In situ polyolefin elastomer/poly(trimethylene terephthalate) microfibrillar composites fabricated via multistage stretching extrusion

Abstract

The in situ polyolefin elastomer (POE)/poly(trimethylene terephthalate) (PTT) microfibrillar composites (MFCs) sheets were successfully prepared by multistage stretching extrusion with the assembly of laminating-multiplying elements (LMEs). The morphology of PTT phase was greatly influenced by the composition. The tensile strength of the sheets and the products which were some sheets secondary processing by compression molding were similar, when the weight ratio of POE/PTT was 90/10, the tensile strength was the highest. At this blend ratio, the diameters distribution of PTT microfibers was relative uniformity by scanning electron microscopy (SEM) studies, which was good to reinforce the POE. When the PTT content was higher, the distribution more scatter. Dynamic rheology studies showed that compared with the neat POE, when PTT content was 20 %, the storage modulus, loss modulus values and the complex viscosity were the highest while the tanδ was the lowest for the MFCs, especially at low frequency (ω 100 rad/s), the differences became negligible.