Thursday, March 31, 2011

Discussion of capacitor dielectrics

This seems quite good.

Polyethylene looks good, approximately in the same vicinity as polypropylene.  This is an issue because quite often interconnects are made with polyethylene (including the Belden 1800F I just ordered).  Not because I'm trying to compare polyethylene to polypropylene capacitors (I've never seen polyethylene capacitors).

Chemically, polyethylene is the straight stuff, simple carbon chains.  Polystyrene has phenyl substitutions.  Polypropylene has methyl substitutions (similar to phenyl).  Teflon has perfluoro substitutions (minimum polarizability, even less than the straight chain).  PVC (mylar, vinyl) has chloro substitutions.

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