聚氨酯增韧不饱和聚酯包覆层的研究

应用极限力学性能测试、差示扫描量热仪和扫描电镜等方法研究了含双键的聚氨酯(PUUP)对不饱和聚酯(CNVER)的增韧效果。结果表明,PUUP可明显增韧CNVER不饱和聚酯包覆层,随PUUP含量增加,包覆层的拉伸强度显著降低、延伸率明显增大;CNVER包覆层的玻璃化温度为41.1℃,PUUP包覆层的Tg为-4.87℃,两者共混的PUUP/CNVER(70/30)包覆层的玻璃化转化温度介于上述两者之间,为1.4℃;PUUP与CNVER的相容性好,2种聚合物共混后产生微相分离,赋予了材料良好的力学性能,是典型的橡胶增韧塑料材料。

Research on PUUP toughened unsaturated polyester inhibitor

The effect of PUUP(a type of polyurether) on the CNVER(unsaturated polyester) inhibitor is studied by uniaxial tensile test,DSC,SEM,etc.The results indicate that PUUP can obviously increase the flexibility of CNVER inhibitor.As the content of PUUP increasing,the maximum tensile stress of the inhibitor decreases and its elongation increases at the same time.The glass transition temperatures(Tg) of CNVER,PUUP and the polymer blend(PUUP/CNVER 70/30) are 41.1℃,-4.9℃ and 1.4℃,respectively,which suggests good compatibility between CNVER and PUUP.Moreover,the polymer blend inhibitor shows a typical mechanical behavior of rubber toughened plastic material.The formation of microphase separation in the polymer blend leads to the excellent mechanical properties.