Dynamically vulcanized polyarylene sulfide composition

摘要

Polyarylene sulfide compositions are described that exhibit high strength and flexibility. Methods for forming the polyarylene sulfide compositions are also described. Formation methods include dynamic vulcanization of a polyarylene sulfide composition that includes an impact modifier dispersed throughout the polyarylene sulfide. A crosslinking agent is combined with the other components of the composition following dispersal of the impact modifier throughout the composition. The crosslinking agent reacts with the impact modifier to form crosslinks within and among the polymer chains of the impact modifier. The compositions can exhibit excellent physical characteristics at extreme temperatures and can be used to form, e.g., tubular member such as pipes and hoses and fibers.

主权项

1. A polyarylene sulfide composition that is formed by melt processing (i) a linear polyarylene sulfide containing less than about 1 mol. % of cross-linking units based on the total monomer units of the polyarylene sulfide, (ii) from 20 wt. % to 35 wt. % of an epoxy-functionalized impact modifier, and (iii) from 1.0 wt % to 1.75 wt. % of a polyfunctional crosslinking agent that includes a dicarboxylic acid, wherein the crosslinking agent is supplied following distribution of the impact modifier with the polyarylene sulfide, and wherein the melt processing forms a crosslinked epoxy-functionalized impact modifier that is a reaction product of epoxy-functionalized monomer units and a polyfunctional crosslinking agent, and further wherein the polyarylene sulfide composition has a notched Charpy impact strength of greater than about 3 kJ/m2 as measured according to ISO Test No. 179-1 at a temperature of 23° C. and a notched Charpy impact strength of greater than about 8 kJ/m2 as measured according to ISO Test No. 179-1 at a temperature of −30° C., wherein the composition also exhibits a tensile elongation at break of about 70% or more as determined in accordance with ISO Test No. 527 at a temperature of 23° C. and at a speed of 50 mm/min.