Polycarbonate structure

Figure 3. NBS Smoke Chamber results (non-flaming) for two grades of polycarbonate structural foam. Continued on next page.

Since the early days of polyurethane discovery, the technology has focused on isocyanate reactions with polyesters or polyethers. The differences will be discussed in later sections. These reactions are responsible for the growth of the polyurethane industry. The polyesters of interest to polyurethane chemists terminate in hydroxyl groups and are therefore polyols produced by the polycondensation of dicarboxyhc acids and polyols. An example is a polyol with a polycarbonate structure (Figure 2.3). 

Analogously the bisphenol A polycarbonate structure has been modified by incorporating ether group-containing units of the formula ... 

Fig. 8. Sierracin lightweight, biidproof F-lll windshield cross section (43). A, 3.0-mm as-cast acrylic face ply B, S-100 silicone intedayer C, fiberglass retainer D, 6.4-mm polycarbonate structural ply E, S-120 polyurethane intedayer F, stainless steel bearing strip and G, stainless sted bushing.

Most laminated safety glazings are glass—PVB—glass trilayer composites, but bullet- and projectile-resistant laminates. Laminates for other specialty uses may be made with more than three layers. In addition to glass, poly (ethylene terephthalate) (PET), acrylic, and polycarbonate structural components (92) are used in specialty laminated glazing products. 

Makrolon SF. [Bayer Miles] Polycarbonate structural foam. 

Standard polycarbonate, (PC), is made from bisphenol A and phosgene via an interfacial polymerization process. The polymer backbone has an aromatic polycarbonate structure with a recurring carbonate, moiety which, uniquely accounts for the outstanding toughness of the polycarbonate and the rigid aromatic unit contributes to its high glass transition temperature. 

It is demonstrated that when the NS concentration in the material decreases, thermal capacity goes up which is confirmed by the results of previous investigations. Thermal conductivity decline, when the NS concentration decreases, is apparently caused by the material defectiveness When Cu/C nanocomposites are introduced into the modified material, the NS can be considered as the generator of molecules excitation, which results in wave process in the material. It is found that polycarbonate modification with metal/carbon containing nanocomposites results in the changes in polycarbonate structure influencing its optical and thermal-physical properties. 

At higher temperatures (500-700 C) other decomposition reactions are observed, with formation of open-chain compoimds whose structures originate from molecular rearrangements or decomposition of the polycarbonate structural unit (Scheme 5.8). 

Polycarbonate is a thermoplastic material used in many applications, including microchips. The aromatic rings in the polycarbonate structure offer a relatively easy way to modify the PC surface by a direct sulfonation reaction. After cleaning with isopropyl alcohol, the polycarbonate surface is modified by reaction with sulfur trioxide at 50 °C for 10 min. Then it is rinsed with water and dried in a stream of nitrogen. 

The generation of gases takes place linearly over large dose range (Table 45) [OONl]. The largest amounts of carbon monoxide can be explained by the remote of carbonyl units from polycarbonate structures. 

Over 95% of EVOH resins are processed in multi-layer coextruded systems. A vast majority of these systems are five-layer or greater and utilize polyolefin layers in a major portion of the structures. Nylon, PET and polycarbonate structure are also used. Frequently, nylon polycarbonate and polystyrene are used in combination with polyethylene or polypropylene in the same structure with EVOH resins. 

Polycarbonate/ acrylonitrile-butadiene-styrene copolymer or aciylonitrile-ethylene-propyl-ene-styrene alkyl vinyl ethers copl5rmer, PC/ABS or AES (ABS or AES/polycarbonate) STRUCTURE Dispersed... 

The authors of Refs. [7, 8] considered the typical amorphous glassy polymer (polycarbonate) structure change within the frameworks of solid body synergetics. 

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