Polymer Definition and 109 Threads

Can CuCl and Me6TREN form radicals? Reaction is at room temp and in water (not buffered)

Hello everyone, I am trying to find how to calculate the theoretical yield of polysuccinimide I synthesized from the aspartic acid. I added 10g of Asp and i took 7,3g of PSI. Someone who knows how to find the yield?

Hello All : as i try to create better economical situation for my self , as some of you noticed that i tried to enhance few things in engines , although it did not quaitly work out it lead to another invention , i couldnt change it yet to economical benefit , due to tests required , and dont...

So i just have my XRD result (Polymer Specimen) which i use to determine crystallinity of my material, and it turns out that my material has no obvious peak, and have a broad peak which usually associated with amorphous material. I added some filler to my material and it became more and more...

I am absolutely new to Polymer simulation. I am trying to understand the simulation by analyzing source code written by others. Can anyone tell me what are the differences between the following three source code in terms of their objectives? Monte-Carlo-simulation-of-polymers...

All polymer linear bearings i have seen have a lot of groves in the running direction (at least the ones for round shafts). Is this just to minimize the surface area in contact with the shaft to minimize the friction? Or do they have another function like clearing dust and particles? And why...

Out of sheer curiosity, would a polymer of the following structure be theoretically possible? Imagine that the "N-methyl" groups are just the bounds of what is shown, and not actual carbon-containing substituents... It doesn't seem to break any elementary bonding rules. However, the C-C bond...

I am aware that there is a difference between a polymer and a macromolecule (due to types of bonds, structure, etc.) but all of these seem to be chains like polymers to me. I know that is incorrect because there is no option for all of the above.

My lecturer said that as a first approximation, we can take the polymer chain to consist of ##n## freely jointed rods of length ##l##. That's just going to give$$\langle \vec{R}_n^2 \rangle = \langle \sum_{i=1}^n \vec{r}_i \cdot \sum_{j=1}^n \vec{r}_j \rangle = \langle \sum_{i=1}^n \sum_{j=1}^n...

I am wondering if two polymer particles, of same kind, heated above Tg can be mixed, over time, if they are squeezed together. By mixing I mean that the surfaces of the two particles will mix into one after they are squeezed together. For simplicity let's assume that the polymer particles are...

Hi All, I'm doing research in magnetic nanoparticles that are coated with chain molecules (oleic acid, I believe) and I am trying to model these molecules' effective spring constant. The basic scenario is this: When a water-based ferrofluid is evaporated, it leaves behind only dried...

We are incorporating a PDLC layer into a product being developed by us and it requires almost constant activation to remain transparent. The PDLC draws 0.557 Watts of power per hour at 60VAC. The goal is to get a battery/power source (of any type even proprietary) to last the upwards of 26,000...

Homework Statement Consider a polymer formed by connecting N disc-shaped molecules into a onedimensional chain. Each molecule can align either its long axis (of length ##l_1## and energy ##E_1##) or short axis (of length ##l_2## and energy ##E_2##). Suppose that the chain is subject to tension...

What does it mean colloidal suspensions, polymer solutions? in flow of fluid.

Homework Statement A polymer chain consist of a large number N>>1 segments of length d each. The temperature of the system is T. The segments can freely rotate relative to each other. A force f is applied at the ends of the chain. Find the mean distance ##\textbf{r}## between the ends...

I am working on polymer nanocmposite. I want suggestion regarding the application of it. Which is the most emerging application field of PNC ?

Working on a research project to develop a test standard for abrasion testing pressure washer hoses. Ideally this could be used on any sort of hose. We have a set procedure that has worked on a couple hoses that looks like this: .Weight applied is constant .Cycle speed is constant .Constant...

Hello, I ran a test on an industrial composite of 30% glass-filled nylon 6, and my melting temperature peak is too low. The range was from -30 C to 275 C. Why could this be happening? Should I suspect the sample pan? Thanks.

Good day all! I've got a granular mixture of PLA, ABS, HIPS, and PETG with a particle size of about a quarter inch, and I'm trying to isolate each polymer from the mix. PLA and PETG have densities of about 1.27g/ml, and ABS and HIPS have densities of around 1.06g/ml. I think a weighted solution...

Greg Bernhardt submitted a new PF Insights post New Research on Untying Knots in Polymers Continue reading the Original PF Insights Post.

Homework Statement Consider a “true macromolecule” - a chunk of polybutadiene network of mass 100g. How many monomers all covalently bonded together does it contain if the molar mass of the monomer is Mmon= 54g/mol? What is the molar mass of this macromolecule? Homework Equations Molar mass...

Homework Statement Homework Equations I want to check if I think it right! The Attempt at a Solution If N=1: ← or → (2 configurations/ each length is l) N=2: ← or → or ←← or ←→ or →← or →→ ------→----← (6 configurations/ folded polymer's length is l/2 andunfolded polymer's...

I was not sure if this was the best place for this, it could fit here, in the Chemisty section or the Programming section. So feel free to move if needed. Essentially I have been modeling polymers in python and using a Monte Carlo, Metropolis type algorithm, to minimise its energy into...

Hey guys, I am trying to located more information on a polymer that was called celanese fortiflex. It was used in TRIGA nuclear reactors to hold samples in a high neutron flux and was developed (I believe) around the early 1960's. Some modern PE materials have been tested, but fall apart after...

I'm wanted to do an experiment with interfacial polymerization; producing nylon 6,10 with sebacoyl chloride and hexanediamine. I was wondering what aspects of this reaction I could research, or what variables I can change?

Hi there, in electrospinning, a positive charge of around 10.000Volt is applied to a needle, where a viscous polymer is extruded. There is a grounded collector in a distance of 15mm and the established electrical field generates electrostatic forces and draws a thin polymer jet to the...

I was wondering if there were any possible experiments that I can conduct in a high school lab setting.

klotza submitted a new PF Insights post Polymer Physics and Genetic Sequencing Continue reading the Original PF Insights Post.

Hi respected peers, Firstly, i must apologise in advance for any error i may make within this forum, I'm a new member here. The question i wish to ask is with regards to observing a glass transition and crystallisation peak upon cooling, however without observing the obvious melt of a polymer...

A one-dimensional polymer molecule (rubber) is chain of N links of the same length a, the links can go either forward or backward but always stay parallel to the x axis. If one denotes the coordinates of the joints are ${x_0, x_1, . . . , x_N}$ , then $|x_n − x_{n+1}| = a$. The energy of the...

Homework Statement Topic : Idendification of different types of polymer Suggested materials : Plastic bottles or materials Sugeested methods of analysis : Volumetric analysis, Chromatography ,pH, Solvent extration, Distillation General purpose of project : To inculcate awareness on health and...

Peierls distortion states that for a 1 dimensional polymer (like polyacyteline) with lattice spacing a they should have a half-filled conduction band, why? And how does changing the lattice space to 2a cause it to form an energy gap? In my mind it should be the same as the first case...

Homework Statement 2. The attempt at a solution I chose no. 1 only, but the answer is 2&3, I can't seem to see how 10^-6 came about. And for C, I'm not clear how it came about too.. Is it because 1 mole consists of 6x10^23 atoms, so no. of moles of the polymer is 1/(6x10^23) ? And why is 1...

Dear PF Forum, I have questions about carbon based life and molecule back bone. Is it true that all life on Earth are carbon based? If it is true, why? Is it because carbon is halfway in periodic table? 4 valence? What about Silicon, Tin and Germanium? They have 4 valence, why life is not based...

I have a tutorial question that I'm not too sure of. The question states: Calculate the volume fraction Φ for a polymer solution of concentration C (given in g/L) and hydrodynamic radius R? The answer was given as...

Homework Statement if we have only a measuring cylinder (500mm high and 50mm diameter), a stop-watch, a ruler and a 100μL syringe. We assume that the density of the suspension is 1g/cm3, and that the polymers are spherical How can we determine the viscosity and the volume fraction of the...

Ok, I am really close to this. d-Limonene dissolves Polystyrene (I have tested this) and Liquid Isobutane mixes with d-Limonene (I have also tested this) However, when I mix all three together, the Polystyrene becomes completely separated from the solution. Same thing with all polymer solutions...

Hello, I am working on a science fair project with my son. His project is about the mobility of polymer chains depending on temperature and pressure. As part of his project we want to flash freeze a piece of plastic to show how brittle it becomes. We bought instamorph, which is polycaprolactone...

Homework Statement (Note: This isn't an assignment problem, more a curiosity about the derivation of an equation - hopefully it is still posted in the right forum..) I have working through the derivation for the partial molar Gibbs free energy of mixing from the Flory-Huggins expression for...

The question tells me that some experiments have shown that the force needed to stretch a polymer molecule by an amount (Δl) is given approximately by: F= (kBT/P)*((1/4)*(Lo2/(L-Δl)2-(1/4)+(Δl/L)) Yea, I know, nasty looking. Anywho: F = Force T = Temp. kB = Boltzmann's Constant P =...

Hello Forum, I have two polymers (both in pellet form). Their spec sheet shows that the two polymers have different intrinsic viscosity IV. There are so many definitions of viscosity (dynamic, intrinsic, inherent, etc.) In general viscosity and density are two independent properties of a...

Homework Statement A rubber band at temperature ##T## is fastened at one end to a peg and supports from its other end a weight ##W##. Assume as a simple microscopic model of the rubber band that it consists of a linked polymer chain of ##N## segments joined end to end; each segment has length...

Hello all, I am a grad student in materials science. As part of a research project, I need to measure/detect the velocity of a water saturation front moving through polymers (a few materials, most fluoro/perfluoropolymers). The ultimate goal of the project is to determine the permeability of...

Hi everyone, In this paper ( http://pubs.acs.org/doi/abs/10.1021/la962131c ), the authors calculate the surface energy of polymer and the contact angle of various liquids on these polymers using a so-called "liquid - polymer equilbrium contact dsitance". I'm wondering how to calculate such a...

Hi, I have a question regarding polymers. You know that polymers, basically, consist of chains of polymers, each chain including number of repeating units (monomer). These chains can be in amorphous or crystalline states. Experimentally, is it possible to fabricate and see a single chain...

Homework Statement Why is there such a large difference between the elastic moduli of metals and polymers? Homework Equations The Attempt at a Solution I am thinking because of the different bonding between metals and polymers. Since metals have metallic bonding and polymers...

Homework Statement A polymer consits of ##10^{20}## monomers, each 2 nm long. One end of the polymer is hanged at the ceiling on the other end, we have a load of ##4\cdot 10^{-10}g##. Calculate the average potential energy!Homework Equations The Attempt at a Solution Well... I don't know...

I have been thinking to extract gases from SAP (the gel is super absorbent polymer(sodium polyacrylate)). The gases are trapped inside the gel in form of bubbles gas. I am thinking of using salt to turn it back to liquid or using vacuum pump to extract gas out. Using salt might be the best way...

Homework Statement A polymer of ##10^{20}## molecules each 2nm long is hanged from the ceiling. The other end of the polymer is attached to a ##m=4\cdot 10^{-10} g## load. Calculate the average potential energy! Temperature is 300 K. Homework Equations ##<E>=<E_p>=\frac{\mathrm{d} (\beta...

Homework Statement Given for polystyrene K = 1.6x10^5 and a = 0.71 and for PVC K = 1.5x10^5 and a = 0.77 a universal calibration curve has been created from PS and the molar mass of PVC at a certain elution volume has been calculated. The part I'm not sure on is the question: Show which of...