Questions tagged [polymers]
Polymers is concerned with the physical properties of individual macromolecules. For questions regarding bulk behavior of ensembles of polymers, the [condensed-matter] tag may be more appropriate.
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What is the relationship between persistence length and timescale?
I have calculated the bending persistence length of a polymer using MD simulations in the nanosecond timescale. The persistence length is long (410 nm) compared to the contour length (40-45 nm). But ...
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Drying polymers (e.g. FDM 3D printing filaments)
As far as I understand, a polymer absorb some moisture and amount of (maximum) moisture that can be absorbed depends on its type (PLA ~1%, ABS? ~10%). Both simple commercial filament dryers and drying ...
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Partition function 1D polymer chain attached to a spring
Statement of the problem:
Consider a polymer chain consisting of $N$ linked monomer units with $N\gg 1$. Every monomer can be in state $\alpha$ or $\beta$ with energies $E_\alpha$ and $E_\beta$. In ...
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Polymer scattering isotropic assumption
I am reading the Polymer Scattering wikipedia page (https://en.wikipedia.org/wiki/Polymer_scattering). I don't understand how using an isotropic assumption they have gone from the first equation to ...
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What will be the effect of density on relaxation time?
I am doing a Monte Carlo simulation of protein chains of various lengths.
I change the densities of the simulation box.
In my experiment, I found that density has no effect on relaxation time.
Do you ...
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How can I assess the validity of a time-temperature superposition (TTS) master curve obtained from stress relaxation experiments?
I'm working on analyzing the viscoelastic behavior of a elastomer using time-temperature superposition (TTS) techniques based on stress relaxation experiments. I've come across various conditions for ...
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Flory-Huggins Chemical Potential of Mixing
Within FH theory, for a binary polymer blend the following is commonly found:
$$
\mu - \mu_0 = \left(\frac{\partial A_{mix}}{\partial n_A}\right)_{V, T, n_b} =\frac{\partial}{\partial n_a}\left(\chi \...
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Small-Angle X-Ray Scattering of Bulk Polymers
Does anyone have any recommendations on how to get useful information from SAXS of polymers when the system is not dilute?
This is the type of data we're working with:
My understanding is that since ...
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Soliton in non-degenerate polymer
I just started reading about the conduction mechanism in polymer. From what i read, polarons are used as method of charge transportation in non-degenerate polymer. While for degenerate polymer, both ...
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What is the diffusivity of colloidal Formazine in water?
I have synthesized Foramzine in an aqueous solution (turbidity = 4000 NTU), and will be further diluting it. I would like to know the diffusion coefficient (diffusivity/mass diffusivity) of colloidal ...
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Energy of pulling a polymer
When we have a polymer of $N$ monomers with position vectors $\vec{r}_1, \vec{r}_2, \ldots, \vec{r}_N$, pulled by a force $\vec{f}$, why is the potential energy then given by:
$U = \left( \vec{r}_N - \...
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Divergence of the Oseen tensor for the Zimm model?
While studying the Zimm model on the Doi & Edwards book "The Theory of Polymer Dynamics", I faced equation 4.41 which states that:
$$
\frac{\partial}{\partial\boldsymbol{R}_j}\cdot\...
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Material that is one-sided translucent [closed]
Is there a polymer material that is translucent from one side but not from the other side?
I want to build some custom push buttons that should appear completely black. Only when they are led by an ...
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Calculating the angle distribution of a worm like chain
I'm trying to calculate a probability distribution of orientation in 3D space for a worm like chain from one segment to another. In particular, I am trying to calculate the probability distribution of ...
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Why are tears in some plastics hard to start but easy to grow? [duplicate]
Take a generic bag of crisps, or a pack of ice cream: it takes some effort to tear open, you may want to use scissors, but then once you've opened it it's torn so effortlessly that you have to be ...
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