aommaster Posted December 26, 2003 Posted December 26, 2003 The displayed formula if polystyrene looks very similar to a poly ethene molecule. The only difference is that it has a ring of 6 carbons. Here is the quiestion: Are the carbons connected by double bonds? If not, then where is the 4th bond, as each carbon will only have 3 bonds connected to it
YT2095 Posted December 26, 2003 Posted December 26, 2003 Aom: your giving us your homework to do aren`t you!?
aommaster Posted December 27, 2003 Author Posted December 27, 2003 no, i was actually revising and thought of these questions! Honestly, i know it was a long chain of questions. Don't worry, trust me, cause i have another chain waiting!!! lol
apathy Posted May 30, 2004 Posted May 30, 2004 the carbons in the polymer chain in polystyrene are single bonds the carbons in the phenyl ring are aromatic and have a net 1.5 bond each
aommaster Posted May 30, 2004 Author Posted May 30, 2004 hmmmm.... is that the same meaning as it having a benzene ring? That is what my teacher told me when I asked him about it! By the way, what is the chemical name for polystyrene? and, what is meant by a net 1.5 bond?
Skye Posted May 30, 2004 Posted May 30, 2004 Empirical chemical formula of (C8H8)n. You could call it something like (CH3CHPh)n too I spose, or draw the structural formula. I hate nomenclature. The 1.5 bonds thing just refers to the way we normally represent carbon-carbon bonds; single, double, triple. In a benzene ring you can represent the carbons being bonded to each other by alternating double and single bonds. This isn't really accurate though. It's more like the electrons 'delocalise' and are free to move in a limited way, so that the double and single bonds are averaged out over the whole ring structure, giving a net of 1.5 bonds per carbon. This phenomenom is called resonance.
aommaster Posted May 30, 2004 Author Posted May 30, 2004 Thanks alot Skye. Any idea on what the chemical name of styrene would be?
apathy Posted June 15, 2004 Posted June 15, 2004 a "phenyl" group is a benzene ring bonded to something, but really a phenyl group is C6H5 and benzene is C6H6 the chemical name for polystyrene is polystyrene If you want a more IUPAC-y name, maybe poly(ethenylbenzene) or poly(vinyl benzene), but everyone knows it as good ole polystyrene
aommaster Posted June 16, 2004 Author Posted June 16, 2004 poly(ethenylbenzene) ahh... that was the one I was looking for. The 'technical' name for it!
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