纳米纤维素/AESO聚合体系的制备及改善纸张水蒸气阻隔性能的研究

Cellulosic fibers based paper products are widely used in packaging industry as biodegradable materials. However, the hydrophilic nature and porous structures make paper a poor barrier for water vapor, which limits the use of paper in food and pharmaceutical packaging for high barrier application. Conventional approaches for improving the water vapor barrier property of paper are facing significant challenges due to sophisticated processing and recycling problems. It is necessary to develop a new kind of paper packaging material which possesses an improved water vapor barrier property in an environmentally friendly way.. Nanocellulose/AESO polymeric system including biodegradable nanocellulose and acrylated epoxidized soybean oil (AESO) is proposed to be prepared and applied in the surface treatment of paper to enhance paper water vapor barrier property. The processing techniques, key influences, as well as structural characteristic will be discussed to verify the successful preparation of nanocellulose/AESO polymeric system. Water vapor barrier performance of paper after nanocellulose/AESO polymeric system treatment is to be evaluated through water vapor transmission rate (WVTR) and hydrophilic investigation. Fluorescence-labeled nanocellulose will be used in characterizing the spreading and penetration of the polymeric system on the surface and inside of the treated paper to clarify the mechanisms for the barrier effects of nanocellulose/AESO polymeric system treated paper against water vapor. The project will provide theoretical fundamentals and technique for the development of paper as high barrier packaging materials.

由纤维素纤维为原材料抄造而成的纸张是一种被广泛使用的可降解包装材料，然而纸张自身亲水性、多孔性等因素导致其对水蒸气的阻隔性能较差,难以满足食品药品包装中高阻隔性的需求。改善纸张水蒸气阻隔性能的传统处理方法存在工艺复杂、难回收降解等局限性。因此，发展新型环保、并有效改善纸张水蒸气阻隔性能的包装材料十分必要。. 本研究拟以可降解纳米纤维素和环氧大豆油AESO为主要材料，制备纳米纤维素/AESO聚合体系并将其作用于纸张表面。通过方法工艺、影响因素、结构特征等研究，获得稳定的纳米纤维素/AESO聚合体系。该体系作用于纸张表面后，通过对纸张亲水性能、水蒸气透过率（WVTR）等的研究，验证其对纸张水蒸气阻隔性能的改善。利用荧光标记纳米纤维素示踪其在纸张表面的铺展以及内部渗透路径，阐明纳米纤维素/AESO聚合体系抵抗纸张水蒸气渗透的阻隔机制。为拓展纸张在高阻隔包装材料方向的发展提供理论与技术支持。

本项目以纳米纤维素和环氧大豆油AESO为主要材料，制备纳米纤维素/AESO聚合体系并将其作用于纸张表面，以期为改善纸张水蒸气阻隔性能提供一种环保有效的新方法。项目基于Pickering乳化技术，研究了氨基硅烷改性对纳米纤维素表面/界面润湿性能的影响，通过优化乳化工艺中纳米纤维素用量、油水比等参数，并结合乳液结构特征和流变行为分析，获得了相对稳定的水分散型纳米纤维素/AESO聚合体系。将该体系作用于纸张表面后，通过对纸张亲水性能、水蒸气透过率等的研究，验证了其对纸张水蒸气阻隔性能的改善作用效果，并利用荧光标记纳米纤维素示踪其在纸张表面的铺展以及内部渗透路径，探究纳米纤维素/AESO聚合体系抵抗纸张水蒸气渗透的阻隔机制，为拓展纸张在高阻隔包装材料方向的发展提供理论与技术支持。