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jkmiller
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- Which chemical properties effect the physical property Young's Modulus? I know the answer is not as simple as intermolecular force
I can't seem to figure out which chemical properties govern the physical property that is young's modulus. For example, any linear (or with a low degree of branching) polyethylene with no crosslinking is still a somewhat rigid and solid substance (higher ym), whereas the most linear possible silicone with lots of crosslinking (VMQ) is super rubbery in the same temperature range (really really low ym) .
At their core, silicone and hydrocarbon plastics are chemically different on so many levels, but which differences are the ones that determine the modulus? I would assume it would be intermolecular force (so LDFs for both unless silicone can create temporary dipoles in that case I would predict them to be less fluid), which would make sense that silicones were more fluid because they are less linear, but there are plastics a whole lot less linear than VMQ that are way more rigid.
Help me physics friends I am but a lowly biochemist very lost in the realm of materials physics.
At their core, silicone and hydrocarbon plastics are chemically different on so many levels, but which differences are the ones that determine the modulus? I would assume it would be intermolecular force (so LDFs for both unless silicone can create temporary dipoles in that case I would predict them to be less fluid), which would make sense that silicones were more fluid because they are less linear, but there are plastics a whole lot less linear than VMQ that are way more rigid.
Help me physics friends I am but a lowly biochemist very lost in the realm of materials physics.
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