VISCOELASTIC PROPERTIES OF ACRYLIC-BASED COPOLYMER BLENDS WITH THERMOPLASTICS

摘要

In this work,the viscoelastic properties of acrylic-based copolymer blends with poly (methyl methacrylate) and polycarbonate are investigated in the molten and solid states.Copolymers of MMA-BA with varying molecular weight and composition are used to enhance the Theological properties in shear and extension.The blends were prepared at 200 deg C using a DSM micro-compounder for up to 15 wt.% copolymer.The samples were characterized by size exclusion chromatography (SEC),dynamic mechanical analysis (DMA).The rheological properties were determined using small amplitude oscillatory measurements (SAOM) in shear and using a Rheotens device for melt strength determination.The results showed that depending on the nature of the copolymer used,the glass transition temperature (composition) and molecular weight,the rheological properties can be fine-tuned to enhance melt strength without a significant change in the shear rheology.