抄録
To improve the mechanical properties of poly(butylene terephthalate) (PBT), the effect of adding two types of PBT-derived elastomer, Pelprene (PEL), with and without a reactive compatibilizer, was investigated. The impact strength of neat PBT 3.5 kJ/m2 increased to 19.0 kJ/m2 at 223 K when 30 wt% PEL and 3.2 phr compatibilizer were added. SEM observations showed that neat PBT had brittle fracture patterns while PBT/PEL/compatibilizer blends had ductile properties; the morphological change was particularly clear when more than 0.8 phr compatibilizer was added. Dynamic modulus ratios, (E'T=100K- E'T=300K)2/E'T=100K, were obtained by DMA, for which some linear correlations with the Charpy impact strength of the blends was found. During tensile testing, the elongation at break of the PBT/PEL/compatibilizer blend increased remarkably with compatibilizer content in comparison with that of with PBT/PEL. Viscoelastic measurements revealed that the value of G' for the PBT/PEL/compatibilizer blends also increased with compatibilizer content. Furthermore, Takayanagi's model was employed to estimate the interaction phase between PBT and PEL, the volume fraction of which was found to increase with compatibilizer content. Consequently, when the reactive compatibilizer was added to PBT/PEL blends, an interaction interface between the PBT and PEL phases was formed, and their compatibility was improved.
