Cellulose nanocrystals (CNCs) were dispersed via solution casting in amorphous (A) and semi-crystalline (SC) poly (lactic acid) (PLA) and poly (butylene adipate-co-terephthalate) (PBAT). The protocol, optimized following the Hansen solubility parameter theory, relies on binary mixtures of tetrahydrofuran and dimethyl sulfoxide for the polymers and CNCs, respectively. First highlighted through atomic force microscopy, good filler dispersion and distribution were confirmed by a decrease of the linear viscoelastic region and significant increases of the complex viscosity, storage modulus, and apparent yield stress of the nanocomposites with CNC content, specifically at low frequencies. CNC percolation thresholds of 1, 0.3, and 0.3 wt% were determined in A-PLA, SC-PLA, and PBAT, respectively. These are the lowest to be reported in the literature until now. While PLA retained solvent traces, leading to a significant plasticizing effect, solvent removal was complete in PBAT. It was attributed to the crystallization of PBAT at the drying temperature (70 °C).

通过溶液流延将纤维素纳米晶体（CNC）分散在无定形（A）和半结晶（SC）的聚乳酸（PLA）和聚（己二酸丁二酯-对苯二甲酸丁二醇酯）（PBAT）中。该协议根据Hansen溶解度参数理论进行了优化，分别依赖于四氢呋喃和二甲基亚砜的二元混合物分别用于聚合物和CNC。首先通过原子力显微镜突出显示，良好的填料分散性和分布被线性粘弹性区域的减少以及复数粘度，储能模量和具有CNC含量的纳米复合材料的表观屈服应力的显着增加所证实，尤其是在低频下。在A-PLA，SC-PLA和PBAT中，CNC渗透阈分别确定为1、0.3和0.3 wt％。这些是迄今为止文献中最低的报道。尽管PLA保留了痕量溶剂，从而导致了显着的增塑效果，但在PBAT中溶剂去除已完成。这归因于在干燥温度（70°C）下PBAT的结晶。