Rheologic behaviour of poly(ethylene terephthalate)-glass fiber composite system

Poly(ethylene terephthalate) (PET) was modified by addition of glass fibers (GF) and poly(ethylene-co-glycidylmethacrylate) (EGMA). Dynamic rheologic behaviors of PET, PET-GF and PET-GF-EGMA composites were studied by means of ARES Rheometer. The effects of angular frequency (ω) on storage modulus (G′), loss modulus (G″), loss factor (tan δ) and dynamic viscosity (h) were examined. G′ of PET was much lower than its G″ due to slippage of molecular-chain. Introduction of GF led to increase of both G′ and G″, but its contribution to G′ was a little bit more, while tan δ decreased and h increased. Introduction of EGMA could also improve both G′ and G″ of PET-GF, but its effect on G′ was more obvious. Addition of small amount of EGMA could decrease tan δ of PET-GF melt effectively.