what is a cross linked polymer?
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A polymer is a a bunch ("poly") of chemically bonded chain members ("mers")\n\nA very common example is polyethylene, in which the mer is ethylene:\n\nCH2=CH2   ----> [-CH2-CH2-]n\n\nThis results in a linear chain.\n\nAn appropriate mer for polymerization must have some kind of way to bond to at least two other mers.  A double bond can be opened to form bonds with two other things.  Carboxylic acids can form bonds with alcohols and amines to form ester or amide linkages.\n\nIf you have the ability to form MORE than 2 bonds with other mers, you have the ability to form a crosslinked polymer (sometimes called a network polymer)\n\nFor example, if you have a di-acid molecule, it could form a polymer with a di-alcohol.  If you use glycerol as your alcohol (glycerol has 3 alcohol groups instead of 2) you can form a cross-linked network polymer.\n\nAnother way to form a crosslinked polymer is if useful chemistry remains in the polymer after the polymerization reaction.  For example, butadiene has two double bonds in it, and after the polymerization reaction, it still has one double bond per mer unit in the chain.  If you add sulfur to the polymer and heat it up, the sulfur can react with the existing double bonds to form disulfide bridges that connect two chains together--these are called cross-links.\n\nThe vulcanization of rubber is an example of chemically crosslinking a polymer (butadiene is chemically similar to rubber).  Tires are made out of this rubber.\n\nCross links provide a mechanical limitation on the stretchability of polymers.  Normally, a polymer can be stretched slowly because over time the chains can slide past each other (like pulling apart noodles from a pot of cooked spaghetti).  Cross links prevent the noodles from sliding past each other because all the noodles are mechanically bonded to each other at a few places.
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http://www.rc.net/wcc/cross.htm
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I dont know this might help or not\n\nhttp://www.google.co.uk/search?hl=en&q=degree+in+polymer+technology+in+u.k&btnG=Search&meta=
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Polymers that are very elastic or have the abiliry to stretch
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Polythene bags..\n\nethylene on polymerization will give polythene material..\n\nThats it!
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an example of a network covalent compound is silicon dioxide, in quartz form, it's empirical formula is SiO2 but it is cross linked etc to form huge complexes.\n\nA Marco molecule is one that has a distinct chemical molecule structure or formula, but is rather large.  An example is Fullerenes.
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The term is polymerization.  This can refer to the making of polysaccharides from simple sugars as mentioned above.  It can also mean the making of DNA or RNA from single nucleotides, the making of protein peptides from singel amino acids, or the making of polymer plastics from smaller maolecules.  The idea is that several monomers (free units that have a joining point at each end) can link together like a chain making a polymer.  There are more examples than the four here, but those four are the most common.
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A complex molecule formed by the joining of many simple molecules is known as a Polymer(example as poly-ethene or polythene). Sorry, I don't know the latter part of your question.
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polymethacrylate resin is the synthetic polymer of methyl methacrylate. This thermoplastic and transparent plastic is sold by the tradenames Plexiglas, Perspex, Acrylite, Acrylplast, and Lucite and is commonly called acrylic glass or simply acrylic.
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In addition polymerization, many small units of the same type called monomers combine to form a long chain of a polymer, with simple covalent bonds and no loss of a molecule. For this polymerization to occur, the monomer must have a C=C double bond, because polymerization takes place across the double bond E.g. formation of polyethene from ethene; polypropene from propene etc.\n\nIn condensation polymerization, two same monomers or two different monomers combine to form a polymer, with the elimination of a small molecule like H20. Here, a double bond need not be present. E.g. formation of proteins from aminoacids etc.
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Well that is a loaded question. But I will try and simplify it as much as possible. A polymer is a molecule or compound whose intrinsic shape allows it to attach to others like itself.  ( it gets deeper than this but I am trying to keep it simple) polymers are common both in nature (Gaba Bean) and syntetically.  As amatter of fact you probabbly have several polymers in your place of residence at this moment.\n\nNow for some meat, Most Plastics are by definition polymers. for example PVC Pipe or poly Vinyl chloride is nothing more than a continuois linking of thsame molecule.  On another note Gelatin is a polymer that puts the jiggle in jello. when this polymer is combined with water and subjected to temperature a polymerization reaction occurs which is nothng more than the gelatin bonding to itself forming a latice network that "coagulates" the water into the desire of all children.  Polymerization goes much deeper than this but I hope you get the point.  If you dont then try this illistration. humans are basically identicle in shape. gather as many of your friends together as possible an hold hands. you have now demontrated the basic idea of polymerization.  I appreciate your interest in knowledge. How can anyone expect to gain knowledge if they never ask.
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Here is a link to a "Polymer Physical Property Comparison Chart."\nhttp://www.lauren.com/Technical_Info/physical_properties.asp
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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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Polymers can be made through a process called ADDITION POLYMERISATION.\n\nPolymers are made from starting materials known as MONOMERS. In addition polymerisation, the monomer is a member of a family of compounds known as the ALKENES.\n\nDuring the polymerisation, the carbon to carbon double bond that exists in all alkenes is broken apart and the resulting molecules join together to form a straight chain molecule.\n\ne.g. the polymerisation of hundreds of ethene monomers will result in the polymer POLYETHENE.
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It's a carbon-hydrogen chain. \nIt is used in organic reactions.
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Polymers are substances whose molecules have high molar masses and are composed of a large number of repeating units. There are both naturally occurring and synthetic polymers. Among naturally occurring polymers are proteins, starches, cellulose, and latex. Synthetic polymers are produced commercially on a very large scale and have a wide range of properties and uses. The materials commonly called plastics are all synthetic polymers. \n\n  \n\n             Polymers are formed by chemical reactions in which a large number of molecules called monomers are joined sequentially, forming a chain. In many polymers, only one monomer is used. In others, two or three different monomers may be combined. Polymers are classified by the characteristics of the reactions by which they are formed. If all atoms in the monomers are incorporated into the polymer, the polymer is called an addition polymer. If some of the atoms of the monomers are released into small molecules, such as water, the polymer is called a condensation polymer. Most addition polymers are made from monomers containing a double bond between carbon atoms. Such monomers are called olefins, and most commercial addition polymers are polyolefins. Condensation polymers are made from monomers that have two different groups of atoms which can join together to form, for example, ester or amide links. Polyesters are an important class of commercial polymers, as are polyamides (nylon).
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Perhaps this site can help: http://www.devicelink.com/mddi/archive/00/01/008.html\n\n"The process of plasma surface modification on polymer, fluoropolymer, and other plastic surfaces can be divided into four distinct mechanisms: ablation, cross-linking, activation, and deposition."