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Multimethod Recyclable Thermoset Polybutadiene Polyurethane–Urea via Reversible Disulfide Bonds
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2024-05-14 , DOI: 10.1021/acsapm.4c01009
Zhaoran Xu 1 , Yecheng Fan 1 , Ping Tao 2 , Liangyan Wang 2 , Chunming Wang 2 , Xuewen Guo 3 , Yiwu Quan 1
Affiliation  

The thermoset polyurethane materials are characterized by excellent comprehensive properties. However, the stable cross-linked network structure limits their reprocessability and recyclability. In this study, a thermoset polybutadiene polyurethane–urea material with excellent recyclable and reprocessable properties was prepared. The polyurethane–urea material was prepared by reacting isocyanate-capped polybutadiene prepolymer with curing agent 2,2′-dithiodianiline (DTDA containing dynamic disulfide bonds). The tensile strength and elongation at break of the materials were approximately 21.3 MPa and 604%, respectively. The thermoset pieces underwent a dynamic disulfide exchange reaction in DTDA/toluene solution and rapidly degraded to soluble fragments (a series of aniline-terminated low-molecular-weight materials) after 40 min at 60 °C. When the recycled soluble fragments were reacted with isocyanate compounds, a thermoset material was obtained again. The tensile strength and elongation at break of the material exceeded 98% of the initial values. After the above degradation–recycling process was repeated once more, the mechanical properties of the second recycled material remained unchanged. Additionally, the thermoset pieces were remolded after being hot-pressed at 150 °C for 10 min to produce high-performance materials. This study uses dynamic disulfide bonds to achieve degradation, recovery, and reprocessing utilization of a high-strength thermoset polyurethane–urea material.

中文翻译:


通过可逆二硫键的多方法可回收热固性聚丁二烯聚氨酯-脲



热固性聚氨酯材料具有优异的综合性能。然而,稳定的交联网络结构限制了它们的可再加工性和可回收性。在这项研究中,制备了一种具有优异可回收和可再加工性能的热固性聚丁二烯聚氨酯-脲材料。聚氨酯-脲材料是通过异氰酸酯封端的聚丁二烯预聚物与固化剂2,2'-二硫代二苯胺(含有动态二硫键的DTDA)反应制备的。材料的拉伸强度和断裂伸长率分别约为21.3 MPa和604%。热固性碎片在DTDA/甲苯溶液中进行动态二硫键交换反应,并在60℃下40分钟后迅速降解为可溶性片段(一系列苯胺封端的低分子量材料)。当回收的可溶片段与异氰酸酯化合物反应时,再次获得热固性材料。材料的拉伸强度和断裂伸长率超过初始值的98%。再次重复上述降解-回收过程后,第二次回收材料的力学性能保持不变。此外,热固性部件在150℃热压10分钟后进行重塑,生产出高性能材料。本研究利用动态二硫键实现高强度热固性聚氨酯-脲材料的降解、回收和再加工利用。
更新日期:2024-05-14
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