Polyetherimide alloys

Polyetherimide/polycarbonate alloys offer properties, processability and prices intermediate between those of polyetherimide and polycarbonate. 

PC/Polyester Alloy Polycarbonate Polyester - PCTG Polyetherimide... 

PC/Polyester Alloy Polyester - PBT Polyester - PET Polyester - PETG Polyetherimide Polyphthalamide Rigid PU... 

The miniaturization of PCBs has created the need for connectors to be made fi-om special materials suitable for shaping into thinner parts that can be packed into higher-destiny spaces and that can withstand higher soldering temperatures. Such materials available on the market include tailored grades of polyphenylene sulfide (PPS), PEEK, PET, polyetherimide, sulfone-based alloys, and liquid crystal polymers. Well-known commercial products are Rynite FR-530 and FR-945 modified PET grades of Du... 

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. 

Polyetherimide molding compounds are commercially available in extmsion and injection molding grades. The major suppliers of this material include GE Plastics (JJltem), Compound Technologies, DSM Engineering, LNP, and RTF A polyether-imide-polycarbonate alloy and a polyetherimide-silicone alloy are also available from GE Plastics. 

For applications where polycarbonate homopolymers or copolymers lack sufficient thermal performance, blends with polyetherimide (PEI) are often used. PEI, which also contributes excellent flammability and low smoke generation to the alloy, may be combined with either straight polycarbonate or polycarbonate blends, depending on what other properties are required. The most common uses are found in light reflectors for automotive headlamps, components for aircraft interiors (especially wall and ceiling panels), and food-contact applications for microwave-to-table cookware. 

RBS has also been used to characterize palladium and tin catalysts on polyetherimide surfaces [229], titanium nitride thin films [230], silicon oxynitride films [231], and silicon nitride films [232]. and to study the laser mixing of Cu-Au -Cu and Cu - W - Cu thin alloy films on Si3N4 substrates [233], and the annealing behavior of GaAs after implantation with selenium [234]. 

The authors suggest, based on this information, that a class of low temperature alloys such as In-Pb, Sn-Zn, Pb-Sn-Ag, Sn-Pb, Sn-Pb-Sb, Sn-Ag, Bi-Pb-Sn-Sb could be used as shielding materials. Other thermoplastics such as polyimide, polyetherimide, polyamideimide, polyphenylene sulfite, and PEEK are possible matrices as well. Recently a product which is a thermoformable EMI-shielding material has been introduced. It is made of solder-like low melting temperature bismuth-tin alloy and a non-woven EVA polymer. At 1 GHz its shielding effectiveness is claimed to be greater than 40 dB [3]. 

---