Polyphenylene sulfide, glass-filled

This paper Is concerned primarily with three basic grades of polyphenylene sulfide (1) 40X glass-filled polymer (Grade R-4),... 

The creep behavior of 40% glass-filled polyphenylene sulfide Is summarized In Figure 5 which plots creep modulus against time for three sets of experimental conditions 23°C/5,000 psi, 66°C/5,000 psi, and 121°C/5,000 psi. Table II compares the per cent loss In apparent creep modulus at 1,000 hours and at 10,000... 

The electrical properties of the three polyphenylene sulfide compounds are given In Table IV. The 40% glass-filled PPS Is the best Insulator as Indicated by the dielectric constant of 3.8. 

Table V Indicates the good retention of electrical properties exhibited by the 40% glass-filled PPS at temperatures up to 147°C. In addition, exposure of test specimens to 50 per cent relative humidity for 5 days did not cause any appreciable change In either dielectric constant or dissipation factor. Thus, environmental factors do not have much effect upon the electrical behavior of polyphenylene sulfide resins.

Results of smoke density measurements on 40% glass-filled polyphenylene sulfide are given in Table VII. These data indicate that PPS burns with the generation of a relatively small quantity of smoke. 

The effects of neutron and gamma radiation on the mechanical behavior of 40X glass-filled polyphenylene sulfide are summarized in Table X. These data indicate that this resin is quite stable to environments involving radiation. 

As a further comparison, the flexural modulus of glass-filled polyphenylene sulfide at 450° F is about 10 times that of unfilled polytetra-fiuoroethylene at room temperature. These data illustrate the outstanding retention of stiffness of this material at elevated temperatures. The heat-deflection temperature of polyphenylene sulfide containing 40% glass fibers is greater than 425°F, accounting for the excellent retention of mechanical properties at elevated temperatures. 

Polymer Specimens. The materials used in this work were polyimide (PI),polyamide-imide (PAl), polyether-ether-ketone (PEEK), polyphenylene sulfide (PPS) and polyether sulphone (PES). The chemical formulas and physical properties of the specimen polymers are summarized in Table I. The specimen polymers, except PPS, were unfilled while the PPS specimen was filled with glass fiber of Uo wt. %. PAI and PES are amorphous polymer with considerably high glass temperature. The polymers, except PI, can flow at hi temperatures and allow the use of injection molding. 

Polyphenylene sulfide is a high temperature, stiff, fire-resistant, chemically resistant plastic, which has a very low melt viscosity and accepts fillers and reinforcing agents very well. Talc, china clay, dolomite, quartz and glass fibre filled grades are all available but volumes are very small and the situation changes very rapidly. 

Janick and Kroliskowski [40] investigated the effect of Charpy notched impact strength on the flexural modulus of polyethylene and polyethylene terephthalate. Polymers with good flexural modulus include polydiallylisophthalate (11.3 GPa), phenol-formaldehyde (6.5 GPa), alkyd resins (8.6 GPa), and polyphenylene sulfide (13.8 GPa), as well as glass-filled polyester laminate (16 GPa) epoxy resins (3-3.5 GPa), sUica-fiUed epoxies (15 GPa), and acetals containing 30% carbon fiber (17.2 GPa). 

Titanium, unalloyed 36. Polyphenylene sulfide (40% glass-filled)... 

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