School of Mechanical and Precision Instrument Engineering, Xi'an University of Technology, Xi'an 710048, PR China; Faculty of Printing, Packing Engineering and Digital Media Technology, Xi'an University of Technology, Xi'an 710048, PR China.
School of Mechanical and Precision Instrument Engineering, Xi'an University of Technology, Xi'an 710048, PR China; Faculty of Printing, Packing Engineering and Digital Media Technology, Xi'an University of Technology, Xi'an 710048, PR China.
Carbohydr Polym. 2019 Apr 1;209:299-309. doi: 10.1016/j.carbpol.2019.01.013. Epub 2019 Jan 6.
Focusing on eco-friendly materials, cellulose nanocrystal (CNC) extracted from office waste paper was used to reinforce waterborne polyurethane (WPU) with varying content by two incorporation routes including blending method by sonication after WPU synthesis (BCNC/WPU) and the alternative in-situ during the WPU synthesis process (CNC/WPU). The results showed that new interaction between CNC and WPU through hydrogen bonds in the interfacial area was formed and CNC reinforced hard segments effectively. However, the interaction in BCNC/WPU was not as stronger as that in CNC/WPU. Besides, CNC improved thermal stability of WPU remarkably, especially BCNC/WPU. The addition of CNC caused a delay around 50 °C in the start of the degradation process, and a delay of 5-18 °C and 2-20 °C in the temperatures at 10 and 50 wt% weight loss, respectively. These eco-friendly and biodegradable novel materials have potential applications in medical and biologic fields.
专注于环保材料，从办公废纸中提取的纤维素纳米晶体（CNC）通过两种掺入途径（包括 WPU 合成后通过超声处理的共混方法（BCNC/WPU）和 WPU 合成过程中的替代原位方法（CNC/WPU）），以不同含量增强水性聚氨酯（WPU）。结果表明，在界面区域通过氢键形成了 CNC 和 WPU 之间的新相互作用，并有效增强了 WPU 的硬段。然而，BCNC/WPU 中的相互作用不如 CNC/WPU 强。此外，CNC 显著提高了 WPU 的热稳定性，特别是 BCNC/WPU。添加 CNC 导致降解过程开始时的延迟约 50°C，并且在 10wt%和 50wt%重量损失时的温度分别延迟 5-18°C 和 2-20°C。这些环保且可生物降解的新型材料在医学和生物领域具有潜在应用。
