聚氨酯-环氧树脂复合材料的力学性能与韧化机制
Mechanical properties and toughening mechanism of polyurethane epoxy resin composite materials
马衍轩 1付双阳 2王帅飞 2吴睿 2高玉华 2李美玉 2张建 3张鹏 1高嵩1
作者信息
- 1. 青岛理工大学 土木工程学院,青岛 266520;海洋环境混凝土技术教育部工程研究中心,青岛 266520
- 2. 青岛理工大学 土木工程学院,青岛 266520
- 3. 青岛青新阳光集团有限公司,青岛 266404
- 折叠
摘要
环氧树脂材料固化后脆性大、韧性差,表面容易发生老化、龟裂、剥落等问题,难以保护混凝土应对海工环境等复杂的工况.设计、制备了不同体系的聚氨酯/环氧树脂(PU/EP)复合材料,以PU/EP复合材料的拉伸强度、断裂伸长率、冲击韧性作为评价指标进行了正交实验,结合响应面分析法确定了PU/EP复合材料的最佳制备配方为:PU预聚体原材料n(OH-)∶n(NCO-)的摩尔比(Molar ratio of n(OH-)∶n(NCO-),R)为1、PU掺量为15wt％、制备温度为80℃.研究结果表明:聚氨酯(PU)和EP交联效果良好,PU/EP复合材料的拉伸强度、断裂伸长率、冲击韧性较纯环氧树脂分别提高 37.61％、52.21％、47.07％.随着PU掺量的增加,材料中柔性长链段的比例增大,形成二级网络的区域增大,分子间的配位作用以及软连段的增加极大提高了材料的力学性能,并且PU/EP复合材料的硬度和弹性模量有一定程度的降低.
Abstract
Epoxy resin materials have high brittleness and poor toughness,and are prone to aging,cracking,and peeling on the surface,making it difficult to protect concrete from complex working conditions such as marine environments.Polyurethane/epoxy resin(PU/EP)composite materials with different systems were designed,and orthogonal experiments were conducted using the tensile strength,fracture elongation,and impact toughness of PU/EP composite materials as evaluation indicators.The optimal preparation formula for PU/EP composite materials was determined through response surface analysis method,with R value of 1,PU content of 15wt％,and preparation temperature of 80℃.The results show that the crosslinking effect of PU and EP is good,and the tensile strength,fracture elongation,and impact toughness of PU/EP composite materials are improved by 37.61％,52.21％,and 47.07％compared with pure epoxy resin,respectively.With the increase of PU content,the proportion of flex-ible long chain segments in the material increases,and the area forming the secondary network increases.The co-ordination effect between molecules and the increase of soft connecting segments greatly improves the mechanical properties of the material,and the hardness and elastic modulus of PU/EP composite materials are reduced to a certain extent.
关键词
环氧树脂/聚氨酯/增韧设计/力学性能/韧化机制Key words
epoxy resin/polyurethane/toughened design/mechanical/toughening mechanism引用本文复制引用
出版年
2024
NETL
NSTL
万方数据