Modification of PLA with Chain Extender

摘要

In this study, oligomer Joncryl ADR was used to extend the chains and improve the mechanical properties. The chain extender multifunction epoxide was used with concentrations of 0.5 and 0.9 wt%. Pure and modified PLAs were characterized using DSC, MFI and FT-IR. The DSC results showed that Tg shifted to the high temperature and T_m increased slightly after chain extending. The MFI of the blends decreased with increasing the content of the CE which means the increase of molecular weight. The coupling between epoxy groups of CE and end groups of PLA was confirmed by FTIR tests. This coupling led to significant improvement in tensile strength and modulus.