Polyphenylene sulfide mechanical

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. 

Ryton Polyphenylene Sulfide is a new commercial plastic which is characterized by good thermal stability, retention of mechanical properties at elevated temperatures, excellent chemical resistance, a high level of mechanical properties, and an affinity for a variety of fillers. It is produced from sodium sulfide and dichlorobenzene. Its unusual combination of properties suggests applications in a variety of molded parts such as non-lubricated bearings, seals, pistons, impellers, pump vanes, and electronic components. Tough coatings of polyphenylene sulfide can be applied to metals or ceramics by a variety of techniques and are used as protective, corrosion-resistant coatings in the chemical and petroleum industries. Incorporation of small amounts of polytetrafluoroethylene provides excellent non-stick properties in both cookware and industrial applications. 

Polyphenylene sulfide also retains good mechanical properties at elevated temperatures, as illustrated in the plot of flexural modulus (a... 

Blends of PET/HDPE have been treated previously in the literature [157, 158]. These are immiscible, but the addition of compatibilizers improves the mechanical properties of the blend, such as styrene-ethylene/butylene-styrene (SEBS) and ethylene propylene diene monomer (EPDM) [157], MAH [158], Poly(ethylene-stat-glycidyl metha-crylate)-graft-poly(acrilonitrile-stat-styrene) (EGMA), poly (ethylene acrylic acid), and maleated copolymers of SEBS, HDPE, ethylene-propylene copolymer (EP). The addition of compatibilizers modifies the rheological properties of blends of PET with HDPE, in such a way that increases in viscosity are observed as the component interactions augment. Changes in crystallization of PET were evaluated in blends with Polyphenylene sulfide (PPS), PMMA, HDPE aromatic polyamides, and copolyesters [159]. 

Polyphenylene sulfide (PPS) is known for its dimensional stability, toughness and rigidity. PPS can be sterilised repeatedly and can be exposed to strong disinfectants without damage. PPS has been used to replace metal in the precision mechanical elements of drug delivery systems. 

Thermoplastic matrices, is particularly attractive for automotive applications PP, for example, is economical, it can be processed quickly and can provide much better mechanical properties such as impact resistance, (i.e., bumpers, body panels [11]). PA are successfully applied in both under hood (i.e., inlet manifolds, radiator fans) and interiors (instrument panels, doors, front-end structures). For better temperature performance and mechanical properties, in some special application areas (motor racing sector, gearbox parts), polyether ether ketone and polyphenylene sulfide ( high performance thermoplastics ) are also used as matrices. 

Perng [5] also used stepwise Py-GC-MS and TGA-MS techniques in a study of the mechanisms and kinetics of the thermal decomposition characteristics of polyphenylene sulfide at various temperatures between ambient and 900 "C. The major decomposition products were benzene thiol, hydrogen sulfide, benzene and carbon disulfide always being the dominating component. 

Engineering thermoplastic resins (ETP) are those whose set of properties (mechanical, thermal, chemical) allows them to be used in engineering applications. They are more expensive than commodity thermoplastics and generally include polyamides (PA), polycarbonate (PC), linear polyesters such as polyethylene terephthalate (PET) or polybutylene terephthalate (PBT), polyphenylene ether (PPE) and polyoxymethylene (POM). Specialty resins show more specialized performance, often in terms of a continuous service temperature of 200°C or more and are significantly more expensive than engineering resins. This family include fluoropolymers, liquid crystal polymers (LCP), polyphenylene sulfide (PPS), aromatic polyamides (PARA), polysulfones (P ), polyimides and polyetherimides. 

Nam and coworkers [27] used dynamic mechanical analysis to measure the heat distortion temperature of polyphenylene sulfide/acrylonitrile-butadiene styrene. 

Polyphenylene sulfide opens up new possibilities in aerospace, chemicals, electronic, food, and transportation applications [86], Thermoformed polyphenylene sulfide, in addition to its excellent mechanical properties (Table 3.2), can tolerate high tanpera-tures for prolonged periods of time. Thus, umeinforced polyphenylene sulfide has a thermal index of 186°C, and glass fiber-reinforced polyphenylene sulfide has a thermal index of 220°C. 

He reported that polymers prepared in this manner generally contained more than one sulfur atom per repeat unit (x in the range 1.2-2.3). In addition the polymerization reaction was highly exothermic and difficult to control, even on a small scale.7 Certainly Macallum s work sparked an interest in polyphenylene sulfide (PPS) and triggered a series of investigations that eventually led to the commercial production of PPS. In 1954 Macallum sold his patents to Dow Chemical Co. where this polymerization scheme was studied further. However, the problems associated with the severe polymerization conditions and control of the exothermic reaction remained largely unsolved.9 Lenz and coworkers at Dow have studied the mechanism of the Macallum polymerizationlO and the structure of the polymer produced, ii The structure postulated consists of a crosslinked core to which are attached more or less extended, linear chains. 

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