We report on a method for the preparation of cellulose/chitin composite materials from the ionic liquid 1-butyl-3-methylimidazolium acetate and γ-valerolactone as a biosourced sustainable co-solvent. Element analysis and attentuated total reflectance Fourier transform infrared spectroscopy show that the average degree of acetylation of chitin in the composite materials was around 82.5%. This indicates that chitin is not deacetylated to chitosan during the dissolution process. The X-ray diffraction results show that the degree of crystallinity of the composite materials increases from amorphous to 59% with increasing chitin concentration accompanied by a developing crystallite size up to 3 nm. Mechanical testing yielded a maximum tensile stress of 4.7 MPa, an elastic modulus of 27.4 MPa and a breaking elongation of 78.7% for the composites with 80 wt% chitin. In addition, water contact angle measurements indicated that the presence of chitin rendered the materials more hydrophobic.

我们报告了一种由离子液体乙酸1-丁基-3-甲基咪唑鎓乙酸盐和γ-戊内酯作为生物来源的可持续共溶剂制备纤维素/甲壳质复合材料的方法。元素分析和衰减全反射傅里叶变换红外光谱表明，复合材料中甲壳素的平均乙酰化度约为82.5％。这表明在溶解过程中几丁质没有被脱乙酰化为壳聚糖。X射线衍射结果表明，随着几丁质浓度的增加，伴随着直至3nm的微晶尺寸的发展，复合材料的结晶度从无定形增加到59％。机械测试产生的最大拉伸应力为4.7 MPa，弹性模量为27.4 MPa，断裂伸长率为78。对于具有80 wt％几丁质的复合材料，为7％。另外，水接触角的测量表明，几丁质的存在使材料更疏水。