Poly sulfones properties

Property Acetal Polycar- bonate Polyphe- nylene Oxide Poly- sulfone Nylon 66... 

PA/PSF with poly(sulfone-g-lactam) processability and mechanical properties McGrath and Matzner, 1972... 

Immiscible PES blends with improved properties are composed from poly-(biphenyl ether sulfone) and poly(l,4-phenylene ether sulfone). Ternary resin blends comprising a poly(biphenyl ether sulfone), a poly(ether sulf-one) and a poly(sulfone), exhibit very attractive thermal and environmental resistance characteristics together with excellent mechanical properties. 

The desirable properties of Pis and poly(sulfone)s can be combined into a single resin, such as in a poly(etherimide sulfone)." These resins have low levels of residual volatile species and low levels of reactive groups. Thus articles may be prepared from these resins, which are essentially free of voids, bubbles, splay, silver streaks or other imperfections. Monomers that introduce the sulfone group into the polymer are shown in Table 15.4. 

Poly(sulfone) has the characteristic properties such as chemical inertness, excellent strength, stiffness, high resistance to radiations and temperature, dimensional stability, and biocompatibility [2,16,56], These properties resemble the properties of light metals [57], Further, the properties of poly(sulfone) do not change during... 

Homopolymers derived from MDI and azelaic acid are semicrystalline engineering plastics with a Tg of 135°C and a Tm of 290°C (88). Copoljrmers of MDI with azelaic acid, containing 20-30 mol% of adipic acid show a eutectic Tm of approximately 240°C. These amorphous or slightly crystalline copolymers have mechanical properties comparable to transparent nylons or polycarbonates. Although injection molded samples are transparent, they will crystallize and turn opaque. Copolyamides derived from MDI and aromatic dicarboxylic acids are more difficult to prepare. Because of the very high Tm (420°C) of the isophthalic acid/MDI block it was necessary to prevent the formation of any appreciable ciystalline blocks, which was accomplished by prereacting a portion of the isophthalic acid (15-20 mol%) with 2,4-TDI. In this manner crystallization of the isophthalic acid/MDI blocks was surpressed (89). Thus, copolyamides containing IPA/azelaic acid (50 50) are obtained with thermal and mechanical properties similar to poly-sulfone. 

The aromatic sulfone polymers are a group of high performance plastics, many of which have relatively closely related structures and similar properties (see POLY-SULFONES). Chemically, all are polyethersulfones, ie, they have both aryl ether (ArOAr) and aryl sulfone (ArS02Ar) linkages in the pol5uner backbone. The simplest polyethersulfone (5) consists of aromatic rings linked alternately by ether and sulfone groups. 

Of the GRTP only ABS, polypropylene, poly-sulfone, and modified phenylene oxide are electroplated. Of these ABS represents about 85% of the market. Since the introduction of platable plastics, new formulations have been developed to give superior physical properties, platability, and appearance. For example, 25% glass-filled ABS has a shrinkage nearly equal to that of die-cast metals the increased stiffness reduces distortion during the plating operation and a reduction of 50% in the coefficient of linear thermal expansion permits it to pass the standard thermal cycling test of 82 to -40 C (190 to - 40 F) (Ref. 29). 

In order to solve the problems that occurred with unmodified cellulosic membranes, synthetic membranes were developed. The first synthetic polymeric membrane was produced in the early 1970s. Since that time, various synthetic polymers such as poly-sulfone, polyamide, poly(methyl methacrylate), polyethersulfone, polyethersulfone/ polyamide have been used in the production of synthetic hemodialysis membranes [20,21]. Synthetic membranes have large mean pore size and thick wall structure. These properties provide high ultrafiltration rate, which is necessary for hemodialysis to be achieved with relatively low transmembrane pressures [20]. The main difference in synthetic and cellulosic membranes is the chemical composition of the membrane. Synthetic membranes are made from manufactured thermoplastics, while both modified and unmodified cellulosic membranes are prepared from natural polymers [20]. 

Polysulfones are self-extinguishing resin. Polysulfones with no flame retardant additives has been given 94V-0 under the UL Standards. The value of limited oxygen index (around 0.40) points out their excellent flame retardancy [109]. Furthermore, exposed to flame, polysulfones emit very little smoke or toxic volatiles. However, the high flameproof properties of polysulfones are scanty when they are used as electriccd parts or in an epoxy resins network. Poly(sulfone) (PSF) and p>oly(ether sulfone) (PES) are commonly used for high performance applications such as advanced... 

Combining ZIF-8 437 silicalite-1 in poly-sulfone Udel P-3500 (ZIF-8/S1C-PSF MMM) did not improve the separation results compared to either SIC-PSF or ZIF-8-PSF alone in MMMs for CO2/CH4 and CO2/N2 gas mixtures. The relatively large silicalite-1 crystals probably could not be intercalated between small ZIF-8 particles. ZIF-8 alone produced the highest increase of CO2 permeability, which can be attributed to its textural properties and its small particle size, which however gave poorly dispersed aggregates. For O2/N2 and H2/CH4 gas separation, a ZIF-8-PSF MMM produced the best selectivity-permeability results compared to a Cu-BTC or SIC-PSF MMM. This may be due to an increase in free volume (as suggested for ZIF-8-polyimide MMMs) " together with an efficient molecular separation effect (based on diffusion differences) because of the small pore aperture window of ZIF-8 (3.4 A, 0.34 nm) compared to Cu-BTC (6 A, 0.6 nm) and SIC (5.5 A, 0.55 nm). ... 

Polysiloxane polyether copolymer. See Dimethicone copolyol Poly (sodium metaphosphate). See Sodium metaphosphate Poly (sodium styrenesulfonate) Poly (sodium p-styrenesulfonate). See Sodium polystyrene sulfonate Polysodium vinyl sulfonate Synonyms PSVS Sodium vinyl sulfonate polymerized Classification Polymer Definition Polymer of sodium vinyl sulfonate Properties M.w. 10,000... 

Properties Unfilled 20% glass-fiber- reinforced Unfilled 20% glass-fiber- reinforced Poly(ether sulfone) Poly(phenyl sulfone)... 

Sulfonation has been used to change some characteristics of blends. Poly(2,6-diphenyl-l,4-phenylene oxide) and polystyrene are immiscible. However, when the polymers were functionalized by sulfonation, even though they remained immiscible when blended, the functionalization increased interfacial interactions and resulted in improved properties (65). In the case of DMPPO and poly(ethyl acrylate) the originally immiscible blends showed increased miscibility with sulfonation (66). 

There has been considerable research on chlorine-resistant RO membranes (48—52). A poly(/n j -2,5 dimethyl)pipera2inthiofura2anainide used in the presence of low (3 mg/L) concentrations of chlorine resulted in a membrane life of three years (48). A copolyamide hoUow-fiber membrane for use in desalination has been developed that is resistant to 0.5 mg/L chlorine (49). Millipore Corporation has also developed a sulfonated polysulfone member that has desirable chlorine-resistance properties. 

Some commercial durable antistatic finishes have been Hsted in Table 3 (98). Early patents suggest that amino resins (qv) can impart both antisHp and antistatic properties to nylon, acryUc, and polyester fabrics. CycHc polyurethanes, water-soluble amine salts cross-linked with styrene, and water-soluble amine salts of sulfonated polystyrene have been claimed to confer durable antistatic protection. Later patents included dibydroxyethyl sulfone [2580-77-0] hydroxyalkylated cellulose or starch, poly(vinyl alcohol) [9002-86-2] cross-linked with dimethylolethylene urea, chlorotria2ine derivatives, and epoxy-based products. Other patents claim the use of various acryUc polymers and copolymers. Essentially, durable antistats are polyelectrolytes, and the majority of usehil products involve variations of cross-linked polyamines containing polyethoxy segments (92,99—101). 

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