Preparation of Polyurethane‐Urea Elastomers Using Low Molecular Weight Aliphatic Diamines Enabled by Reversible CO2 Chemistry,Macromolecular Chemistry and Physics

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Preparation of Polyurethane‐Urea Elastomers Using Low Molecular Weight Aliphatic Diamines Enabled by Reversible CO2 Chemistry
Macromolecular Chemistry and Physics ( IF 2.5 ) Pub Date : 2020-06-09 , DOI: 10.1002/macp.202000145
Bo Zhang _{1,

2,

3} , Xiaoxiao Li _{1,

2,

3} , Yumeng Tian _{1,

2,

3} , Jie Wang _{1,

3} , Xiaoli Zhao _{1,

2,

3} , Xiaoniu Yang _{1,

2,

3}

Affiliation

The use of low molecular weight (LMw) aliphatic diamines for the synthesis of polyurethane‐urea elastomers (PUUEs) is an effective method for introducing abundant, strong hydrogen bonds with the aim of improving the thermal and mechanical properties of PUUEs. However, the reaction between isocyanates and LMw aliphatic diamines is too rapid to produce PUUEs. In this study, PUUEs incorporating LMw aliphatic diamines as chain extenders are prepared via the reversible reaction of CO₂ with diamines. The phase separation, thermal properties, and thermomechanical and mechanical properties of polyurethane materials are investigated as the chain extender changed from diol to diamine. Replacing the diol chain extenders with diamine results in the formation of more abundant and stronger hydrogen bonds in PUUEs, which enables the assembly of long range ordered structures and improved microphase separation. The tensile strengths of PUUEs, from 8.4 to 13 MPa, are much higher than their corresponding polyurethanes, owing to the physical crosslinks formed by the more and stronger hydrogen bonds in the PUUEs.

中文翻译：

利用可逆CO2化学作用的低分子量脂族二胺制备聚氨酯脲弹性体

使用低分子量（LMw）脂肪族二胺合成聚氨酯-脲弹性体（PUUEs）是引入大量强氢键的有效方法，目的是改善PUUE的热性能和机械性能。但是，异氰酸酯和LMw脂族二胺之间的反应太快，无法生成PUUE。在这项研究中，通过LM ₂的可逆反应制备了掺有LMw脂肪族二胺作为扩链剂的PUUE。与二胺。随着扩链剂从二醇变为二胺，研究了聚氨酯材料的相分离，热性能以及热机械性能。用二胺取代二醇扩链剂会在PUUE中形成更丰富和更强的氢键，从而能够组装长程有序结构并改善微相分离。由于PUUE中更多和更强的氢键形成的物理交联，PUUE的拉伸强度为8.4至13 MPa，远远高于其相应的聚氨酯。

更新日期：2020-06-09

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