Polycarbonates commercial grades

The range of polycarbonates commercially available has increased greatly in recent years. The main differences between these grades are largely due to ... 

The TMC polycarbonate homopolymer has a glass transition temperature of 238°C, nearly 100°C above that of the bis-phenol A polycarbonate. Therefore, copolymers will have intermediate glass transitions depending on the relative proportions of TMC and bis-phenol A. Commercial grades (marketed by Bayer as Apec HT) have Vicat softening points from 158 to... 

Comparatively little information is available concerning the use of additives in commercial grades of polycarbonate. Pigments, heat and ultraviolet stabilisers, blowing agents and fire retardants are used but the range of materials available... 

Table 15.5. Properties of commercial grades of ABS/polycarbonate vs, polycarbonate...

The commercial grades of polyamide/polycarbonate blend (Dexcarb ) exhibit high notched Izod impact strength comparable to that of impact modified polyamides and polycarbonate (Table 15.24). It is believed that an elastomeric impact modifier was included in these compositions. Patent claims the use of a polyetheramide and a maleated polypropylene or EPR as the compatibilizing/ impact modifying additives [Perron, 1988]. The commercial grades contain varying amounts of PC, PA-66 (or 6) and the impact modifier. 

Table 15.26. Properties of some commercial grades of PBT/polycarbonate blends...

Since the early discovery of miscibility between the low-cost polystyrene and PPE, several commercial grades of PPE/HIPS have been developed, which offer a wide choice of heat resistance (DTUL), impact strength, and melt processability (Cizek 1969 Fried et al. 1978). This versatility of PPE/HIPS blends led to their unparalleled commercial success, accounting for nearly 50 % of market volume of all engineering polymers commercial blends. PPE/HIPS blends filled the price-performance gap between the styrenic resins (HIPS, ABS) and the engineering resins such as polycarbonate, polyarylate, and polysulfones. The technology of PPE/HIPS blends has already been discussed previously under the styrenic blends section (Sect. 19.3), and the typical blend properties are shown in Tables 19.6 and 19.32. 

Table 10.5. Properties of a typical commercial grade of polycarbonate.

Commercial grades of unfilled Nylon 6,6 and polycarbonate resins were used. For preparation of Nylon test coupons, the samples were molded and remolded up to 10 consecutive molding cycles in an injection molder to simulate resin re-use. For the polycarbonate resins, molded pellets from a commercial resin reprocessor were used and compared to virgin. 

The viscosity data for several different molecular weight grades of commercial polycarbonate resin are shown in Figure 4. From this plot the relative processability of these materials can easily be determined by comparing their viscosities at the shear rates used in processing. 

Reinforced plastics are composites in which a resin is combined with a reinforcing agent to improve one or more properties of the resin matrix. The resin may be either thermosetting or thermoplastic. Typical thermosetting resins used in RPs include unsaturated polyester, epoxy, phenolic, melamine, silicone, alkyd, and diallyl phthalate. In the field of reinforced thermoplastics (RTFs), virtually every type of thermoplastic material can be, and has been, reinforced and commercially molded. The more popular grades include nylon, polystyrene, polycarbonate, polyporpylene, polyethylene, acetal, PVC, ABS, styrene-acrylonitrile, polysulfone, polyphenylene sulfide, and thermoplastic polyesters. 

Commercially available bisphenol A polycarbonate (molding, extrusion grade-from General Electric Co.,... 

Electroplating chemicals n. Copper, gold, silver, chromium, and nickel are generally used as the conductive metal for plating. Acrylonitrile-butadiene-styrene resins have been most widely used for electroplated articles. Others in commercial use for the process include cellulose acetate, some grades of polypropylene, polysulfones, polycarbonate, polyphenylene oxide, nylons, and rigid PVC. 

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