Ultem polyetherimides

Table IV. Adhesion Promoting Agents for Polyetherimide (ULTEM 2312)...

Thermoplastic polyetherimide Ultem can be formulated with high temperature foaming agents such as 5-phenyldihydro-l,3,4-oxadiazinone to produce structural form products [99] by injection molding. PEI could be readily imbibed with various volatile organic compounds such as chlorinated hydrocarbons [100] and acetone [101]. 

Polyetherimide (ULTEM ) Methylene chloride, with or without a 1-5% solution of ULTEM , is recommended. Moderate pressures of 100-600 psi for 1-5 minutes are required (12). 

Materials. The amorphous matrix polymer was polyetherimide (Ultem 1000) sold by the General Electric Company. The semicrystalline matrices were PEEK and a high molecular weight polyphenylenesulfide (PPS) provided by ICI and Phillips Petroleum Co. (Barthesville, OK.), respectively. The reinforcing phase was one of several LCPs a liquid crystalline aromatic copolyester consisting of 73 %... 

Results of some of these short-term tests are shown in Table II. A comparison is given between PPS and five other plastics nylon (Zytel 101), polycarbonate (Lexan 141), polysulfone (Bakelite Polysulfone), polyphenylene oxide (Noryl), and polyetherimide (Ultem 2300). The data presented are based upon retention of tensile strength for all plastics except the Ultem 2300, which is based upon retention of flexural strength. Unsuccessful attempts were made to injection mold ASTM Type IV tensile bars out of the Ultem compound, but flexural strength bars could be made. Experience has shown that chemical resistance tests monitored by flexural strength retention are comparable to those monitored by retention of tensile strength. 

Figure 5 displays the ITPD curves determined at 90 °C of PEEK, PES, and PPS films [27]. Both sulfur-containing polymer films exhibit a pronounced charge drain-off within the first 180 min and hence cannot be considered as electret materials. PEEK, on the other hand, shows a moderate surface potential decay and maintains around 50% charge after 24 h at 90°C. The charge storage characteristics of commercial polyimides and polyetherimide (Ultem 1000) films at 90 °C are displayed in Fig. 6. Kapton HN (PI) films lose almost the complete surface potential within 24 h, exhibiting a steep decay in the first minutes. Upilex R renders better results, since its potential decay is moderate and after 24 h around 45% of the applied charge...

As mentioned in the introduction, the commercial polyetherimide Ultem 1000 reveals the most promising electret behavior among the other high performance polymers investigated. However, a chemically identical polyetherimide synthesized... 

Polyetherimide (Ultem 1000, GEC) is a high performance engineering thermoplastic with high heat distortion temperature (> 200°C), high mechanical strength and inherent flame-retardancy characteristics. Recently blends of polyetherimide with polycarbonate have been commercially offered as thermoformable sheets and as molding compounds (Table 15.28). The primary reason for... 

The plastic substrates employed in this study were injection-molded plaques (1.5 mm thick) or 125 )im thick extruded films prepared from unfilled Ultem polyetherimide (Ultem KXX)). In addition, plaques containing 10, 20, or 30 % glass-filler (Ultem 2112, Ultem 2212, or Ultem 2312, respectively) were used. All materials are available from GE Plastics. 

The substrates utilized in this study were 1.S mm thick, unfilled polyetherimide (Ultem 1000) injection-molded plaques and extmded films (12S pm thick). In addition, glass-filled plaques containing 10, 20,30,40, or SO % filler were employed. These latter materials are known commercially as Ultem 2112,2212,2312,2412, or 2512, respectively. All the materials are availabk from GE Plastics. 

Both polysulfone and the polyetherimide are thermojdaslics whieh withstand higher temperatures than epoxies such as DGEBA. The effect of (43) a polysulfone (Udel, 43a) and polyetherimide (Ultem, 43b) thermoplastics on the properties of a tetra-2,3-epoxypropylamine, N,N,N, N -tetra-2,3-epoxypropyl-, -bis(4-aminophenyl)-p-diiso-propenylbenzene (HPT Resin 1071,43c) has been studied and also the effect of these thermoplastics on the resin di-2,3-epoxypropyl-9,9-bis (hydro phenyl)fluorene (HPT Resin 1079,43d). Both these resins have a stiff backbone and were developed for use as amatrix resin for advanced composites. They can be cured with the aromatic dianune, -bis(3,5-dimethyl-4-aminophenyl)-p-diisopropylbenzene (43e). These resin curing agent combinations exhibit greatly improved hot/wet performaiKe over that of traditional epoxies. 

The materials examined included polycarbonate, polyetherimide (Ultem), polyamide-imide (Torlon), polysulfone (Udel), polyphenylene sulfide (Techtron), polyetheretherketone (PEEK)... 

They are easily bonded with epoxy or urethane adhesives however, the temperature resistance of the adhesives do not match the temperature resistance of the plastic part. No special surface treatment is required other than abrasion and solvent cleaning. Polyetherimide (ULTEM ), polyamide-imide (TORLON ), and polyethersulfone can be solvent cemented, and ultrasonic welding is possible. 

Over the past 15 years, many workers have reported on LCP blends and alloys with limited success at meeting the goal of improved performance-to-cost ratio. Figure 11.38 slows the tensile modulus of a number of LCP blends as a function of material cost [27]. Baird et al. [38] report that at LCP concentrations of greater than 40% and less than 90% in the polyetherimide Ultem , the tensile modulus of the blend is acmally higher than the pure LCP. This synergistic effect was noted for one particular type of blend and is attributed to partial miscibility and final blend morphology. 

PROPERTIES OF SPECIAL INTEREST Commercial polyetherimide (Ultem) is an amorphous... 

Pike, R. A., Pinto, J. P, and Brunett, C. M., Moisture Effects in a Polyetherimide— Ultem, Society of Plastics Engineers, 2d International Conference on Polyimides, Recent Advances in Polyimide Technology, 1985, pp. 92-101. 

GFCSS, a German company, developed a composite membrane on the basis of the above principle, a composite membrane that is illustrated schematically in Figure 10.27 [328]. The membrane consists of three layers. The first layer is a non woven polyester backing material. A porous membrane of polyetherimide (Ultem, General Electric) material is cast on the backing material by the phase-inversion technique. The porous membrane is further coated with... 

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