Pentonal

Heating PipinglAir Conditioning, (monthly) Penton PubHcations, Inc., Cleveland, Ohio. 

Technical data, Robar Industries, Conshohocken, Pa. Penton Publishing Co., Hasbrouck Heights, N.J., Horizon House, Dedham, Mass. 

Poly- propylene poly- ethylene CAB" ABSf PVC Saran Polyester glass 1 Epoxy glass phenolic asbestos Fluoro- carbons Chlorinated polyether (Penton) Poly- carbonate... 

In the early 1950s novel polyethers were prepared in the laboratories of the Hercules Powder Company and of Imperial Chemical Industries Limited from oxacyclobutane derivatives. One such polyether that from 3,3-dichloromethyl-1-oxacyclobutane, was marketed by the first named company in 1959 under the trade name of Penton. Commercial manufacture of this material had, however, ceased by the end of 1972. 

In 1975 the Hercules company announced the preparation of a polymer very similar in structure to the discontinued Penton. The new polymer is poly-(1,2-dichloromethyl)ethylene oxide ... 

It may be prepared in two stereo-regular forms, cis- and trans-. The cii-polymer, which crystallises in zig-zag form, has a of 235°C, whilst the fran -polymer, which crystallises in helical form, melts at the much lower temperature of 145°C. Tensile strengths of both forms are reportedly similar to that of Penton whilst the tensile modulus of 2300 MPa is about twice as high. Unfortunately the material is rather brittle with an impact strength only about half that of polystyrene although this may be improved by orientation. 

J. H. Ridd, Acc. Chem. Res. 4 248 (1971) J. H. Ridd, in Studies on Chemical Structure and Reactivity, J. H. Ridd, ed., John Wiley Sons, New Vbik, 1966, Chapter 7 J. G. Hoggett, R. B. Moodie, J. R. Penton, and K. Schofield, Nitration and Aromatic Reactivity, Cambridge University Press, Cambridge, 1971 K. Schofield, Aromatic Nitration, Cambridge University Press, Cambridge, 1980 G. A. Olah, R. Malhotra, and S. C. Narang, Nitration, Methods and Mechanisms, VCH Publishers, New i)rk, 1989. 

B. Moodie, J. R. Penton, and K. Schofield, Nitration and Aromatic Reactivity, Cambridge University Press, Cambridge, 1971. 

Ethanol n-Pentone Propane n- Pentane Propane 67 mol % n-Pentone 33 mol % Propane 33mol% n-Pentone 67 mol % Propane Benzene n-Heptone... 

Figure 12-138A, B, C, D. Centrifugal fan system control methods. Note the effect of air distribution zone control (A for VAV) terminal on sudden jump in system resistance to fan operating static pressure curve. (Used by permission Haines, R. W. Heating/Piping/Air Conditioning, p. 107, Aug. 1983. Penton Media, Inc. All rights reserved.)...

Source Adapted by Integrated Systems, Inc. from Gears and Gear Drives, 1996 Power. Transmission Design, Penton Publishing Inc., Ohio, pp. A199-A211. 

Other polyethers The chlorine-containing polyether Penton has excellent resistance to mineral acids, strong alkalis and most common solvents. It is not recommended for use with oxidising acids such as fuming nitric acid. 

Processes), (ASM), Special Issue Penton Publishing (1994). Basic reference work-up dated annually. Tables of data for a broad range of metals, ceramics, polymers and composites. 

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