Polycarbonate PC Resin

This polymer represents an important matrix for carbon fiber filled injection molding compounds and the molded parts have good tensile strength, impact strength and heat resistance. 

Carbon fiber-PC composites have been characterized [115] and the effect of toughness on compressive strength [116], tensile properties and fracture behavior determined when using PAN based carbon fiber [117]. 

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Polycarbonate (PC) Resins. Polycarbonates (qv) based on bisphenol A are sold in large quantities. Other bisphenols can be incorporated, but do not give the same favorable combination of properties and cost (82). Small quantities of PC based on tetramethylbisphenol A are used as blending resins (83) and polyester carbonate copolymers are used for appHcations requiring heat-deflection temperatures above those of standard PC resins (47). 

Boronic acids (69 and 70) (Fig. 45) with more than one boronic acid functionality are known to form a polymer system on thermolysis through the elimination of water.93 Specifically, they form a boroxine (a boron ring system) glass that could lead to high char formation on burning. Tour and co-workers have reported the synthesis of several aromatic boronic acids and the preparation of their blends with acrylonitrile-butadiene-styrene (ABS) and polycarbonate (PC) resins. When the materials were tested for bum resistance using the UL-94 flame test, the bum times for the ABS samples were found to exceed 5 minutes, thereby showing unusual resistance to consumption by fire.94... 

A new polymer modification process has been developed to reduce the cost of the engineering resin. The modification process is blended polymers. A blended polymer is a mixture of at least two polymers or a copolymer. There are three types of blended polymers miscible, immiscible, and compatible polymers. On occasion, blended polymers have properties that exceed those of either of the constituents. For instance, blends of polycarbonates (PC) resin and polyethylene terephthalate (PET) polyester were originally created to improve the chemical resistance of the PC. This is because PC actually had a fatigue resistance and low-temperature impact resistance that was superior to either of the individual polymers. 

Table 7 shows a polycarbonate (PC) resin which was treated with Tospeari to provide an improved light diffusing sheet (9). At only 40% of the barium sulfate level, the Tospeari treated sheet allowed more light through and the light was better dispersed than the conventional additive. The mechanical integrity of the PC sheeting was also retained as shown by the mechanical measurements. 

The following three studies were performed injection velocity study, adiabatic compression study, and plastication study. Each study is detailed in the discussion section prior to presenting the results. For the studies a high flow polycarbonate (PC) resin was used, which was dried prior to processing. The barrel temperature profiles used for each study are available in Table 1. With the exception of the compression study, each of the runs was stabilized for 15 consecutive shots before data was recorded for five consecutive shots. For the injection velocity study and the screw recovery study the melt temperature was also measured with a hand held intrusive probe. Directly following data collection the injection unit was retracted, the machine was manually purged, and the melt temperature was measured using a hand held probe that had been preheated to the barrel temperature. 

Other commercial thermoplastics include acrylonitrile butadiene styrene (ABS), cellulose acetate butyrate (CAB), polycarbonate (PC), nylon (PA), and acetals. These resins are frequently used in consumer applications. 

A dramatic improvement in the performance of PMDA in chain extension of PET is possible if the PMDA is added to the extruder in a concentrate using a polycarbonate (PC) carrier [10]. The reason being that if PMDA is compounded in a PET carrier resin then a premature reaction results leading to ultra-high MW PET and gel problems. Alternatively, if PMDA is compounded in a polyolefin carrier then degradation of the polyolefin occurs whereas, when PMDA is compounded in a polycarbonate carrier there is no premature reaction because PC contains no acid end groups (rather, -OH end groups instead). Furthermore, PC is quite miscible with PET. 

Core-shell emulsion polymers with a core or rubbery stage based on homopolymers or copolymers of butadiene are used as impact modifiers in matrix polymers, such as ABS, for styrene acrylonitrile copolymer methyl methacrylate (MMA) polymers, poly(vinyl chloride) (PVC), and in various engineering resins such as polycarbonate) (PC) poly(ester)s, or poly(styrene)s, further in thermosetting resins such as epoxies. 

Application A highly efficient process to produce bisphenol-A (BPA) from phenol and acetone. The BPA product is suitable for high-quality polycarbonate (PC) and epoxy resins applications, including optical-media grade PC. 

Electrical and electronic devices are made utilizing several various types of plastic materials, thus when discarded their waste is difficult to recycle. The plastics employed in housing and other appliances are more or less homogeneous materials (among others PP, PVC, PS, HIPS, ABS, SAN, Nylon 6,6, the pyrolysis liquids of which have been discussed above). However, metals are embedded in printed circuit boards, switches, junctions and insulated wires, moreover these parts contain fire retardants in addition to support and filler materials. Pyrolysis is a suitable way to remove plastics smoothly from embedded metals in electrical and electronic waste (EEW), in addition the thermal decomposition products of the plastics may serve as feedstock or fuel. PVC, PBT, Nylon 6,6, polycarbonate (PC), polyphenylene ether (PPO), epoxy and phenolic resins occur in these metal-containing parts of EEW. 

Blends of ABS and polycarbonate (PC) were commercially introduced by Borg-Wamer Co. (now part of GEC) several years ago [McDougle, 1967 Grabowski, 1964]. After an initial sluggish growth, these blends have now gained increased acceptance by resin fabricators and end users. Currently more than 50 Kton/y of ABS/PC blends are consumed in USA, Western Europe and Japan [SRI, 1992]. There are many suppliers of ABS/PC blends, primarily by those involved in producing the polycarbonate and/or ABS. 

Modification of Engineering Resins Specific interaction of the phosphonium ionomer from Exxpro elastomer with selected engineering resins such as Polycarbonates(PC), Polyesters(PET), Polyacrylates(PAE), Polyamides(PA), Polyphenylene Oxide(PPO), and Acetals(PAc) can be utilized to compatibilize, impact modify or nucleate the above resin in blends with similar polymers. Typical examples are ... 

TABLE 8.1. Conditions for MNP Synthesis by ion impiantation into Poiyvinyiidene Fiuoride (PVF2), Polyimide (PI), Polymethyl-methacryiate (PMMA), Poiymethyimethacryiate with Phosphorus-Containing Fragments (PMMA -1- PF), Polyethylene (PE), Poly(ethyleneterephthalate) (PET), Silicone Polymer (Phenylmethyl-silane Resin with Tin Diethyidicaprilate), Epoxy Polycarbonate (PC), and Polyetherimide (PEI) ... 

Polycarbonates are mainly used as a glazing material in construction (transparent roofing, impact-resistant glazing, sheet and for structural parts in building and construction). Greenhouses and the dome of the Sydney Olympic stadium all have PC sheet glazing. PC sheets are virtually unbreakable (bullet resistant windows, protective PC glazing panels). PC resins and BPA are known to be safe and they pose no health risk to humans. 

Details A solid in flake, crystal or dust form. Used in production of epoxy-phenolic resins, monomer of polycarbonates (PC), an antioxidant for PVC, and as an inhibitor used during PVC polymerisation. PC are widely used in many consumer products, from sunglasses and CD to water and food containers and shatter-resistant baby bottles. Some polymers can also contain bisphenol A, and epoxy resins containing bisphenol A are common coatings used in food cans. 

MAJOR APPLICATIONS Automotive, business machine, and electrical/electronics industries. PPO is mainly used to manufacture blends with high-impact polystyrene (HIPS). PPO/nylon, PPO/PBT, and PPO/polyolefin blends are also available on the mcuket. PPO based materials rank first in terms of total consumption among blends based on engineering resins such as nylon, polycarbonate (PC), polyacetal, and reinforced terephthalate polyesters (PET and PBT).( ... 

PC resin. See Polycarbonate PDB. See p-Dichlorobenzene PDBS. See Poly (dibromostyrene)... 

Synonyms PC PC resin Polycarbonate resin Classification Polyester... 

From TGA traces (see Figure 3.4) it can be readily seen that the cnred resins are much less thermally stable than Teflon or polycarbonate (PC). There is also an indication of a two-stage degradation for the cured DER 331 resin. From DTA traces for cured and uncured resins, it is shown that the characteristic exothermic peak between 300-380 °C is at least partially caused by some reaction of the epoxy group. 

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