钛酸四丁酯引发聚己内酯接枝改性淀粉的制备

以玉米淀粉和己内酯单体为原料,以钛酸四丁酯为催化剂,通过原位开环聚合制备聚己内酯接枝改性淀粉,并利用红外光谱和差热扫描对接枝改性淀粉和玉米淀粉进行了比较.进而制备了接枝改性淀粉和聚己内酯的共混材料,并对共混材料的力学性能、疏水性和界面性能进行评价.结果表明,对淀粉进行接枝改性后能够有效改善共混材料两相的相容性,且共混材料的力学性能有所提高.共混材料的疏水性得到改善,吸水前后材料力学性能变化不大.

Synthesis of polycaprolactone-grafted-starch copolymer by tetrabutyl titanate

Polycaprolactone-grafted-starch (PCL-g-St) was synthesized with caprolactone and corn starch using tetrabutyl titanate as initiator via coordination-insertion ring-opening polymerization. PCL-g-St and corn starch were compared using FTIR and DSC. The blend of PCL and PCL-g-St was prepared, and the mechanical properties, hydrophobicity, interface properties of the blend were investigated. The results show that the compatibility of the two phases in the blend is effectively improved after the starch was grafted with PCL and the mechanical properties are also increased compared with a non-modified St/PCL blend. The hydrophobicity of the PCL-g-St/PCL blend is improved, and its mechanical properties are not much influenced after being soaked into the water.