Design Guide - Solvay Plastics

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Therefore, large amounts of incident energy in the form of heat or ionizing radiation can be dissipated without chain scission or crosslinking taking place. Nonaromatic-backbone polymers do not similarly resonate, cannot absorb energy by this mechanism, and are therefore less stable. The diphenylene sulfone group thus confers on the entire polymer molecule, as inherent characteristics, thermal stability, oxidation resistance, and rigidity, even at elevated temperatures. To take full advantage of the potentially available contributions of the diphenylene sulfone structure in a thermoplastic resin, these units must be linked with other groups, which are thermally and hydrolytically stable, and which will contribute desirable processing and end use properties. Some flexibility in the backbone of the polymer is desired to impart toughness. This is provided by the ether linkage and moderately augmented by the isopropylidene link. These ether linkages also add to the thermal stability. Similarly, both the ether and isopropylidene linkages impart some chain flexibility, making the material more easily processable at practical temperatures. The chemical structure of polysulfone is thus directly responsible for an excellent combination of properties that are inherent in the resins – even without the addition of modifiers. Polysulfone is rigid, strong, and tough. It is transparent in its natural form and maintains its physical and electrical properties over a broad temperature range. Its melt stability permits fabrication by conventional thermoplastic processing and fabrication techniques. It is resistant to oxidation and thermally stable, and therefore, can tolerate high use temperatures for long periods of time. 2 Udel ® Polysulfone Design Guide www.SolvayPlastics.com
Product Data Material Selection Udel resins are amorphous sulfone polymers and offer many desirable characteristics, such as resistance to hydrolysis, thermal stability, retention of mechanical properties at elevated temperatures, clarity, and transparency. This material is available in both unfilled grades and glass-reinforced grades. The unfilled grades are available in a range of melt viscosities. Udel ® polysulfone is indicated when higher thermal capability, inherent flame resistance, better chemical resistance, and improved mechanical properties are required. The recommended maximum service temperature shown in Table 1 may help you position polysulfone among other engineering materials. Table 1: Temperature Limits of Some Engineering Materials Engineering Material Maximum Service Temperature °C °F Phenolic – general purpose 149-177 300-350 Polysulfone 140-160 284-320 Polycarbonate 121 250 Zinc die casting alloy 121 250 Modified polyphenylene oxide 93-104 200-220 Polypropylene 107 225 Polyamides 77-116 170-240 Polyacetal 85-104 185-220 The glass-reinforced grades offer higher stiffness and dimensional stability, with attendant benefits in creep resistance, chemical resistance, and lower thermal expansion. Udel ® polysulfone can be matched to a wide range of both transparent and opaque colors. Nomenclature The nomenclature system for Udel resins uses the prefix P to designate grades without reinforcement. Glassfiber-reinforced grades are designated with the prefix GF. The numerical string following the P is an indication of melt viscosity (molecular weight), with P-3500 LCD being the most viscous commercially available grade. P-3500 LCD is well suited for extrusion and microporous membranes. P-1700 is a mid-range viscosity material designed primarily for injection molding applications. Regarding glass-reinforced resin nomenclature, the last two digits of the numeric string following the GF prefix indicate the proportion by weight of glass-fiber reinforcement in the product. Udel GF-120, for example, represents a 20% glass-fiber reinforced polysulfone resin. A variety of stock and made-to-order colored Udel resins are available. Colors are designated with a suffix format of YY XXX where YY is the color indicator and XXX is a numeric string indicating a specific shade. For example, BK 937 indicates a resin that is black and 937 indicates a specific formulation. Packaging Udel ® polysulfone is available as free flowing pellets packaged in either 25 kg (55.115 lb.) bags or 500 kg (1,100 lb.) lined boxes. Superior thermal, mechanical, and chemical resistance properties relative to more conventional resins, have shown Udel ® polysulfone to be the best solution in many applications. These applications include: medical devices, electronics, electrical devices, appliances, plumbing, and general processing equipment. Please visit our web site at http://www.solvayplastics.com for additional examples of Udel ® polysulfone applications. Product Data Udel ® Polysulfone Design Guide 3
Page 1: Udel® Udel ® PSU Design Guide SPE
Page 4 and 5: Environmental Resistance. .........
Page 6 and 7: List of Tables Table 1: Temperature
Page 8 and 9: vi Udel ® Polysulfone Design Guide
Page 12 and 13: Approvals A number of organizations
Page 14 and 15: Table 2: Typical Properties (1) of
Page 16 and 17: Tensile Properties Tensile properti
Page 18 and 19: Figure 7: Glass Fiber Increases Fle
Page 20 and 21: After the impact the pendulum conti
Page 22 and 23: Long-Term Creep Properties The resp
Page 24 and 25: Thermal Properties The ways a mater
Page 26 and 27: Deflection Temperature Under Load O
Page 28 and 29: Thermal Conductivity Polymers in ge
Page 30 and 31: Combustion Properties UL 94 Flammab
Page 32 and 33: Thermal Stability Thermogravimetric
Page 34 and 35: Electrical Properties Many applicat
Page 36 and 37: Table 22: Short-Term Electrical Pro
Page 38 and 39: Figure 40: Tensile Elongation After
Page 40 and 41: Radiation Resistance Test specimens
Page 42 and 43: Stress Cracking Resistance To evalu
Page 44 and 45: Table 32: Environmental Stress Crac
Page 46 and 47: Table 34: Environmental Stress Crac
Page 48 and 49: Rockwell Hardness Rockwell hardness
Page 50 and 51: Design Information The rules for de
Page 52 and 53: Table 39: Area and Moment Equations
Page 54 and 55: A typical rib design is shown in Fi
Page 56 and 57: Stress Concentrations Classical mec
Page 58 and 59: Designing for Injection Molding Bec
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Bosses Bosses are protrusions off t
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Fabrication Drying Polysulfone must
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Injection Molding Figure 65: Screw
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Injection Rate and Venting The inje
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Regrind Sprues, runners, and discre
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Extrusion Udel ® polysulfone can b
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Purging Polysulfone can be easily p
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Secondary Operations Cleaning and D
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Finishing and Decorating Udel resin
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Solvent Bonding Solvent bonding is
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Figure 69: Boss Design for Self-Tap
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G Gates . . . . . . . . . . . . . .
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Specialty Polymers Worldwide Headqu
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