摘要
以二环己基甲烷二异氰酸酯(H12MDI)、聚四亚甲基醚二元醇(PTMEG,Mn=1000)和脂肪族二元醇类扩链剂为原料,通过预聚体法合成了透明聚氨酯(PU)弹性体,通过核磁共振谱(NMR)确定了弹性体的化学结构,系统研究了不同结构扩链剂对产物力学性能、剥离性能和光学性能的影响,并用原子力显微镜(AFM)和X射线光电子能谱(XPS)法分析了PU与有机玻璃(PMMA)的剥离界面。结果表明:随扩链剂链长的增加,H12MDI型聚醚弹性体的拉伸强度、剥离强度和邵氏硬度降低,断裂伸长率增加;扩链剂长度对光学性能的影响很小;PU/PMMA界面处由于酯交换反应而进一步在PU和PMMA之间形成化学键。
Various segmented transparent polyurethanes were prepared from dicyclohexylmethane diisocyanate（H12MDI）,polytetramethylene glycol（PTMEG） with an Mn of 1000,and aliphatic diols as chain extenders by a standard prepolymer synthesis process.The effect of the structure of chain extender on the mechanical properties,peel adhesion properties and optical properties was investigated.The freshly exposed PU and PMMA adhesion failure surface was analyzed by XPS and AFM.With the increase of hard segment length,the tensile strength,peel strength and shore A hardness of the H12MDI based elastomer decrease and the elongation at break increases.The length of chain extender has little effect on the transparency of PU.Transesterification reaction exists in the interfacial region.
出处
《航空材料学报》
EI
CAS
CSCD
北大核心
2011年第4期74-80,共7页
Journal of Aeronautical Materials
关键词
聚氨酯
扩链剂
NMR
性能
界面
polyurethane
chain extender
NMR
performance
interface
