Structure and mechanical properties of fast cooled and annealed poly(phenylene sulfide)/Vectra A blends

Abstract

Poly(phenylene sulfide) (PPS)/Vectra A blends were directly injection molded and obtained throughout the composition range both as molded, low crystallinity, and annealed highly crystalline materials. The blends were immiscible, but, contrary to an earlier work on PPS/Vectra A blends, they showed a clear fibrous morphology that was a consequence of the higher viscosity of the matrix compared with that of the Vectra A at the shear strain rate used. The mechanical properties of the annealed blends showed that when highly crystalline materials are sought, annealing post‐cold molding is a valid alternative to molding at high mold temperatures. The fracture properties of the as‐molded blends, such as ductility and tensile strength, were higher than in annealed blends, as a consequence of the higher deformability of the less crystalline structure. The presence of the LCP in the as‐molded low‐crystallinity PPS blends counteracts their intrinsic lower stiffness by means of a faster stiffness increase when Vectra A was added, compared with that which took place in annealed blends. These facts rendered the as‐molded PPS/Vectra A blends alternative materials to the usual highly crystalline ones.

Compatibilization of poly(ethylene terephthalat)/liquid crystal polymer blends by means of bisphenol a polycarboate

“…The studies related to compatibilization of PET/LCP blends are relatively scarce, reactive extrusion (14, 24, 31) and copolymer addition (39) being the techniques most commonly employed. The good properties and wide use of VA have led to much interest in their blends with thermoplastic matrices, e. g. poly(pheny1ene sulfide) (PPS) (40,41). polypropylene (PP) (29, 40,42), poly(ether imide) (PEI) (43), poly(ether sulfone) (PES) (44).…”

Synthesis and characterization of thermotropic liquid crystalline polyarylate with ether ether ketone segments in the main chain

“…To expand the application area of Vectra, a series of modified Vectra have emerged, such as Vectra A950 (75/25 HBA/HNA copolyester) and Vectra B950 (60/20/20 HNA/AP/TA copolyester) . Vectra A950 and B950 can also be used as addition agent to reinforce thermoplastic, such as poly(ester amide), poly(phenylene sulfide), poly(propylene) . Rath and co‐workers have studied the properties of Vectra A950/PPS blends with a compatibilizer.…”

In memoriam

“…VA is one of the most widely used commercial LCPs. It has been mixed with many thermoplastics40–42 and is, perhaps, the most used LCP in blends of two LCPs. For example, the mechanical properties,10, 12, 14, 19, 24, 25 miscibility,1, 11, 12, 14, 19, 24, 43 and rheology1, 14, 24, 25 of blends of VA with LCPs, such as 45/27.5/27.5 p ‐hydroxybenzoic acid/isophthalic acid/hydroquinone (HIQ45),1, 11 VB,10, 12, 43 HBA/TA/HQ,14, 24, 25 VC,11 60/40 p ‐hydroxybenzoic acid/ethylene terephthalate (R3),11 and R5,11, 19 have been studied.…”