Talk:Elastic
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[edit] Theory behind elasticity
Does anyone know exactly why rubber and the like stretch? what are the mechanics involved? i have previously heard two theories, and i was wondering which of them (if either) is true:
- elasticity is caused by the bonds along the carbon backbone of a polymer bending back and form, with the bonds always reforming the prefered angle of 109°
- carbon to carbon bonds stretching laterally, with the electrostatic attraction reasserting the original dimensions
i realise that they are both very similar, and in reality the reasoning is probably somewhere inbetween. could an expert please explain, and type it into the article? cheers, mastodon 20:56, 4 November 2005 (UTC)
In my understanding, what happens in rubber is that the polymer chains which are disoriented in the unstretched state, align when a stress is applied.Hence the length increases considerably, up to a point.
The reason the material returns to the previous state (or near enough) is that the polymer chains are crosslinked between each other by Sulphur bridges - the material has been "vulcanised". Therefore, once the stress is removed, the crosslinks force the polymer chains back to their original disoriented
ACH 20:48, 6 December 2005 (UTC)
[edit] this is part
This is part of what i am looking for but just not all. Thank You anyways.屌你呀..唉..成班仆街係到屈我-.-
