Polyarylene Sulfide PPS

Polyarylene sulfides (PPS), (-(j)-S-)n, was commercialized in 1971 as Raytori R. The resin is semicrystalline with Tg = 194 °C and T = 288 °C thus Tprocess 290 °C. PPS is difficult to mold - it tends to adhere to the mold surface and to flow into mold crevices. It has also relatively poor impact resistance. Blends have been developed to alleviate these problems, e.g., with 25 wt% of either PSF, PPE, or PC (BaUey 1977). Commercial PPS blends are available with PPE (e.g., DlC PPS commercialized in 1982, NoryF APS), PARA (RTP 1300), or PTFE (Lubricomp PPS). They show good processability with reduced flash, are tough, excellent wear, as well as high heat, solvent, chemical, and oxidation resistance. 

PPS has been frequently blended with PSFs. The latter resins are mainly amorphous, frequently transparent, with Tg = 196-288 °C, able to maintain high-performance characteristics over a wide temperature range, but poor weatherability, notched impact strength, and ESCR. The PPS/PSF blends have been developed to improve PPS processability and/or the mechanical performance over a wide range of temperatures, to improve PSF weatherability, impact, and ESCR characteristics. Evolution of these blends is outlined in Table 1.70. 

PArs are aromatic amorphous polyesters, viz., U-polymer , Ardel D-lOO, Durel , Arylon , etc. Their Tg 188 °C and HDT = 120-175 °C. Blends with 

vinyl-terminated PDMS, Tensile, flexural, and notched Izod Arkles 1983, 1985 

PET with PDMS and MASS Impact and embrittlement resistance Sauers and Barth 1970 

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Polyarylene sulfide PPS 170 280- 288 194 PPE, PC, PTFE, PSF, PAr, PARA, PI, PAI, PEK, LCR PAES, PPSS, PDMS, FER PCTFE, PTFE, PVDF Diverse aromatic Rayton ... 

To improve on Ryton PPS, Phillips introduced a family of high-temperature performance polyarylene sulfide (PAS) polymers. The crystalline form, PASl, is said to be suitable for structural components at... 

Compatibilized blends of polyarylene sulfide with epoxy-functimialized polydimethylsiloxane have been prepared by Han (1994). An amine-terminated polysiloxane was functioned in solution with a chloro-epoxy triazine. Blends of 95 5 PPS polysiloxane were extruded at 130-290 °C to provide compositions with markedly improved mechanical properties compared to a similar blend containing unfunctionalized polysiloxane. 

Compatibilized blends of polyarylene sulfide with SEBS-g-MA have been prepared by Hisamatsu et al. (2000). Possibly an amine-terminated PPS reacts with anhydride to form a compatibilizing copolymer. Blend properties were measured as a function of MA content on SEES. Nam et al. (2003) prepared compatibilized blends of PPS with ABS-g-MA in a TSE. Blends were characterized using optical microscopy, SEM, FTIR, DMA, and heat distortion temperature. 

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