs的组合在抑制再结晶方面更有效。尽管如此，机械性能和表面疏水性与CNC/SPT-生物聚合物相互作用的关系更大。未增塑的生物纳米复合材料通常表现出更高的松弛温度、增强的拉伸强度和降低的表面润湿性。对于用[Cmim][OAc]增塑的基质，离子液体（IL）主导了与生物聚合物的相互作用，使得纳米填料的效果减弱。然而，对于用[Cmim][OAc]增塑的壳聚糖/CMC基质，CNCs和SPT协同作用抑制再结晶，但导致拉伸强度增加。
