A Single Molecular Diels-Alder Crosslinker for Achieving Recyclable Cross-Linked Polymers
A Single Molecular Diels-Alder Crosslinker for Achieving Recyclable Cross-Linked Polymers
复制标题
用于实现可回收交联聚合物的单分子狄尔斯-阿尔德交联剂
DOI：
10.1002/marc.201500257
复制
发表时间：
2015-09-01
影响因子：
4.6
通讯作者：
Sun, Pingchuan
中科院分区：
文献类型：
--
作者：
Chen, Shengli;Wang, Fenfen;Sun, Pingchuan
设计、合成了一种将Diels-Alder(DA)加合物的热可逆性结合在一个分子中的三元功能交联剂，并将其作为传统交联剂的理想替代品，以非常简单有效的方法制备了具有优异力学性能和可回收利用性能的热可循环交联型聚氨酯。通过差示扫描量热法和原位变温固体核磁共振实验，验证了这些材料在合适的温度下发生DA/Retro-DA反应所获得的循环性能。通过热压成型、注射成型和溶液浇注三种聚合物加工方法，证明了本体聚氨酯的热回收和修补能力。值得注意的是，与合成的样品相比，所有回收的交联型聚合物都显示出几乎恒定的伸长率/断裂应力。这种单分子DA交联剂的进一步端基功能化为制备广泛的可回收交联型聚合物提供了可能性。
A triol-functional crosslinker combining the thermoreversible properties of Diels-Alder (DA) adducts in one molecule is designed, synthesized, and used as an ideal substitute of a traditional crosslinker to prepare thermal recyclable cross-linked polyurethanes with excellent mechanical properties and recyclability in a very simple and efficient way. The recycle property of these materials achieved by the DA/retro-DA reaction at a suitable temperature is verified by differential scanning calorimetry and in situ variable temperature solid-state NMR experiments during the cyclic heating and cooling processes. The thermal recyclability and remending ability of the bulk polyurethanes is demonstrated by three polymer processing methods, including hot-press molding, injection molding, and solution casting. It is notable that all the recycled cross-linked polymers display nearly invariable elongation/stress at break compared to the as-synthesized samples. Further end-group functionalization of this single molecular DA crosslinker provides the potential in preparing a wide range of recyclable cross-linked polymers.