带侧烷基聚酯型聚氨酯的微相分离与耐湿热性能  

Microphase Separation and Heat-Humidity Resistance of Polyester Polyurethanes with Side Alkyl Groups

作　　者：曾妍 易玉华[1] Yan Zeng;Yuhua Yi(College of Mechanical&Automotive Engineering,South China University of Technology,Guangzhou 510641,China)

机构地区：[1]华南理工大学机械与汽车工程学院,广东广州510641

出　　处：《高分子材料科学与工程》2024年第11期11-18,共8页Polymer Materials Science & Engineering

摘　　要：为了分析侧烷基对聚酯型聚氨酯(PU)耐湿热性能的影响,分别采用聚己内酯二醇(PCL220N)、聚己二酸己二醇酯二醇(CMA2066)、聚己二酸-2-丁基-2-乙基-1,3丙二醇酯二醇(PBEPG)和聚己二酸-3-甲基-1,5戊二醇酯二醇(P2010)为软段制备了PU材料。红外光谱、动态力学热分析、热重分析和水接触角分析表明,侧烷基能提高PU软硬段间微相分离程度,软段的玻璃化转变温度降低,与水的接触角增大,耐湿热性能提高。带丁基、乙基双侧烷基的PBEPG-PU,其软段和硬段各自形成微区,观察到2个tanδ峰,微相分离程度高,拉伸强度为22.2 MPa,同时表面疏水性强,100℃,100%RH下老化36 h后拉伸强度保持率为71.2%,表现出较好的耐湿热性能和较高的力学强度。In order to analyze the effect of lateral alkyl on the moisture and heat-humidity resistance of polyester polyurethane(PU),poly3-methyl-1,5-pentanediol adipate(P2010),poly2-butyl-2-ethyl-1,3-propylene glycol ester(PBEPG),polyhexadipate diol(CMA2066)and polycaprolactone diol(PCL220N)were used as soft segment to prepare PU materials,respectively.FT-IR,DMA,TG and water contact angle analysis show that side alkyl can improve the microphase separation degree between soft and hard PU segments,reduce the glass transition temperature of soft segments,increase the contact angle with water,and improve the moisture and heat resistance.Two tanδpeaks are observed in the soft and hard segments of PBEPG-PU with butyl and ethyl bilateral alkyl groups.The tensile strength is 22.2 MPa and the surface hydrophobicity is strong.The tensile strength retention rate is 71.2%after aging at 100℃and 100%RH for 60 h.It shows good resistance to moisture and heat,and high mechanical strength.

关 键 词：聚酯型聚氨酯 烷基侧基 微相分离 耐湿热性能 

分 类 号：TQ323.8[化学工程—合成树脂塑料工业]