Phase behavior and mechanical properties of blends of poly(butylene terephthalate) and poly(amino–ether) resin

Abstract

ABSTRACT:The structure, thermal and mechanical properties of blends of poly(butylene terephthalate) (PBT) and a poly(amino-ether) (PAE) barrier resin obtained by direct injection molding are reported. The slight shift of the glass transition temperatures (T g ) of the pure components when blended is attributed to partial miscibility rather than interchange reactions. Both the small strain and the break properties of the blends were close or even above those predicted by the direct rule of mixtures. The specific volume of the blends appeared to be the main reason for the modulus behavior. The linear values of the elongation at break indicated that the blends were compatible, and were attributed to a combination of good adhesion between the two phases of the blends and the small size of the dispersed phases.

High Compatibility and Improved Barrier Performance in Blends Based on a Copolyester Modified with a Poly(amino ether) Resin

“…Despite its recent development, it has already been blended with polyamide 6, [15,18,19] an amorphous polyamide, [17] poly(butylene terephthalate) (PBT) [16] and PET modified with PBT. [20] These experiments resulted in partially miscible blends with polyamide-6, PBT and PET modified with PBT, [15,16,20] and a practically immiscible blend with amorphous polyamide. [17] Moreover, interchange reactions have been observed in blends with amorphous polyamide [17] and PET-PBT.…”

“…Moreover, due to the presence of lateral hydroxyl groups in their chemical structure, they are likely to establish specific interactions (hydrogen bonding) with polymers having proton-acceptor moieties, such as polyesters or polyamides. In fact, both partial miscibility [15,16] and mechanical compatibility, [15][16][17] have been observed in blends of these two kinds of polymers. The joint presence of lateral hydroxyl groups and ester or amide moieties also posses the possibility of the development of interchange reactions in the melt state, which can also compatibilize the blends.…”

Thermal, thermo‐mechanical, and dynamic mechanical properties of polypropylene/cycloolefin copolymer blends

“…15 Analogous dependences of VST on the blend composition were published for blends consisting a semicrystalline polymer and an amorphous glassy polymer, i.e., polyoxymethylene/phenoxy, 47 polyamide/polyvinyl chloride (PVC), 48 and polybutyleneterephthalate/polyamino-ether. 49 In all cases, the initial linear decrease (up to about v 2 ¼ 0.3-0.4) in VST can be attributed to the softening of the majority semicrystalline component. In the composition range where glassy amorphous polymer becomes the dominating phase, whereas semicrystalline component loses its phase continuity, a steeper VST decrease was observed.…”

Solid‐State Structure and Mechanical Properties of Blends of an Amorphous Polyamide and a Poly(amino‐ether) Resin

“…Their applications are mainly in the packaging industry 4. Due to its recent commercialization, only blends of PAE with polyamide 6,5–7 and poly(butylene terephthalate), PBT,8 have been reported to our knowledge. Another poly(amino‐ether),9 has been used as a compatibilizer for polyamide 6/PBT blends.…”

“…Moreover, the hydroxyl groups of PAE could react during processing with the amide or ester moieties giving rise to copolymers which are able to compatibilize the blends. Thus, polyamide/PAE and polyester/PAE systems have a high potential for compatibility and, in fact, PAE blends with polyamide 65,6 and PBT8 are partially miscible and mechanically compatible. However, blends of amorphous polyamide with PAE have not yet been studied, to our knowledge.…”