The effects of fibre orientation and laminate stacking sequence on the mechanical anisotropy of paper-based all-cellulose composites produced via a partial dissolution route is examined. As part of this work, the fibre architecture and microstructure of the paper precursor is controlled and characterised in order to follow the anisotropy of the materials through from precursor to final composite material. The fibre orientation of the precursor was found to strongly influence the mechanical anisotropy of the final composite material. The ultimate tensile strength and Young’s modulus of the paper-based all-cellulose composite laminates was 191 MPa and 17.5 GPa in the fibre direction, respectively, compared with 104 MPa and 10.4 GPa in the transverse direction, respectively. The ACC crystal structure was assessed with powder and transmission mode Wide-angle X-ray diffraction (WAXD) to measure the changes in crystallinity and crystal orientation due to the dissolution process. The mechanical response of multi-axial all-cellulose composite laminates was also determined experimentally and compared with analytical predictions by Classical Lamination Theory, demonstrating the utility of CLT for the prediction of the elastic properties of ACC laminates.

纤维取向和层压堆叠序列对的机械各向异性的影响纸基产生全纤维素复合经由检查了部分溶解途径。作为这项工作的一部分，对纸质前驱体的纤维结构和微观结构进行控制和表征，以便跟踪材料的各向异性，从前驱体到最终复合材料。发现前体的纤维取向强烈影响最终复合材料的机械各向异性。纸基全纤维素复合层压材料的极限拉伸强度和杨氏模量在纤维方向上分别为191 MPa和17.5 GPa，而横向上分别为104 MPa和10.4 GPa。通过粉末和透射模式的广角X射线衍射（WAXD）评估了ACC晶体的结构，以测量由于溶解过程而引起的结晶度和晶体取向的变化。