不同脂环族硬段分布的自愈合聚氨酯的制备及性能
作者:
作者单位:

河南工程学院 化工与印染工程学院

中图分类号:

TQ630

基金项目:

河南省科技攻关项目(242102311245),河南省高等学校重点科研项目(24A430010),河南工程学院博士培育基金(D2021004)和河南省大学生创新创业训练计划(202411517023,202311517020).


Preparation and properties of self-healing polyurethanes with different ring-type hard segment distributions
Author:
Affiliation:

School of Chemical and Printing-dyeing Engineering,Henan University of Engineering

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    摘要:

    通过六亚甲基二异氰酸酯(HDI)与聚碳酸酯二醇-2000(PCDL-2000)间的反应制备出不同分子量的PCDL,并以此为软段与异佛尔酮二异氰酸酯(IPDI)、1,4-丁二醇(BDO)反应,制备出不同脂环族硬段分布的3种自愈合聚氨酯(PC-PU)。采用FTIR、XRD、TGA、AFM、3D超景深显微镜、电子万能试验机对PC-PU进行了表征,测试了PC-PU的晶体结构、结晶形态、热稳定性、拉伸性能及自愈合性能,探究了其自愈合机理。结果表明,随着脂环族硬段分布的集中,PC-PU的结晶度由23.3%增加至26.5%,弹性模量由17.9 MPa升高至62.7 MPa,断裂伸长率由1420%降低至1060%,拉伸强度则介于18.6 MPa和20.5 MPa之间。基于氢键作用及软段的热运动,PC-PU的自愈合效率最高可达81.9%,表明制备的PC-PU在具有优异力学性能的同时兼具自愈合性能。

    Abstract:

    Polycarbonate diol (PCDL) with different molecular weights was synthesized from hexamethylene diisocyanate (HDI) and PCDL-2000, and three self-healing polyurethanes (PC-PUs) with different alicyclic-type hard-segment distributions were prepared by reacting PCDL as soft segments with isophorone diisocyanate (IPDI) and 1,4-butanediol (BDO). PC-PU was characterized by FTIR, XRD, TGA, AFM, 3D ultra- depth-of-field microscope, and electronic universal testing machine, the crystal structure, crystalline morphology, thermal stability, tensile properties and self-healing properties of PC-PU were tested, and the self-healing mechanism was investigated. The results showed that the crystallinity of PC-PU increased from 23.3% to 26.5%, the modulus of elasticity increased from 17.9 MPa to 62.7 MPa, the elongation at break decreased from 1420% to 1060%, and the tensile strength ranged between 18.6 MPa and 20.5 MPa as the distribution of the alicyclic-type hard segments was concentrated. Based on the hydrogen bonding and the thermal movement of the soft segments, the self-healing efficiency of PC-PU could be as high as 81.9%, indicating that the prepared PC-PU possessed both excellent mechanical properties and self-healing properties.

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王玉杰,聂慧芳,刘梓豪,辛再旺,杨远扬,王非.不同脂环族硬段分布的自愈合聚氨酯的制备及性能[J].精细化工,2024,41(12):

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  • 收稿日期:2024-07-29
  • 最后修改日期:2024-08-28
  • 录用日期:2024-08-22
  • 在线发布日期: 2024-12-10
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