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Topic: Condensation polymer


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In the News (Tue 18 Jun 19)

  
  Condensation polymer - Wikipedia, the free encyclopedia
Condensation polymers are any class of polymers formed through a condensation reaction, releasing (or condensing) a small molecule by-product such as water or methanol, as opposed to addition polymers which involve the reaction of unsaturated monomers.
Condensation polymerization, a form of step-growth polymerization, is a process by which two molecules join together, with the loss of a small molecule which is often water.
The most commonly known condensation polymers are proteins, fabrics such as nylon, silk, or polyester.
en.wikipedia.org /wiki/Condensation_polymer   (414 words)

  
 Step-growth polymerization - Wikipedia, the free encyclopedia
One variety of step-growth polymerization is called condensation polymerization and the product a condensation polymer because the chemical reaction by which the monomer molecules bond is often a condensation reaction that produces a small molecule byproduct.
The relationship between the extent of the reaction and the average number of monomer units in a polymer chain is given by the Carother's equation.
In practise the average length of the polymer chain is limited by such things as the purity of the reactants and the viscosity of the medium.
en.wikipedia.org /wiki/Step-growth_polymerization   (334 words)

  
 AllRefer.com - polymer (Chemistry) - Encyclopedia
An addition polymer is one in which the molecular formula of the repeating structural unit is identical to that of the monomer, e.g., polyethylene and polystyrene.
A condensation polymer is one in which the repeating structural unit contains fewer atoms than that of the monomer or monomers because of the splitting off of water or some other substance, e.g., polyesters and polycarbonates.
Polymerization, the chemical process of forming polymers from their component monomers, is often a complex process that may be initiated or sustained by heat, pressure, or the presence of one or more catalysts.
reference.allrefer.com /encyclopedia/P/polymer.html   (426 words)

  
 Kids.net.au - Encyclopedia Polymer -   (Site not responding. Last check: 2007-10-12)
Because polymers are distinguished by their constituent monomers, polymer chains within a substance are often not of equal length.
The intermolecular forces in polymers are determined by dipoles in the monomer units.
Polymers containing amide groups can form hydrogen bonds between adjacent chains; the positive hydrogen atoms in N-H groups of one chain are strongly attracted to the oxygen atoms in C=O groups on another.
www.kidsseek.com /encyclopedia-wiki/po/Polymer   (1003 words)

  
 [No title]   (Site not responding. Last check: 2007-10-12)
In one aspect, the invention relates to a surfactantless latex composition comprising (a) latex polymer particles comprising a residue of an ethylenically unsaturated monomer; (b) a sulfo-polyester polymer; and (c) a diol component; wherein the latex polymer particles are dispersed in a liquid continuous phase and wherein the latex composition is surfactantless.
The resulting condensation polymer may include the latex polymer particles derived from the surfactantless latex compositions, wherein the latex polymer particles may be dispersed in the condensation polymer continuous phase, so as to form a latex/condensation polymer blend.
As noted previously, such polymers may be formed by closely matching the refractive index of a polymer utilized as the latex polymer with the refractive index of the condensation polymer matrix.
www.wipo.int /cgi-pct/guest/getbykey5?KEY=01/27177.010419&ELEMENT_SET=DECL   (12274 words)

  
 Condensation reaction - Wikipedia, the free encyclopedia
A condensation reaction (also known as a dehydration reaction or dehydration synthesis when water is lost) is a chemical reaction in which two molecules or moieties react and become covalently bonded to one another by the concurrent loss of a small molecule, often water, methanol, or a type of hydrogen halide such as HCl.
Other condensations, such as the acyloin condensation are triggered by radical or single electron transfer conditions.
This type of reaction is used as a basis for the making of many important polymers for example: nylon, polyester and other condensation polymers and various epoxies.
en.wikipedia.org /wiki/Condensation_reaction   (384 words)

  
 Condensation polymer: Facts and details from Encyclopedia Topic   (Site not responding. Last check: 2007-10-12)
A condensation reaction (also known as a dehydration reaction or dehydration synthesis) is a chemical reaction in which two molecules or moieties...
An addition polymer is a polymer which is formed by an addition reaction, where many monomers have bonded together via rearrangement of bonds without the loss of...
Isotactic polymers refer to those polymers formed by branched monomers that have the characteristic of having all the branch groups on the same side of the...
www.absoluteastronomy.com /encyclopedia/c/co/condensation_polymer.htm   (1164 words)

  
 Macromolecules: Natural and Synthetic Polymers
Polymers are substances composed of extremely large molecules termed macromolecules, with molecular masses ranging from 104 to 108 amu.
Polymers that can be repeatedly melted and solidified (without damage) are said to be thermoplasts; those that solidify once but will not melt again with damage are said to be thermosets.
Polymers of all types in which the long chains are produced by joining two or more different kinds of monomers are termed copolymers.
www.owlnet.rice.edu /~chem122/lab/polymers   (2690 words)

  
 Fall 2000 Polymer Highlights and Study Guide   (Site not responding. Last check: 2007-10-12)
Polymers are large molecules made by forming chemical bonds among a group of smaller chemical units.
Condensation polymers have the name because some component of the reactants is "condensed away", often the leaving species is water.
Polymers can be made more rigid by adding bulky substituents to the monomers so that the chains have trouble sliding past each other.
chemweb.calpoly.edu /chem/maxwell/polymer.html   (868 words)

  
 Definitions of Terms   (Site not responding. Last check: 2007-10-12)
The decision to classify a polymer as branched or cross-linked is based on the extent to which the side-chains on the polymer backbone link adjacent polymer chains.
Cross-linked polymers are insoluble in all solvents because the polymer chains are tied together by strong covalent bonds.
Note that the repeating unit in a condensation polymer is inevitably smaller than the monomer from which it is made.
chemed.chem.purdue.edu /genchem/topicreview/bp/1polymer/terms.html   (1369 words)

  
 Chemical of the Week -- Polymers
Synthetic polymers are produced commercially on a very large scale and have a wide range of properties and uses.
Polymers are classified by the characteristics of the reactions by which they are formed.
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.
scifun.chem.wisc.edu /chemweek/POLYMERS/Polymers.html   (1917 words)

  
 [No title]   (Site not responding. Last check: 2007-10-12)
The extent to which the inorganic fillers affect polymer properties is closely associated with the volume fraction of filler incorporated into the polymer, the particle size of the filler and the degree to which the filler is bound to the polymer matrix.
In both condensation and addition polymerizations, the performance of the polymer- filler compound is strongly dependent on the strength of the interaction between polymer and filler.
A polymer comprising a first carboxylate-alumoxane functionalized with a first chemically reactive substituent and a second carboxylate-alumoxane functionalized with a second chemically reactive substituent, wherein said first and second carboxylate-alumoxanes are chemically bonded to each other.
www.wipo.int /cgi-pct/guest/getbykey5?KEY=00/09578.000224&ELEMENT_SET=DECL   (11143 words)

  
 Chemical of the Week -- Polymers
Polymers are substances whose molecules have high molar masses and are composed of a large number of repeating units.
Polymers are formed by chemical reactions in which a large number of molecules called monomers are joined sequentially, forming a chain.
Polyacrylamide is a condensation polymer with an unusual and useful property.
scifun.chem.wisc.edu /chemweek/Polymers/Polymers01.html   (2138 words)

  
 Polymers: Glossary
Bakelite: a polymer produced by the condensation of phenol and formaldehyde.
condensation polymer: one in which two or more molecules combine resulting in elimination of water or other simple molecules, with the process being repeated to form a long chain molecule.
thermoplastic: a polymer which may be softened by heat and hardened by cooling in a reversible physical process.
matse1.mse.uiuc.edu /~tw/polymers/glos.html   (428 words)

  
 New Jersey Scuba Diver - Artifacts & Shipwrecks - Polymer Materials
Polymer materials - rubbers, plastics, and silicones - are not really of interest as artifacts.
A polymer is a chemical compound with high molecular weight consisting of a number of structural units linked together by covalent bonds.
Silicone rubbers are organic derivatives of inorganic polymers, e.g., the polymer of dimethysilanediol.
www.njscuba.net /artifacts/matl_polymers.html   (7007 words)

  
 KCPC Education Resource Web Site: Cellulose
Cellulose is a structural polymer found in all 'higher' plants.
The ether linkage is equivalent to the loss of water formed by condensation of between the 1-hydroxy group of one glucose unit and the 4-hydroxy group of another.
The likeness to condensation polymers is even stronger when you consider the depolymerisation reactions that can occur.
www.kcpc.usyd.edu.au /discovery/9.2.2/9.2.2_Cellulose.html   (369 words)

  
 Chemistry : Chapter 18 : Overview   (Site not responding. Last check: 2007-10-12)
Cotton is a polysaccharide, a polymer of sugars.
The first synthetic polymer, nylon, was created by a condensation reaction and is thus a condensation polymer.
Polymers can be made isotatic or atatic by controlling reaction conditions.
www.wwnorton.com /chemistry/overview/ch18.htm   (1212 words)

  
 Chapter Three: First Part
A condensation polymer can be defined as a polymer in which the structural unit contains fewer atoms than the monomer or monomers from which the polymer is derived.
This is taken to mean that the fastest polymerization rate occurs for a polymer with eight carbons in the ring.
A dianhydride and a tetraamine react to form a polyimide that is an example of a ladder polymer.
web.umr.edu /~wlf/CHEM381/chap31.html   (2001 words)

  
 [No title]
Condensation polymerization is a reaction in which not all the atoms in the starting monomers are incorporated in the polymer because water is split out as the polymer is formed.
A thermosetting polymer is a polymer that can softened of remolded.
A silicone is a polymer based on a series of alternation silicon and oxygen atoms.
academics.vmi.edu /chem_jt/CH132/3-1-10Homework.doc   (780 words)

  
 Condensation Polymers   (Site not responding. Last check: 2007-10-12)
Polyesters such as PET (polyethylene terephthalate) are condensation polymers.
This same polymer with the trade name of mylar when made as "tape" is magnetically coated for use in tape recorders and videotape machines.
Technically polyurethane is not a condensation polymer since no molecules are lost, but the functional group does rearrange.
www.elmhurst.edu /~chm/vchembook/402condensepolymers.html   (525 words)

  
 Putting Them Together
But a condensation polymer is more like a snotty social club that says, "Sure you can join, but only if you ditch those friends of yours".
When nylon 6,6 is made from adipoyl chloride and hexamethylene diamine, the chlorine atoms from the adipoyl chloride, each along with one of the amine hydrogen atoms, are expelled in the form of HCl gas.
Because there is less mass in the polymer than in the original monomers, we say that the polymer is condensed with regard to the monomers.
www.pslc.ws /mactest/synth.htm   (987 words)

  
 Chemistry 12 - Chapter 2 Quiz
Polymers such as nylon are formed from monomer subunits that are identical.
are a result of hydrogen bonding between the ribose–phosphate backbone of the polymer chains.
indicate the position of the hydroxyl groups in the carbon chain of the polymer.
www.nelson.com /nelson/school/secondary/science/0176259864/quizzes/c12-ch2.htm   (319 words)

  
 Polymers: Demonstartion 3   (Site not responding. Last check: 2007-10-12)
Many diamines and diacids (or diacid chlorides) can be reacted to make other condensation products that are described by the generic name "nylon." One such product is an important commercial polyamide, nylon 6-6, which can be prepared by substituting adipoyl chloride for Sebacoyl chloride in the procedure described here.
With forceps, grasp the polymer film that forms at the interface of the two solutions and pull it carefully from the center of the beaker.
Wind the polymer thread on a stirring rod or a small windlass.
matse1.mse.uiuc.edu /~tw/polymers/c.html   (495 words)

  
 Silicone 7. Understanding of Polymer Chemistry, Thermochemistry and Kinetics   (Site not responding. Last check: 2007-10-12)
Polymers are giant molecules, long sequences of chemical units bonded together.
Condensation polymers form in a series of condensation reactions in which two molecules react with the elimination of a small molecule such as water.
Cellulose, DNA, RNA, nylon and the silicones are condensation polymers.
www.chemcases.com /silicon/sil7cone.htm   (747 words)

  
 Enhanced Polymer Searching in CAS Files   (Site not responding. Last check: 2007-10-12)
In addition, starting in 2003 polymer index entries in CAplus and CA are being enhanced by including multiple trade names and information about assumed monomers used to register a polymer.
In addition, for condensation polymers for which the structure of the unit that repeats down the polymer backbone can be identified unambiguously, another CAS Registry Number is assigned based on the unambiguous SRU.
A condensation polymer is formed when monomer molecules combine, resulting in the loss of a small molecule such as water.
www.cas.org /ONLINE/STN/STNOTES/stnote30.html   (826 words)

  
 KCPC Education Resource Web Site: Condensation Polymerisation: PET
In a condensation polymerisation reaction (sometimes called step-growth polymerisation), two monomer molecules react together to form a dimer (two molecules joined together), which can in turn react with other monomer and dimer molecules, etc., until a long polymer is formed.
Two different functional groups are involved in any condensation polymerisation; these may be on two different monomer species (AA and BB) or on the same monomer (AB).
Another condensation polymerisation is the preparation of nylon-6,6, in which a peptide bond is generated:
www.kcpc.usyd.edu.au /discovery/9.2.2/9.2.2_PET.html   (213 words)

  
 Condensation - condensation: Definition, Synonyms and Much More From Answers.com
Condensation forms under/on roof sheeting when the sheeting becomes colder than the air in contact with it.
Bose–Einstein Condensation in Dilute Gases - Cambridge University
Condensation is the opposite: the change from gas to liquid.
jesse-james.recommendlist.com /rl/jesse-james-condensation.htm   (211 words)

  
 [No title]   (Site not responding. Last check: 2007-10-12)
b) a thermal bonding polymer layer on said oriented polymer layer inner surface substantially coextensive thereto, said thermal bonding polymer layer having a thickness between 10% and 40% of a combined thickness of the oriented polymer film layer and the thermal bonding polymer layer; and
wherein the oriented polymer film layer, the thermal bonding polymer layer, and the reinforcing scrim polymer layer in said tear resisting composite layer each individually comprise a synthetic condensation polymer,
at least 90 mol % of a combined total amount of the amino acid or the mixture of amino acids in the synthetic condensation polymers is the same amino acid.
www.uspto.gov /web/patents/patog/week11/OG/html/1304-2/US07012032-20060314.html   (388 words)

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