Enhanced Mechanical and Shape Memory Properties of Poly(propylene glycol)‐Based Star‐Shaped Polyurethane,Macromolecular Chemistry and Physics

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Enhanced Mechanical and Shape Memory Properties of Poly(propylene glycol)‐Based Star‐Shaped Polyurethane
Macromolecular Chemistry and Physics ( IF 2.5 ) Pub Date : 2020-06-09 , DOI: 10.1002/macp.202000082
Zhaozan Xu ₁ , Yangli Cui ₁ , Tingting Li ₂ , Haichun Dang ₂ , Jianfeng Li ₁ , Fangqin Cheng ₁

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A poly(propylene glycol)‐based star‐shaped thermoplastic shape memory polyurethane elastomer (STPU) is synthesized by bulk polymerization with the addition of trifunctional poly‐propylene glycerol (PPG‐3) to improve the mechanical and shape memory properties. The mechanical properties are enhanced significantly with the addition of PPG‐3. The tensile strength of STPU is up to 36.0 MPa, which is almost two times higher than that of linear polyurethane (18.4 MPa). The star‐shaped structure, reduction in microphase separation, and good phase compatibility of STPU are the reasons for the enhancement of mechanical properties. The branching degree of STPU (up to 1.83) is much higher than that of linear polyurethane (0.5). STPU shows higher shape memory fixity ratio (97.2%) at −10 °C and recovery ratio (96.7%) at 40 °C than TPU. Therefore, the design and synthesis of star‐shaped polyurethane is an effective approach for improving the mechanical and shape memory properties of polyurethane elastomer.

中文翻译：

聚丙二醇基星形聚氨酯的增强的机械性能和形状记忆性能

通过本体聚合并添加三官能聚丙三醇（PPG-3）来合成基于聚丙二醇的星形热塑性形状记忆聚氨酯弹性体（STPU），以改善机械和形状记忆性能。添加PPG-3可以显着提高机械性能。STPU的拉伸强度高达36.0 MPa，几乎是线性聚氨酯（18.4 MPa）的两倍。STPU的星形结构，微相分离的减少以及良好的相相容性是增强机械性能的原因。STPU的支化度（最高为1.83）远高于线性聚氨酯的支化度（0.5）。与TPU相比，STPU在-10°C时显示出更高的形状记忆固定率（97.2％），在40°C时显示出更高的恢复率（96.7％）。因此，

更新日期：2020-06-09

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