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1. Introduction |
Polyphenylene sulfide (PPS) is a crystalline engineering plasticpossessing a molecular structure of benzene rings linked withsulfur atoms. The melting point of PPS is 280-290℃ and it can beutilized continuously at a temperature of 200-240℃. Thisoutstanding heat resistance classifies the resin as an advancedengineering thermoplastic (ETP). PPS also exhibits excellentmechanical properties and dimensional precision, while the resinitself exhibits flame retardance. In addition, there are no organicsolvents that can dissolve PPS at a temperature of lower than 200℃.The resin has chemical resistance on a par with fluororesins. |
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Nowadays, moves to avoid materials containing halogenated flameretardants for use in IT devices such as smartphones and personalcomputers are gaining traction centered on the efforts of Westernmanufacturers and many cases are emerging where grades of PPScontaining low levels of chlorine are sought.
Conventionally, PPS is synthesized using the process shown inFigure 1. Para-dichlorobenzene is used as a feedstock and thisnormally results in 500-5,000 ppm of chlorine remaining in thefinal product in the forms of residual chlorine at the polymerchain ends and byproduct sodium chloride. As long as the process inFigure 1 is used to manufacture PPS, one can predict thatproductivity would decline if attempts were made to drasticallyreduce the level of chlorine in the PPS and costs would alsoincrease dramatically through the addition of process steps.Consequently, the consensus is that it would be very difficult toachieve a chlorine level of less than 900 ppm that would satisfymarket needs.