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

关键词:  纤维素纳米纤丝  聚乙烯醇  复合膜  Fenton试剂

Key Words:cellulose nanofibril  polyvinyl alcohol  composite films  Fenton oxidation

摘要: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（FT-IR）、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%。

Abstract: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）， universal 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 matrix， 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， respectively， which were 217.77% and 830.69% higher than those of pure PVA film.