All Questions
6
questions
2
votes
0
answers
60
views
Is a worm-like-chain purely entropic?
I consider a worm-like chain with the Hamiltonian given by:
\begin{equation}
H(L)=\frac{\kappa}{2}\int_{0}^{L}ds\left(\frac{\partial\vec{t}}{\partial s}\right)^2
\end{equation}
where $\kappa$ is the ...
- 155
0
votes
1
answer
2k
views
Why do rubber bands at higher temperatures stretch more?
I did an experiment where i placed a rubber band in water at different temperatures (-15°C till 90 °C) , and then a put a constant mass on the rubber band, to see how far it would stretch.
What i ...
- 11
1
vote
2
answers
1k
views
Elasticity of rubber bands at varying temperatures
So what i read online was that when rubber bands can stretch (become more elastic) more when their at colder temperatures. How i understood is that entropy allows for the molecules to align up more ...
- 11
3
votes
2
answers
2k
views
Entropic force in polymers
According to my textbook, the elastic force in a rubber is caused to the tendency of the polymers to return to their initial disordered state of higher entropy.
But isn't this looking at entropy on ...
- 2,780
15
votes
2
answers
789
views
The entropic cost of tying knots in polymers
Imagine I take a polymer like polyethylene, of length $L$ with some number of Kuhn lengths $N$, and I tie into into a trefoil knot. What is the difference in entropy between this knotted polymer and ...
- 945
5
votes
1
answer
384
views
Entropy of a polymer contained in a sphere with infinitely thin chords
Imagine that I have a polymer (approximated as a freely diffusing, freely jointed chain with some number of subunits 'N'), and I place this polymer into a sphere of some volume 'V'. Next, I proceed to ...
MorningCoffee1998