Paper Title
Influence Of Poly (Ethylene Carbonate) With Methylene Diphenyl Diisocyanate And Styrene-Acrylic Multi-Functional Oligomeric Chain Extender

Abstract
Poly(ethylene carbonate)(PEC) is a biodegradable amorphous polymer, and it exhibits elastomeric characteristics. However commercialization of the material for thermoplastic applications has been complicated by low thermal and processing properties. This study focuses on using chain extenders to improve thermal stability and melt strength of PEC. The effects of a methylene diphenyl diisocyanate(MDI) or styrene-acrylic multi-functional oligomeric chain extender(Joncryl) on the properties of the PEC were investigated. Melt flow revealed that the chain extenders led to a significant increase of melt viscosity. Differential scanning calorimetry analysis showed that the glass transition temperature of modified PEC/MDI, PEC/Joncryl was increased due to the branching and extended chain structure. However, Modified PEC/MDI observed the formation of crosslinking and branching. Thermal gravity analysis also showed that the addition of MDI increased the decomposition temperature of PEC. It was found that MDI has slightly higher and faster chain extension reactivity than Joncryl. Keywords: Poly (Ethylene Carbonate), Methylene diphenyl diisocyante, Joncry, Chain extender.