基于金属配位键交联的聚肟氨酯的制备与性能研究

Preparation and Properties of Poly(oxime urethanes)Crosslinked by Metal Coordination

采用丁二酮肟(DMG)、异佛尔酮二异氰酸酯(IPDI)、聚四氢呋喃二醇(PTMG)合成了线性室温自愈合的聚肟氨酯(DOU-PU),接着将不同的金属离子(Cu^(2+)和Zn^(2+))分别引入DOU-PU分子链中,得到含有不同金属配位键的Cu-DOU-PU、Zn-DOU-PU弹性体,探究金属离子对弹性体力学性能及自愈合性能的影响。结果表明:DOU-PU的拉伸强度达到7.3 MPa,室温自愈合16 h的拉伸强度恢复率达到82.2%,Cu-DOU-PU和Zn-DOU-PU弹性体的拉伸强度分别是DOU-PU的1.73和2.64倍,室温自愈合16 h自愈合率分别在64.6%和65.8%。金属配位键的存在提高了弹性体的玻璃化转变温度,降低了热分解温度。

A room-temperature self-healing polyurethane elastomer(DOU-PU)with linear structure was synthesized using dimethylglyoxime(DMG),isophorone diisocyanate(IPDI)and poly(tetramethylene ether)glycol(PTMEG).Then different metal ions(Cu^(2+)and Zn^(2+))were introduced into the DOU-PU molecular chain respectively,Cu-DOU-PU and Zn-DOU-PU elastomers with different metal coordination bonds were obtained,and the effects of metal ions on the mechanical properties and self-healing properties of the elastomers were studied.The results showed that the tensile strength of DOU-PU reached 7.3 MPa,the self-healing rate in room-temperature 16 h reached 82.2%.The tensile strength of Cu-DOU-PU and Zn-DOU-PU elastomers was 1.73 and 2.64 times that of DOU-PU,and the self-healing rate was 64.6%and 65.8%,respectively.The presence of metal coordination bonds elevated the glass transition temperature and reduced the thermal decomposition temperature.