Polymers Definition and 54 Threads

Let's say you have n glucose monomers. (C6H12O6) n You want to find out how many possible polymers exist in combining those n number of glucose molecules randomly. So glucose_1 has 6 OHs that can combine with glucose_2 which also has 6 OHs. Starting with glucose_1's first carbon C1, at that...

"In the case of negligible paracrystallinity, the density of states (DOS) of the 1D pi-stack depends on the amount of on-site disorder generating a Gaussian tail of states extending into the bandgap (Fig. 3a). Typical pi-stacks of conjugated polymers exhibit moderate amounts of paracrystalline...

Hello everyone, First of all a very happy new year to everyone! And a big thank you to all the people who contribute to this forum, I have learned so much from here. I am prototyping a design for a part that will be used in a consumer product. I am in the early stages of researching...

What's the best polymerisation method to manufacture a polymer drug host with high molecular weight? Is there a quick method to do so?

Hello everyone! I am currently working in the field of polymer composite materials.I was wondering what are all the possible ways to join two different polymers together? For example, Ultra-high-molecular-weight polyethylene (UHMWPE) and Polycaprolactone. I know that welding is process that...

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

There are some plastics I am using that when melted, pull apart in a stringy way. My best comparison is like melted cheese in a sandwich. I want to know more about this, but other than looking up 'polymer rheology', I'm not sure what I should call this type of flow. I want to know what causes...

I was wondering whether it is possible for amino acids that end up in a cell (ready to be made into proteins) to spontaneously start to bond in the cytoplasm (or wherever the routing channel is I guess) and create randomly floating short strands of polymers? Furthermore, can it ever happen that...

Hello internet! I understand the basic principle of EAPs (you apply a potential difference and it moves) but I can't for the life of me find any specific, named EAPs that fit my requirements. If possible could you tell me if you know of an EAP that: Works in a normal environment (air, room...

Could a polymer that acts like a photoresist (either positive or negative) also be a thermoplastic. Do you have any ideas on what polymer/mechanisms could be used to achieve this?

Hello all, Is there any direct relation ship exists between the thermal expansion and density of polymer material (eg. PMMA, Teflon) ? Like, Lorentz- lorentz law relates directly the refractive index and density of the polymer. similarly any laws relating (thermal expansion and density of...

Hello! I'm looking for a substance that can: (1) be turned into a flexible material (e.g., a flexible plastic), (2) is dissolveable in rubbing alcohol but not water (or blood), and (3) safe for a medical procedure ... And, if possible, preferably biodegradable... I know that's kind of a...

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...

I'm want to design a device that uses Electroactive polymer. Do you know design companies that have experience with Electroactive polymers? Do you know manufacturers of Electroactive polymers?

Hi, I'm thinking the following scenario. I have some solution in a container, where polymers are dissolved inside. If left so, the polymer will be homogeneous in the liquids. Now I add an electric field on the two sides of the container, will the polymers be polarized and stretched? So the...

So I am doing a physics science fair project. My original idea was "How does heat affect friction in shoe polymers?" but how would I know how to identify shoe polymers and where would I get 5 or 6 different pairs of shoe polymers. I changed it to "How does different temperatures affect friction...

Would anyone here have an opinion on whether either of these MSc courses is better to have when looking for employment later? I'll already have a BSc Physics. 1) MSc Materials Science (at a much better ranked university than below, and includes some programming) 2) MSc Advanced Composites &...

I want to do research in polymers, and would like to build somewhat of a knowledge base before committing to a specific area. I'd like to spend 2 hrs/day just reading stuff and learning more about the field, and apply for Fall '15. I have some research experience from my undergrad, knows a good...

Hello all, I know Barium Titanate is a common ceramic dielectric material. However, the methods of production seems to result in a powdered form of this substance, and most of the commercially available forms seem to be limited to powders of varying sizes from nanometers to micrometers; how...

Hi, I was wondering if anyone knows if there is any differences between the polymers Silicone 184 and Siloprene K1000? I am to use this for layer application and gas diffusion. Kind regards,

Why is there such a large difference between the elastic moduli of metals and polymers? Is it because of different bonding? Or something do with the structure? Thank you!

Hi all, It is well known that poly(3-hexyl thiophene) and other conductive polymers with alkyl substituents align when deposited on a surface (e.g. by spin coating or drop casting). The common orientations for P3HT on silicon/silicon dioxide are "edge-on" in which the alkyl side-chains point...

i am interested in discussing about the pros and cons of having a vesicle of ph sensitive polymer (with drug to be delivered inside it), inside a vesicle of thermosensitive polymer for drug delivery. This gives us dual control capabilities that is temperature and ph based trigger...

Hi, I was browsing the Internet and I found a thread about polymers pyrolysis: http://www.energeticforum.com/renewable-energy/7040-how-turn-plastic-waste-into-diesel-fuel-cheaply.html Guy there states, that just due to temperature of about 400C polymer chains are being broken into...

This is not a specific question. it's just common sense. all temp values in celsius. The impact values of polymers are definitely astonishing when i think at the molecular level it is said that increasing the molecular weight of the chains increase the impact strength. consider same...

Watsup! I'm taking this nano class which is awesome but I am getting stuck on the gen chem material! no bueno. just want to make sure i did this right. Thanks! Homework Statement [/B] "A blend contains 45wt% polystyrene and 55wt% polypropylene. What is the mole fraction of polystyrene in the...

Hi, these is possibly a dumb question but... I know that with regards to gases: (P1*V1)/T1 = (P2*V2)/T2 However does this still apply to polymers in liquid state? In an injection moulding machine if I increase the pressure will you get an increase in temperature if the volume of...

Chemical engineering topics like heat transfer, transport, separations etc. never really appealed to me. But I really like research, and I think R&D is the place for me in industry. In order to work in R&D, I need an advanced degree. But I'm currently trying to decide what's the best way to get...

Hello, everyone. So, this is my first time doing Chemistry at school and today my teacher assigned each student a topic in Chemistry to research and give a short presentation on it on Monday. He assigned me the topic of, Substitution Polymers. So, tonight I thought I might do some research on...

So my question is this: Would Pyroelectric Effects become more pronounced if a polymer sheet was, instead of 1 cm thick, but rather, the thickness of a single polymer chain. For example, say the 1 cm thick pyroelectric polymer was heated. Since it is many chains thick, it would look something...

Hi! I have a question related to conductivity of conjugated polymers. I found that they could become conductive if they're dopped with any other element. Is it 1D conductivity because I read that electrons are not so mobile between the chains of polymers in a bulk, but they are along a polymer...

Hi! I need a reference (book, webpage) that explains how the structure of a polymer affects its properties. I've found plenty of material over how structure changes its mechanical properties, but I could not find how it changes other parameters (e.g. electrical conductivity, boiling point...)

I'm trying to get an understanding of what properties these two forms give a compound. I read that crystalline polymers are very strong but also very brittle whereas amorphous polymers are very tough meaning they can be bent and twisted but won't break. I then read that an example of a highly...

In college we measured the viscosity of microcrystalline cellulose and used the result to determine its degree of polymerisation. Is the viscosity of a polymer directly proportional to its degree of polymerisation or something? In other words the bigger the polymer, the more viscous it is? Does...

Homework Statement Hello everyone, I have a couple of question regarding polymers that I some trouble understanding and hoping you guys would point me into the right direction. For ''Thermosetting'' polymers I know that they become permanently hard with covalent bonds which they chain...

Does anyone know of any polymers that are compatible/approved for use inside the body that don't degrade? I can find lots of information of biodegradable polymers, but my project involves ones that don't degrade, or if they do - very little. Thanks!

Hi everyone, This is my first time posting here, so I apologize in advanced for not knowing the culture of this site. Please be patient, I will learn. :) I'm studying the sorption behaviors of gases in polymers and I have a question about sorption in rubbery polymers following Henry's...

I am a high school chemistry AP student. In class, my teacher told us about how benzene's delocalized ∏ electrons can donate to a metal but it is not a strong bond. I wanted to know if it was possible to make a coordination compound that was also a polymer by using a biarene ligand, one end...

Hi all, Firstly, I'm not sure where to post this thread, but I'm hoping here is the right place. My questions developed through reading Verlinde's paper on entropic gravity: http://arxiv.org/abs/1001.0785" However my questions are with the introductory thermodynamic ideas he presents...

Hello everyone, I've had a hard time finding places where to look up the different mechanical properties of polymers. I am mainly interested in density, young's, bulk, and shear moduli. I would appreciate if anybody can point me out to some good resources. Thank you

Glucose (C6H12O6) is a monomer that can form naturally occurring polymers. What would be the approximate molecular weight of a polymer made from 5 glucose monomers? a) 810 b) 828 c) 882 d) 900 i said D, but my friend in convincing me its B :S

1. HIPS is a : a)Polystyrene-Polybutadiene blend b)High Impact Polybutadiene Blend c)Polystyrene-Polybutadiene copolymer blended with polystyrene and polybutadiene d)High polystyrene matrix material I'm pretty sure it's not B, and I'm leaning towards C, but I'm not very confident...

My book is talking about Condensation & Hydrolysis reactions & has said that Polymers are "digested" to become monomers in hydrolysis reactions, i.e. when water is added to a polymer. I just want to clarify, 1) Does adding water to all polymers break them apart instantly? i.e. are all...

I am looking for a polymer that can be manipulated and that expands after applying pressure between the fingers, as a result of piezoelectric effect.

hi i am doing photoconductivity but i did not understand how to set the lock in amplifier for the photoconductivity through lab view.please help me out in doing pc

This is my first post. I have a paper due on microshear banding in polymers. I have found lots of papers on the subject, but nowhere have I found a straightforward explanation of what is the underlying cause of these bands. What changes in structure are causing the bands, and what effects do...

Hey guys, just trying to get my head around this one.. Why do UV rays effect polymer chains so much? I understand that they weaken the bonds within the chains to create free radicals which then go on to react with other things which eventually makes the whole chain degrade as a whole, but...

iam searching good books for ceramics please suggest some books actually i need details about the production techniques ,structural features,mechanical properties,industrial ceramics like tungestencarbide,silica-alumina,zirconia,sialons

I have an application where I need to bond various materials together, perform certain machining, cutting, forming operations on this matrix - then - with the matrix in position, gradually heat & then drive off the polymer until only the metallic component remains in place. I had in mind a...

[SOLVED] Cross-linking polymers Homework Statement What changes in consistency (if any) do you expect when adding more borax solution to your slime? Why? Homework Equations None The Attempt at a Solution Slime is a cross-linked polymer. Borax (borate ion) is the cross-link. So...