Eco-friendly waterborne polyurethane reinforced with cellulose nanocrystal from office waste paper by two different methods
Eco-friendly waterborne polyurethane reinforced with cellulose nanocrystal from office waste paper by two different methods
复制标题
两种不同方法用办公废纸中的纤维素纳米晶增强环保水性聚氨酯
DOI：
10.1016/j.carbpol.2019.01.013
复制
发表时间：
2019-04-01
影响因子：
11.2
通讯作者：
Li, Yaguang
中科院分区：
文献类型：
--
作者：
Lei, Wanqing;Zhou, Xing;Li, Yaguang
着眼于环保材料，从办公废纸中提取的纤维素纳米晶（CNC）用于增强不同含量的水性聚氨酯（WPU），通过两种掺入途径，包括WPU合成后超声共混法（BCNC/WPU）和WPU合成过程中的替代原位法（CNC/WPU）。结果表明，CNC和WPU之间通过界面区域的氢键形成了新的相互作用，CNC有效地增强了硬段。然而，BCNC/WPU 中的相互作用不如 CNC/WPU 中的相互作用强。此外，CNC显着提高了WPU的热稳定性，尤其是BCNC/WPU。 CNC的添加导致降解过程的开始延迟约50℃，并且在10wt％和50wt％重量损失时的温度分别延迟5-18℃和2-20℃。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的应用前景。
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 degrees C in the start of the degradation process, and a delay of 5-18 degrees C and 2-20 degrees 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.