Physical properties of polycarbonates

Table 15.7 Thermal and Physical Properties of Polycarbonates (Typical Values)...

TABLE 1. Physical Properties of Polycarbonate Prepared Using Bisphenol A, 3,3-bis(4-hydroxy-phenyl)-l-phenyl-lH-indol-2-one, and Phosgene Dissolved in C Cb/Chlorobenzene at Ambient Temperature... 

Physical properties of polycarbonates derived from diphenyl carbonate, and isosorbide and/or bisphenol and those derived from bismethylsalicylcarbonate, (1), bisphenol A and/or isosorbide are provided in Tables 1 and 2, respectively. 

TABLE 2. Physical properties of polycarbonates obtained from the reaction of bisphenol A and isosorbide with bismethylsalicylcarbonate, (I). 

Exposure to an ozone-air mixture (2 10 parts ozone to 1 part air) does not cause changes in the physical properties of polycarbonate, even after more than six months at room temperature or after three months exposure to pure oxygen at 20 bar and 70 °C. Under long-term storage in air, polycarbonate will yellow at relatively high temperatures as a function of temperature and time, see Section 5.4.3.3. 

How does the molecular architecture of the bisphenol molecule affect the physical properties of the final polycarbonate polymer ... 

Thorat SD, Phillips PJ, Semenov V, Gakh A (2003) Physical properties of aliphatic polycarbonates made from CO2 and epoxides. J Appl Polym Sci 89 1163-1176... 

The gas-polymer-matrix model for sorption and transport of gases in polymers is consistent with the physical evidence that 1) there is only one population of sorbed gas molecules in polymers at any pressure, 2) the physical properties of polymers are perturbed by the presence of sorbed gas, and 3) the perturbation of the polymer matrix arises from gas-polymer interactions. Rather than treating the gas and polymer separately, as in previous theories, the present model treats sorption and transport as occurring through a gas-polymer matrix whose properties change with composition. Simple expressions for sorption, diffusion, permeation and time lag are developed and used to analyze carbon dioxide sorption and transport in polycarbonate. 

Direct reaction of castor oil with 4,4 -methylenebisphenyl diisocyanate gave standard polyurethane material [52]. In efforts to modify the physical properties of the polymer, castor oil was mixed with trimethylol propane (a common industrial building block) and the stoichiometric ratios of the diisocyanates involved were varied [53], The reaction in this instance displayed second order kinetics. Polycarbonate-urethanes were also produced from... 

The excessive crystallinity In 4 4 -methylene blsphenols also lends Itself to modification by another method viz. disruption of the polymer chain with Isomeric blsphenols In order to diminish symmetry and hence produce a workable useful polycarbonate. While en >loyment of this technique with 4 4 -dlhydroxy-dlphenyl methane (BF) was previously found to produce workable copolymers they were not useful because of low glass transition temperatures (20). Other physical properties of the polymer were gulte good however. 

Polycarbonate (PC) has excellent mechanical strength, particularly impact strength, good electrical properties and transparency, and is widely utilised in a variety of fields including office machinery, electric and electronic machinery, automobiles, architecture and so on. Many applications require that a PC composition be flame retardant(s) (FR) and combine ease of processing with good optical properties. Table 2.7 illustrates some of the physical properties of PC. 

While such rigid poljdmides have enjoyed tremendous commercial success based on good physical properties, the difficulties in processing them have hmited their apphcations. It was, therefore, desirable to find a method to produce polymers that combined the excellent physical properties of traditional polyimides with the simple melt processabihty of other thermoplastics, such as polycarbonates, polyesters, or polyamides. 

Design calculations used with polycarbonate resin are no different from those for any other thermoplastic material. Physical properties of all thermoplastics are dependent on the expected temperature and stress levels as defined by the application s end-use environment. Standard engineering calculations can be used to predict part performance for polycarbonates. It is important to take into account the notch sensitivity inherent to... 

Table 1 Some Physical Properties of Tyrosine-Derived Polycarbonates ... 

Aromatic thermotropic liquid crystal polyesters (Ar-TLCP s) and TLCP s containing aliphatic linkages can be compatibilized as binary-TLCP blends by transesterification. The morphology and physical properties of the resultant binary-TLCP blend are dependent on the blockiness, composition and viscosity ratios of the two TLCP components. Polycarbonate (PC) can also be blend compatibilized with either TLCP s or binary-TLCP blends, by transesterification of aliphatic linkages from the TLCP s into the PC. In this work, the degree of selective transesterification is quantified and its effect on TLCP blend compatibility is described... 

Table 4.6 Physical properties of nano-lubes in polycarbonate...

TABLE VI summarizes the physical properties of the polymers. The values of the acrylonitrile-butadi-ene-styrene(ABS) resin and of polycarbonate are included for the sake of comparison. The norbomene polymers have good tensile and flexual properties comparable to those of the ABS resin. The heat distortion temperature (HDT) of poly(5-norbornene-2-nitrile) is raised by... 

Abstract This chapter reports numerical models devoted to predict the optical and vibrational properties of nanoparticles treated as isolated objects or confined in host matrixes. The theoretical data obtained by the numerical simulations were confronted with the experimental investigations carried out by several spectroscopic methods such as Raman, IR, and UV-Vis absorption as well as photoluminescence. As model cluster systems, the physical properties of nanosized silicon carbide (SiC) particles in vacuum were numerically modeled. The computer simulations were also performed for SiC confined in polymeric matrix, namely, poly(methyl methacrylate), poly-N-vinylcarbazole, and polycarbonate. The obtained host-guest nanocomposites exhibit original optical and electro-optical features. 

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