高透明羧甲基纤维素/纤维素纤维复合薄膜的制备及其力学性能

针对传统电子器件衬底柔韧性差、不可生物降解的问题，研究了以羧甲基纤维素（CMC）和纤维素纤维为原料，结合抄纸和浸渍工艺，制备在柔性电子器件领域具有潜在应用的高透明CMC/纤维素纤维复合薄膜衬底。分别探究了CMC与北木纤维的配比和CMC分子量对薄膜透明度和力学性能的影响。研究了纤维素纤维的种类（北木、桉木、马尼拉麻和蔗渣纤维）对高透明CMC/纤维素纤维复合薄膜力学性能的影响。结果表明：CMC与北木纤维质量比为7∶3、CMC分子量为700 000时，所制备CMC/北木纤维复合薄膜的透明度为90%，拉伸强度约为111 MPa，耐折度达到2 526次。这种可生物降解、高柔韧性、高强度和高透明的CMC/纤维素纤维复合薄膜有望作为衬底用于构建下一代绿色、柔性电子器件，促进人类社会的可持续发展。

Preparation and mechanical properties of highly transparent carboxymethyl cellulose/cellulose fiber composite films

A highly transparent carboxymethyl cellulose (CMC)/cellulose fiber composite film based on cellulose fibers and CMC was rapidly prepared by a combination of paper making method and impregnation, aiming to replace current rigid, non-biodegradable substrates for electronic devices. The optical transmittance of composite films as function of the mass ratio of CMC to northern wood fibers and the influence of the CMC molecular weight on the mechanical properties were investigated.The effect of fiber species (northern wood fiber, eucalyptus wood fiber, manila hemp fiber, bagasse fiber) on the mechanical properties of highly transparent CMC/cellulose fiber composite films was also studied. The results show that the CMC/northern wood fiber composite film exhibits a light transmittance of 90%, a tensile strength of 111 MPa, and a folding endurance up to 2 526 times when the mass ratio of CMC (molecular weight:700 000)to softwood fibers is 7:3. This biodegradable, mechanically flexible, strong, and highly transparent CMC/cellulose fiber composite film shows the potential to be used in the fabrication of next generation flexible and green electronic devices as a substrate to maintain the sustainability of human's society.