Cast poly

There are a number of polymers which in fact cannot be melt processed because of their high molecular weights. These include PTFE, very high molecular weight polyethylene and most grades of cast poly(methyl methacrylate). In such cases shaping in the rubbery phase is usually the best alternative. 

The solubility of commercial poly(methyl methacrylate) is consistent with that expected of an amorphous thermoplastic with a solubility parameter of about 18.8 MPa. Solvents include ethyl acetate (8 = 18.6), ethylene dichloride (8 = 20.0), trichloroethylene (8 = 19), chloroform (8 = 19) and toluene (8 = 20), all in units ofMPa. Difficulties may, however, occur in dissolving cast poly(methyl methacrylate) sheet because of its high molecular weight. 

Wang, I Lin, Y. Qian, W. Jackson, T. 1998. Thin-film transistors with high carrier mobility based on solution-cast poly(3-alkyl thiophene). 1998 Mater. Res. Soc. Fall Meeting Symposium R. pp. 372. 

Tang ZG, Black RA, Curran JM, et al. Surface properties and biocompatibility of solvent-cast poly[ -caprolactone] films. Biomaterials 2004 25(19) 4741 748. 

Fig. 6. Normalized fluorescence spectra of cast poly(N-vinylcarbazole) film doped with 6.2x10 mole perylene per mole carbazole unit. (A) total internal reflection condition with =73.6°. (B) normal excitation condition. Both spectra are...

KOR Koros, W.J., Smith, G.N., and Staimett, V., High-pressure sorption of carbon dioxide in solvent-cast poly(methyl methacrylate) and poly(ethyl methacrylate) films, J. Appl. Polym. Sci., 26, 159, 1981. 

Dinitrotoluene Hexamethylene diisocyanate Methylene bis (4-cyclohexylisocyanate) Toluene-2,4-diisocyanate Toluene-2,6-diisocyanate elastomer mfg., abrasive wheels Toluene diisocyanate elastomer mfg., adhesives Toluene diisocyanate elastomer mfg., cast Poly (diethylene adipate) polyester elastomer mfg., film Toluene diisocyanate elastomer mfg., high strength Bitoluene diisocyanate elastomer mfg., linings Toluene diisocyanate elastomer mfg., mechanical items Toluene diisocyanate... 

In this work, MDI-terminated polyester prepolymer based on ethylene adipate polyol (Baytec MS-242) was used to prepare cast poly(ester urethane) materials. The HER-TG materials, HER-HP and HQEE were used as chain extenders. As discussed in section 8.4, technical grade HER materials contain various levels of high MW diols as reactive impurities. Therefore, as with poly(ether urethanes), the high MW diols are expected to play a major role in the performance of poly(ester urethanes) made with these materials. 

When cast poly (vinyl chloride) films are irradiated by ultraviolet light at various intensities and temperatures under a nitrogen atmosphere, dehydrochlorination reaction takes place [554]. This reaction occurs in two parts. During the first hour, the reaction is dependent on the intensity of light and the temperature, but after that it becomes independent of these two parameters. 

Solvent Cast Poly(methyl methacrylate) and Poly(ethyl methaciylate) Films, J. AppL Polym. Sci., 26, 159 (1981). 

Chen, C.-h., et al., 201 lb. Mechanical characterizations of cast poly(3,4-ethylenedioxythiophaie) poly(styrenesulfonate)/polyvinyl alcohol thin films. Synthetic Metals 161, 2259—2267. 

Poly(alkylthiophene) solutions show remarkable thermochromic and solvato-chromic properties. Thus, besides the main absorption band at 430 nm, the low-temperature optical spectra of poly(alkylthiophene) solutions present a line structure involving additional bands at 560 and 607 nm [198]. Thermochromism has also been observed for solution-cast poly (alky lthiophene)s films [199]. Moreover, it has been reported that poly(alkylthiophene)s are fusible and piezochromic [184,200] and that their photoluminescence increases with the length of the alkyl chain and temperature, reaching a maximum around the melting point [201]. 

Poly(vinyl chloride), cast Poly(vinyl chloride), extruded Poly(carbonates)... 

The Second World War accelerated interest in thermoforming, with the demand for cast poly(methyl methacrylate) fighter/bomber windows, grm closure and windscreens (5). 

Initial researches into acrylic polymers were concerned rather more with polyacrylates than polymethacrylates. The first acrylic polymer to be produced commercially was poly(methyl acrylate) production was begun in 1927 by Rohm and Haas AG in Germany. In about 1930, Hill of Imperial Chemical Industries Ltd. (U.K.) prepared cast poly(methyl methacrylate) and found it to be a potentially useful material but high raw material costs prohibited commercial development. (At this time, methyl methacrylate was obtained by dehydration of the hydroxyisobutyric ester.) In 1932 Crawford (also of Imperial... 

In a UPS study by Fujimoto et al,[8I], the effects of air and temperature on the electronic structure of chemically and electrochemically prepared solution-cast poly(3-alkylthiophene) films were investigated. It was found that the threshold energy was almost identical for the different solution-cast films. However, electrochemically, as-prepared films had a smaller threshold value by about 0.3 eV. Changes in the work functions (of about 0.2 eV) of the samples were observed upon heating in vacuum. Subsequent recovery upon exposure to air was attributed to dedoping and doping effects caused by oxygen. 

Jaczewska J, Bndkowski A, Bernasik A, Moons E, Rysz J. Polymer vs solvent diagram of film structures formed in spin-cast poly(3-alkylthiophene) blends. Macromolecules 2008 41 4802-10. 

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