Thermoplastic "all-cellulose" composites were synthesized by covalent functionalization of cellulose acetate (CA) with oxidized carbonized cellulose (OCC). The OCC were manufactured via microwave-assisted hydrothermal carbonization (HTC) of cellulose followed by oxidation and dialysis. The OCC were of micrometer-size, had plane morphology and contained a variety of oxygen functionalities, enabling transformation into acyl chlorinated OCC under moderate reaction conditions. The synthesis of OCC-modified CA composites and neat CA were performed in the recyclable ionic liquid 1-allyl-3-methylimidazolium chloride. The degree of acetylation and amount of OCC were varied to establish their influence on thermal and physical properties of the composites. The OCC-modified CA composites displayed a notably enhanced film-forming ability, which led to improved optical and mechanical properties compared to neat CA. In addition, it was shown that OCC-modified CA composites can be synthesized from waste products, such as paper tissues. The OCC-modification was demonstrated to be a promising route to transparent and strong thermoplastic "all-cellulose" composites with moderate flexibility.

中文翻译：

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具有共价连接的碳化纤维素的热塑性“全纤维素”复合材料。

热塑性“全纤维素”复合材料是通过醋酸纤维素（CA）与氧化碳化纤维素（OCC）的共价官能化合成的。OCC通过纤维素的微波辅助水热碳化（HTC），然后进行氧化和渗析来制造。OCC的尺寸为微米级，具有平面形态，并且包含多种氧官能团，因此可以在中等反应条件下转化为酰基氯OCC。OCC改性的CA复合材料和纯净CA的合成是在可回收的离子液体1-烯丙基-3-甲基咪唑鎓氯化物中进行的。改变乙酰化程度和OCC的量以建立它们对复合材料的热和物理性能的影响。OCC改性的CA复合材料显示出显着增强的成膜能力，与纯净的CA相比，这改善了光学和机械性能。另外，已经表明，OCC-改性的CA复合材料可以由诸如纸巾的废品合成。事实证明，OCC改性是制备具有中等柔韧性的透明，坚固的热塑性“全纤维素”复合材料的有前途的途径。