New approach to recycle office waste paper: Reinforcement for polyurethane with nano cellulose crystals extracted from waste paper
New approach to recycle office waste paper: Reinforcement for polyurethane with nano cellulose crystals extracted from waste paper
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回收办公废纸的新方法：用从废纸中提取的纳米纤维素晶体增强聚氨酯
DOI：
10.1016/j.wasman.2019.06.003
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发表时间：
2019-07-15
期刊：
影响因子：
8.1
通讯作者：
Huang, Zhigang
中科院分区：
文献类型：
--
作者：
Lei, Wanqing;Zhou, Xing;Huang, Zhigang
本文提出了一种新的办公废纸回收方法，从废纸中提取纤维素纤维（CNC），并将其作为有机填料用于聚氨酯弹性体（PUE）的热性能增强。以N，N-二甲基甲酰胺为溶剂，通过改变CNC的含量（0.5，1，2，3，4 ~ 5wt%），采用两步法原位制备了CNC/PUE纳米复合材料。结果表明，CNC与PUE以共价键结合，且与PUE的硬段形成强氢键有关。CNC和PUE之间的相互作用导致纳米复合材料的热性能和热机械性能提高，吸水率降低。重要的是，具有2wt%含量CNC的PUE（CNC/PUE 2）的初始降解温度增加了21 ° C。CNC/PUE 2具有较好的综合性能，但吸水率较差，这使得CNC/PUE 2在承重和户外应用中具有吸引力。因此，本工作不仅提供了一种新的废纸回收方法，而且还提供了一种成本较低的热不稳定PUE。(C)2019爱思唯尔有限公司版权所有。
New approach to recycle office waste paper was purposed in this paper, i.e., cellulose nanocrystal (CNC) was extracted from waste paper and then used CNC as the organic filler to reinforce polyurethane elastomer (PUE) in thermal properties. A series of CNC/PUE nanocomposites was prepared in situ using a two-step process in solvent N,N-dimethylformamide solution by changing the content of CNC from 0.5, 1, 2, 3, 4 to 5 wt%. The results showed that CNC was covalently bonded to PUE, and specifically concerned with the hard segments of PUE resulting from the strong hydrogen bonding. The interactions between CNC and PUE caused the increased thermal and thermo-mechanical properties, and decreased water absorption of nanocomposites. Importantly, the initial degradation temperature of PUE with 2 wt% content CNC (CNC/PUE2) increased by 21 degrees C. CNC/PUE2 had the better comprehensive properties with the worse water absorption, which made CNC/PUE2 appealing in load bearing and outdoor applications. Hence, this work not only provided a new recycling method of waste paper but also provided a thermolstable PUE with lower cost. (C) 2019 Elsevier Ltd. All rights reserved.