Digest of Literature on Dielectrics Volume XI (1947) / Chapter Skim
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IX Synthetic Plastic Insulation
IX Synthetic Plastic Insulation
Pages 79-90
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From page 79... ...
There was a time when the electrical industr~t constituted a major outlet for synthetic plastics and provided strong stimulus for the development ·of new plastics In fact' much of the drive for the development of polystyrene in this country came from the fact that this material was an outstanding dielectric substance which.should demand considerable use in the electrical industry. It is aifficult,to tell...~hat fraction of current polystyrene production finds its ultimate use in the,-electrica1 ~.ndustry9 but the fraction must be small.
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From page 80... ...
. A report from the IT, ,, Pureau of Minxish on ti~:oxici.~: and inflame Resistance of~rTher~iosetting Plastics' is obvic~usl~y of consid.erable i~Aportar~e to the entire insulation field.
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From page 81... ...
Some lmproveme~G,-'n toughness and a 30%.reduction in molding cycle are additional a.~vante~esO A copolymer of styrene and fumarodinitr~le is claimed to have higher heat resistance and better solvent resistance than polystyrene This patent is possibly the basis of Cerex, a high heat distortion s Serene base material Chick has been mentioned in previous issues of this Digest.
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From page 82... ...
Shale it,s electrical properties are ideals yet its remark&tile chemical resistance has perhaps Excited even more interest for use in gaskets. New Plastics Te~Q_ene is ~ crystalline polyester prepared from terephthalic aced And ethylene glycol (or their equiva]
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From page 83... ...
'Cr,~r,stallinit,T, solvent resistances high meltir~g points and dielectric properties can ar) ~arently,be.,,controlled in a region of' importance to the elec~tric'd;l;'industr~r.
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From page 84... ...
AL industrial acti~rit,7 in this field. Perhaps the first co~neric.~1 use of a polymeric plasticizer novas the ~nccr~cratior~ of ~nol~vrisobutylL!
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From page 85... ...
~5 what is prot;ably one of the basic po3 Anemic p3 asticizer patents clad me a linear polyester of 1,2-prcrylene glycol and sebaccic acid havlug a molecular weight between 1700 and 20,000 as a non-m~gratlug plasticizer for pol~-in:~] ckloride, polyvi.ryl acetate g or copolymers thereof a ~ A spectra' var:i~t~on on the po'ymoric plas+,nc~zers consists in using a ~Tin,yl chloricn~e -- 20 per cent vinyl acetate copo~yr`'er of molecular weight S,OOO 159G(")
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From page 86... ...
With the ever increasing demand for greater production and speed, the use of hi.giler end. higher frequencies is being pursued.
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From page 88... ...
fig :BIBLI()
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From page 89... ...
89 23. Shi ne g ~0 M., Modern Plast~ cs 9 25, 1309 Sept~mb~r (1947)
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From page 90... ...
~hittaker and Imperial Chemicals Industries, Ltd.
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