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Heat and solvent responsive polytriazole: shape recovery properties in different solvents

机译:热溶剂响应性聚唑:不同溶剂中的形状回收性质

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Shape memory polytriazole actuatable by both heat and solvents is presented. Hydrogen bonding solvents exhibit strong influence on shape recovery. In this work, a dual-stimuli responsive (both temperature and solvents) polymer is synthesized from propargylated bisphenol-F (PF) and a tris azide (TA) monomer via an azide–alkyne polycycloaddition reaction in the presence of a copper catalyst. The polytriazole exhibits a trigger temperature at 103 °C and displays cyclic shape memory properties. The SMP shows a storage modulus >2 GPa with a cross-link density of 6.9 × 10 ~(3) mol m ~(?3) . The SMP possesses shape memory features in different solvents. Highly polar solvents lead to shape recovery with cracks whereas hydrogen bonding solvents like ethanol supported crack-free shape recovery. A two-step kinetic profile is seen in the shape recovery sequence of SMP in hydrogen bonding solvents. The SMP is hydrophobic and no recovery in water is observed.
机译:提出了通过热量和溶剂可致动的形状记忆聚唑。氢键粘合溶剂对形状回收产生强烈影响。在这项工作中,通过在铜催化剂存在下通过叠氮化的双酚-F(PF)和Tris叠氮化物(TA)单体合成双刺激响应(温度和溶剂)聚合物。多唑在103℃下表现出触发温度,并显示循环形状记忆性能。 SMP显示储存模量> 2 GPA,交叉链接密度为6.9×10〜(3)mol m〜(α3)。 SMP具有不同溶剂的形状记忆功能。高极性溶剂导致裂纹形状回收,而氢键溶剂如乙醇支持的裂缝形状回收。在氢键合溶剂中的SMP的形状回收序列中看到了两步动力学曲线。 SMP是疏水性的,没有观察到水中的恢复。

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