Fenton法制备的纤维素纳米纤丝在聚乙烯醇复合膜中的应用研究

Application of Cellulose Nanofibril Prepared by Fenton Oxidized Method in Polyvinyl Alcohol Composite Films

利用Fenton试剂预处理溶解浆原料,高压均质后获得Fenton氧化纤维素纳米纤丝(Fenton Cellulose Nanofiber,F-CNF),随后采用溶液浇铸法制备了F-CNF添加量为1%~20%的F-CNF/PVA复合膜。通过扫描电子显微镜(SEM)、激光共聚焦显微镜(CLSM)、傅里叶变换红外光谱仪(FTIR)、万能力学实验机、溶胀实验、热重分析仪(TGA)等对复合膜的微观形貌、化学结构变化、力学性能、吸水溶胀性、热稳定性等进行了分析表征。结果表明,F-CNF与PVA分子间产生了大量的氢键缔合并发生了缩醛反应,两者具有良好的界面相容性,F-CNF可在PVA基质中均匀分散;添加F-CNF后,显著提高了复合膜的拉伸强度和弹性模量,降低了复合膜的吸水溶胀率,提高了其热稳定性。当F-CNF添加量为15%时,复合膜的拉伸强度为65.27 MPa,弹性模量为1460.32 MPa,与PVA膜相比,分别增加了217.77%和830.69%。

Fenton cellulose nanofibril(F-CNF)was prepared by using dissolving pulp Fenton oxidation with followed homogenization,and then F-CNF/PVA composite films with the additive amount of F-CNF ranging from 1%to 20%were prepared by solution pouring method.Scanning electron microscopy(SEM),confocal laser scanning microscope(CLSM),fourier transform infrared spectroscopy(FT-IR),uni⁃versal tensile testing machine,swelling property testing and thermogravimetric analysis were used to characterize the micromorphology,chemical structure,mechanical properties,hydroscopicity and thermal stability of the composites.The results showed that a large number of hydrogen bonds were formed between F-CNF and PVA molecules and the acetal reaction occurred.F-CNF uniformly dispersed in PVA ma⁃trix,and the two had good interfacial compatibility.After the addition of F-CNF,the tensile strength and elastic modulus of the composite films were significantly improved,the water absorption of the composite material was reduced,and its thermal stability was improved.When the amount of F-CNF was 15%,the tensile strength and young's modulus of the composite films were 65.27 MPa and 1460.32 MPa,respec⁃tively,which were 217.77%and 830.69%higher than those of pure PVA film.