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PPS

Overview

Along with advancement in the industry, demands for high performance polymer materials with heat resistance, chemical resistance, and the like are increasing in many fields. In particular, as automobiles and electric and electronic parts are becoming more compact, light in weight, and highly efficient, materials with heat resistance, chemical resistance, and high rigidity are demanded. In addition, as environmental issues have forced thermosetting resins to be replaced with recyclable thermoplastic resins, demand for PPS resins with electrical stability, dimensional stability and high performance properties are growing.

Features

PPS resins melts at 280¡É and has excellent chemical resistance. It retains flame resistance in itself and can be flame resistant without flame retardants, so it can be called friendly to environment flame resistance resins. Generally, it is used with 40 percent to 65 percent of glass fiber or inorganic materials being added, and it has outstanding properties as the following:
  1. heat resistance
  2. excellent flexural strength and flexural modulus
  3. self flame resistance
  4. excellent dimensional stability
  5. chemical resistance
  6. excellent electrical properties
  7. precision moldability


Classifications

Generally, PPS resins are used as a type of compounds reinforced with 40 percent to 65 percent of glass fibers or various inorganic materials. The general physical properties of typical compounds are as shown in Figure 1.



1) Chemical Resistance

PPS resins has exceptional resistance even at high temperatures to a variety of chemical stimuli such as strong acids and bases, organic solvents, fuel liquids, engine oils, transmission oils, and the like. Thanks to this property, PPS resins are not dissolved easily in chemical solvents at temperatures below 200¡É

Table 1. Chemical Resistance of PPS



2) Thermal Property

Figure 2 shows the coefficients of linear expansions according to the changes in temperature. Like general glass fiber reinforced products, the coefficient of linear expansion varies according to the orientation of glass fiber. If the orientation of a product is not severe, it has a medium level of coefficient of linear expansion, and in this case, it has a similar value with the coefficient of linear expansion of aluminum, which amounts to about 2.4 ¡¿ 10-5cm/cm ¡É.



Properties

Our PPS resins consist of general grade, which is reinforced with 40 percent of glass fiber and with 65 percent of glass fiber and inorganic materials, and specialty grades such as high impact grade, low flash grade, and wear resistance grade.

1) General Grade

    It is a representative grade of PPS resins and consists of two products: XP-2140, which is reinforced with 40 percent of glass fiber, and XP-2165M, which is reinforced with 65 percent of glass fiber and inorganic materials.
2) Low Flash Grade

    Unlike other resins, general PPS resins has low shear stress dependency so that it still has very low viscosity in the low shear stress area and can generate flashes (or burrs) in injection processing. To solve this problem, low flash grade has been offered, and Figure 3 shows to what extent XP-2165B developed with our own technology improved the generation of flashes.


3) High Impact Grade

    It is a grade that improved the impact resistance of PPS resins, one of its weaknesses. Though PPS resins have excellent mechanical strength, they can be easily brittle by instantaneous impacts. Our high impact PPS resin, XP-2135IM, has exceptional impact resistance compared with the high impact grades of other companies.
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