Thermal, Mechanical and Rheological Properties of Poly(lactic acid) Chain Extended with Polyaryl Polymethylene Isocyanate

다국어 초록 (Multilingual Abstract)

In this study, polyaryl polymethylene isocyanate (PAPI) was used as a chain extender for poly(lactic acid) (PLA)to produce a high molecular weight material with better rheological, thermal and mechanical properties. The reactionbetween PLA chains and PAPI was proved by FTIR during reactive blending. The results showed that the molecular weightand molecular weight distribution were increased with the addition of PAPI content due to the chain extension. Chainextension was also responsible for the increased modulus and complex viscosity. The glass transition temperature (Tg) andthermal stability increased by incorporating with PAPI. The results of mechanical properties showed that a considerablyhigher tensile strength and Young’s modulus of the reactive blends compared with neat PLA.

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