A Transparent, High Refractive, Shape‐Memory, Healable, and Recyclable Phenolic Polyurethane Thermoset: Unexpected Roles of Bromine Substituents and Tertiary Amine Catalysts,Macromolecular Chemistry and Physics

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A Transparent, High Refractive, Shape‐Memory, Healable, and Recyclable Phenolic Polyurethane Thermoset: Unexpected Roles of Bromine Substituents and Tertiary Amine Catalysts
Macromolecular Chemistry and Physics ( IF 2.5 ) Pub Date : 2020-02-09 , DOI: 10.1002/macp.201900493
Lu Bai ₁ , Junping Zheng ₁

Affiliation

The applications of polyurethane (PU) thermosets are limited by the lack of plasticity after curing due to permanent crosslinks. Besides, the low refractive index is insufficient for optical devices. Here, a transparent, high refractive, recyclable, and healable PU thermoset is developed based on dynamic bromined phenyl‐carbamate bonds (BPCB). It exhibits tensile strength of ≈52 MPa, good shape‐memory ability, and can be reprocessed or healed nearly completely at 110 °C in 30 min. Tertiary amine catalysts and bromine substituents jointly play unexpected roles to promote the forward and reverse reactions significantly, leading to high bond‐exchange efficiency of BPCB. Furthermore, the introducing of BPCB can endow the material with higher refractive index (n_D = 1.5850) simultaneously. In summary, this material is of potential as dynamic PU thermoset in various fields, especially in advanced optical devices.

中文翻译：

透明，高折射率，形状记忆，可修复和可回收的酚醛聚氨酯热固性材料：溴代用品和叔胺催化剂的意外作用

由于永久性交联，固化后缺乏可塑性限制了聚氨酯（PU）热固性材料的应用。此外，低折射率不足以用于光学装置。在此，基于动态溴化苯基氨基甲酸酯键（BPCB）开发了透明，高折光，可回收和可修复的PU热固性材料。它具有约52 MPa的拉伸强度，良好的形状记忆能力，可以在110°C的温度下在30分钟内将其重新加工或完全愈合。叔胺催化剂和溴取代基共同发挥出乎意料的作用，从而显着促进正向和反向反应，从而提高了BPCB的键交换效率。此外，引入BPCB可以赋予材料更高的折射率（n _D= 1.5850）。总之，这种材料在各种领域，特别是在先进的光学设备中，具有作为动态PU热固性材料的潜力。

更新日期：2020-02-09

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