What is a "head to tail" polymer?
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A polymer is a chain of the same repeating molecule(s).  Suppose the molecule is represented as A - B - C.  Let A = the head and C = the tail.\n\nA 'head to tail' polymer  would look like:\n\nA - B - C - A - B - C - A - B - C \n\nA 'head to head polymer would look like: \n\nC - B - A - A - B - C\n\nAnd a 'tail to tail' would look like: \n\nA - B - C - C - B - A\n\nNow apply these concepts to the actual structure of Acrylonitrile.\n\nBest wishes.
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I think you are looking for this: \n\nhttp://www.cms-chemicals.com/
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Polymer is a term used to describe a very long molecule consisting of structural units and repeating units connected by covalent chemical bonds. The term is derived from the Greek words: polys meaning many, and meros meaning parts [1]. The key feature that distinguishes polymers from other molecules is the repetition of many identical, similar, or complementary molecular subunits in these chains. These subunits, the monomers, are small molecules of low to moderate molecular weight, and are linked to each other during a chemical reaction called polymerization\n\nEpoxy:\n\nEpoxy or polyepoxide is a thermosetting epoxide polymer that cures (polymerizes and crosslinks) when mixed with a catalyzing agent or "hardener". Most common epoxy resins are produced from a reaction between epichlorohydrin and bisphenol-A.
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Here you go...remember...you asked for it:\n\nhttp://www.director-file.com/cunningham/rubber.html
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<grin>\nThe wonderful thing about standards is that there so many to choose from.</grin>\n\nAre you thinking plastic or metal/glass?\nWhat country are you thinking of?\n\nDid not find anything specific but did find some leads you may want to follow up.\n\n"The Wiley Encyclopedia of Packaging Technology", Second Edition, Brody & Marsh, 1997. \n"The Handbook of Packaging Engineering", Third Edition, Hanlon, 1997.
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Polyethersulfone (PESU)\nPolyphenylene Sulfide (PPS)\nPolyvinylidinefluoride (PVDF)\n\nMany Properties of these and hundreds of materials can be found at matweb.com
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There are all kinds of different materials lumped under the generic heading of "plastics".  The variations run into hundreds, perhaps even thousands of compounds!\n\nFor example, there's nylon.  The most familiar form, nylon 66, is a copolymer of adipic acid or adipoyl chloride and hexamethylene diamine.  But I can substitue various hydrocarbon chains in those two components to make nylon 55, nylon 65, nylon 48, nylon 83, etc.\n\nThen there are the families of polyaramid polymers, and polyester polymers, and polycarbonates, and . . . .\n\nNobody will ever be able to give you an exhaustive list here.  Try looking up some books on polymer chemistry at your library.
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See if these help\n\nhttp://www.pslc.ws/macrog.htm\n\nhttp://www-classes.usc.edu/engr/ms/125/MDA125/polymers_files/frame.htm
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The cap and poly-A tail of mRNA have multiple roles. First of all, they help to prevent degradation of the mRNA molecules. Second, they help the mRNA attach to the ribosome subunits during RNA translation.
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cross-linking affects all polymers in the same way.  they will become more rigid, less soluble and thermally more stable.
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Polythene bags..\n\nethylene on polymerization will give polythene material..\n\nThats it!
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You could try the following links:\n\nhttp://www.emachineshop.com/material-plastic/acrylic.htm\n\nhttp://en.wikipedia.org/wiki/Acrylic\n\n\n\nI hope the links helped you with your question.
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The monomers are linked by covalent chemical bonds.
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Polyethylene terephthalate (aka. PET, PETE, PETP) is a thermoplastic resin of the polyester family that is used to make beverage, food and other liquid containers, synthetic fibers, as well as for some other thermoforming applications. It is also one of the most important raw materials used in man-made fibers. Depending on its processing and thermal history, it may exist both as an amorphous (transparent) and as a semi-crystalline (opaque and white) material. It can be synthesized by a transesterification reaction between ethylene glycol and dimethyl terephthalate. It is manufactured under trade names Arnite, Impet and Rynite, Hostaphan, Melinex and Mylar films, and Dacron, Terylene & Trevira fibers
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Hey buddy  you may take  a  look at this  site which offers  this  kinda  services and explains everything slightly  good:http://www.e1.greatlakes.com/corp/prodserv/jsp/optical_monomers.jsp\n\nThis also:http://industrial-adhesives.globalspec.com/Industrial-Directory/monomer_MSDS_styrene\n\nand  about  acrylic glass:http://en.wikipedia.org/wiki/Polymethyl_methacrylate
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Polyethylene (PE) comes in low density, high density and ultahigh molecular weight (UHMW) versions.  The molecule is just a straight chain hydrocarbon so it can be of any length.  Milk jugs are low density PE.  Its soft and not very tough.  As the molecules get longer, they tangle together more making UHMW very tough and wear resustance.  By ultrahigh, UHMW PE has a molecular weight in the millions.
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There are thermally-responsive hydrogels - not specifically gellatins (I think that term only applies to natural gels) - that will crystallize with temperature change.  Poly(N-isopropy acrylamide) (or PNIPA) is a commonly used gel that has a glass transition temperature around 34°C.