不同长径比PET纤维对纸基复合材料强度性能的影响

Mechanical Properties of Cellulose-based Composites Reinforced by PET Fibers with Various Aspect Ratios

关键词:  PET纤维  纸基复合材料  长径比  力学性能

Key Words:PET fibers  cellulose-based composites  aspect ratios  mechanical properties

摘要:采用不同长径比的聚对苯二甲酸乙二醇酯（PET）纤维与棉浆纤维混合成形，通过水相复配，利用氢键作用和机械交织力制备纸基复合材料。借助PET纤维的刚性和优异的力学性能增强纸基复合材料的强度性能。结果表明，在不同长径比PET纤维中，PET-c的屈服强度最高，为300.99 MPa，其长径比为392.16，近似为棉浆纤维长径比的10倍；PET纤维对纸基复合材料的强度性能有明显提升作用，其中当PET-c的用量为10%时，纸基复合材料的撕裂度、抗张强度、耐折度分别提高42.11%、31.05%、21.85%。纸张拉伸或耐折断裂面扫描电子显微镜（SEM）图显示，PET纤维没有发生断裂或折断，而是被抽出或弯折，表明在受到外力破坏时，PET纤维能够增强纸基复合材料的强度，对纸基复合材料起到有效的保护作用。

Abstract:In this work, cellulose-based composites was prepared by wet forming process, and polyethylene terephthalate （PET） fibers with various aspect ratios were blended for enhancing the mechanical properties of the sheet by the aid of PET fibers inherent strength. The results showed that the aspect ratio of PET-c fiber was 392.16, proximately 10 times that of cellulose fiber, the yield strength of PET-c fiber was the highest, 300.99 MPa among the PET fibers with various aspect ratio. The mechanical properties of the cellulose-based composites containing PET fibers furnish were dramatically improved. When PET-c fibers were applied at 10%, the tensile, tearing and flexural strength of the composites increased by 42.11%, 31.05% and 21.85%, respectively. The scanning electron microscopy （SEM） images of the paper fracture surface in tensile and folding experiments showed that there were no broken or splitter PET fibers, the PET fibers only were pulled out or in bending state. It indicated that PET fibers could play an effective protective role on cellulose fibers from damage by external force.