Thermal and mechanical analysis of urethane acrylate graft copolymer

Abstract EN

Microphase separation occurred in all polymethyl methacrylate graft urethane copolymer (PMMA-g-UM2) and poly normal but methacrylate (PnBMA-g-UM2) copolymers: two glass transitions temperatures corresponding to the PMMA or PnBMA and UM2 fractions, respectively, were observed.

On the other hand, Dynamic mechanical analysis (DMA) and Differential scanning calorimetry (DSC) results showed that in most graft copolymer products the two respective component parts PMMA-g-UM2 or PnBMA-g- UM2 were compatible, because only one Tg was observed.

Two glass transitions occurred for PMMA or PnBMA and UM2 when the amount of UM was increased to 55 wt % during copolymerization and microphase separation was evident in DSC, DMA and Transmission electron microscopy TEM measurements.

Thermal stability and storage modulus (stiffness) of all the synthesized PMMA-g-urethane and PnBMA-g-urethane copolymers increased as the concentration of urethane macromonomer in the copolymerization feed increased, as confirmed in TGA and DMA results.