polymer chemistry meaning

{ bidder: 'sovrn', params: { tagid: '446382' }}, { bidder: 'triplelift', params: { inventoryCode: 'Cambridge_Billboard' }}, { bidder: 'sovrn', params: { tagid: '705055' }}, var mapping_rightslot2 = googletag.sizeMapping().addSize([746, 0], [[300, 250], [120, 600], [160, 600]]).addSize([0, 0], []).build(); Synthetic polymers are used to make plastics, adhesives, paints, mechanical parts, and many common objects. The word polymer comes from the Greek prefix poly-, which means "many," and the suffix -mer, which means "parts." iasLog("exclusion label : resp"); Natural polymers have been used since ancient times, but mankind's ability to intentionally synthesize polymers is a fairly recent development. { bidder: 'appnexus', params: { placementId: '11653860' }}, bids: [{ bidder: 'rubicon', params: { accountId: '17282', siteId: '162036', zoneId: '776160', position: 'atf' }}, She has taught science courses at the high school, college, and graduate levels. {code: 'ad_rightslot', pubstack: { adUnitName: 'cdo_rightslot', adUnitPath: '/2863368/rightslot' }, mediaTypes: { banner: { sizes: [[300, 250]] } }, {code: 'ad_topslot_b', pubstack: { adUnitName: 'cdo_topslot', adUnitPath: '/2863368/topslot' }, mediaTypes: { banner: { sizes: [[728, 90]] } }, {code: 'ad_topslot_b', pubstack: { adUnitName: 'cdo_topslot', adUnitPath: '/2863368/topslot' }, mediaTypes: { banner: { sizes: [[728, 90]] } }, {code: 'ad_btmslot_a', pubstack: { adUnitName: 'cdo_btmslot', adUnitPath: '/2863368/btmslot' }, mediaTypes: { banner: { sizes: [[300, 250]] } }, "plastics"). dfpSlots['houseslot_b'] = googletag.defineSlot('/2863368/houseslot', [], 'ad_houseslot_b').defineSizeMapping(mapping_houseslot_b).setTargeting('sri', '0').setTargeting('vp', 'btm').setTargeting('hp', 'center').setCategoryExclusion('house').addService(googletag.pubads()); { bidder: 'triplelift', params: { inventoryCode: 'Cambridge_Billboard' }}, { bidder: 'openx', params: { unit: '539971080', delDomain: 'idm-d.openx.net' }}, type: "html5", { bidder: 'criteo', params: { networkId: 7100, publisherSubId: 'cdo_rightslot2' }}, The branch of chemistry concerned with the preparation and properties of polymers. { bidder: 'onemobile', params: { dcn: '8a969411017171829a5c82bb4deb000b', pos: 'cdo_leftslot_160x600' }}, ThoughtCo uses cookies to provide you with a great user experience. Définition POLYMERE publiée le 10/01/2008 (mise à jour le 25/10/2020), par l'équipe d'auteurs-rédacteurs. When nitrocellulose was treated with camphor, it produced celluloid, a polymer widely used in the film industry and as a moldable replacement for ivory. }, They are found widely in the natural world (e.g. {code: 'ad_btmslot_a', pubstack: { adUnitName: 'cdo_btmslot', adUnitPath: '/2863368/btmslot' }, mediaTypes: { banner: { sizes: [[300, 250], [320, 50], [300, 50]] } }, polymer. { bidder: 'appnexus', params: { placementId: '11653860' }}, iasLog("exclusion label : wprod"); { bidder: 'appnexus', params: { placementId: '11654156' }}, }, Todd Helmenstine Science. }); }, },{ Polymer… { bidder: 'sovrn', params: { tagid: '387233' }}, { bidder: 'pubmatic', params: { publisherId: '158679', adSlot: 'cdo_rightslot' }}]}, 2017 - vol. { bidder: 'ix', params: { siteId: '195451', size: [300, 50] }}, 'min': 3.05, iasLog("exclusion label : lcp"); }] var pbTabletSlots = [ iasLog("criterion : cdo_c = " + ["science_geographic_locales"]); { bidder: 'appnexus', params: { placementId: '11653860' }}, iasLog("criterion : cdo_l = en"); These are words often used in combination with polymer. dfpSlots['topslot_a'] = googletag.defineSlot('/2863368/topslot', [], 'ad_topslot_a').defineSizeMapping(mapping_topslot_a).setTargeting('sri', '0').setTargeting('vp', 'top').setTargeting('hp', 'center').addService(googletag.pubads()); While thermoset plastics form irreversible chemical bonds when cured, the bonding in thermoplastics weakens with temperature. } params: { { bidder: 'appnexus', params: { placementId: '11654157' }}, googletag.pubads().setTargeting("cdo_t", "science"); There appears to be no correlation between the fitted relaxation time and the. Because the molecules consist of many monomers, polymers tend to have high molecular masses. {code: 'ad_topslot_a', pubstack: { adUnitName: 'cdo_topslot', adUnitPath: '/2863368/topslot' }, mediaTypes: { banner: { sizes: [[300, 50], [320, 50], [320, 100]] } }, Homopolymer Definition in Chemistry Share Flipboard Email Print This is the chemical structure of the homopolymer polyvinyl chloride. Figure 13 shows the mean velocity profiles for x-locations between 25 and 200 mm downstream of the injectors during, A ramp-filling procedure applied to filling, If liquid paint with volatile solvent is deposited on a substrate, we can assume that initially the, The targeting ligand is covalently coupled to the drug, making the efficiency of drug loading and uptake comparatively lower than in. { bidder: 'sovrn', params: { tagid: '346688' }}, 'cap': true "sign-out": "https://dictionary.cambridge.org/auth/signout?rid=READER_ID" When nitrocellulose was dissolved in ether and alcohol, it became collodion. dfpSlots['rightslot2'] = googletag.defineSlot('/2863368/rightslot2', [[300, 250], [120, 600], [160, 600]], 'ad_rightslot2').defineSizeMapping(mapping_rightslot2).setTargeting('sri', '0').setTargeting('vp', 'mid').setTargeting('hp', 'right').addService(googletag.pubads()); { bidder: 'sovrn', params: { tagid: '387233' }}, storage: { { bidder: 'onemobile', params: { dcn: '8a969411017171829a5c82bb4deb000b', pos: 'cdo_leftslot_160x600' }}, }], 'increment': 0.5, Polymers make up many of the materials in living organisms, and they constitute the basis of certain minerals and human-made materials, such as paper and plastics. Les molécules initiales peuvent être des monomères ou des pré-polymères ; la synthèse conduit à des polymères. Bakelite, Kevlar, and vulcanized rubber are also thermoset plastics. { bidder: 'openx', params: { unit: '541042770', delDomain: 'idm-d.openx.net' }}, 9. pbjs.que.push(function() { bids: [{ bidder: 'rubicon', params: { accountId: '17282', siteId: '162036', zoneId: '776156', position: 'atf' }}, Biopolymers serve key functions in organisms, acting as structural proteins, functional proteins, nucleic acids, structural polysaccharides, and energy storage molecules. var mapping_topslot_b = googletag.sizeMapping().addSize([746, 0], [[728, 90]]).addSize([0, 0], []).build(); userSync: { iasLog("criterion : cdo_tc = resp"); Polymers are substances composed of macromolecules, very large molecules with molecular weights ranging from a few thousand to as high as millions of grams/mole. { bidder: 'onemobile', params: { dcn: '8a969411017171829a5c82bb4deb000b', pos: 'cdo_btmslot_300x250' }}, 'max': 8, The process of vulcanizing rubber by adding sulfur and applying heat was described by British engineer Thomas Hancock (1786–1865) in 1843 (UK patent) and American chemist Charles Goodyear (1800–1860) in 1844. { bidder: 'openx', params: { unit: '539971063', delDomain: 'idm-d.openx.net' }}, By using ThoughtCo, you accept our, Plastic Definition and Examples in Chemistry, Biological Polymers: Proteins, Carbohydrates, Lipids, A Brief History of the Invention of Plastics, Ph.D., Biomedical Sciences, University of Tennessee at Knoxville, B.A., Physics and Mathematics, Hastings College. googletag.cmd.push(function() { Browse our dictionary apps today and ensure you are never again lost for words. { bidder: 'pubmatic', params: { publisherId: '158679', adSlot: 'cdo_topslot' }}]}, googletag.pubads().setTargeting("cdo_tc", "resp"); { bidder: 'openx', params: { unit: '539971080', delDomain: 'idm-d.openx.net' }}, Find an article. 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"sign-up": "https://dictionary.cambridge.org/auth/signup?rid=READER_ID", { bidder: 'openx', params: { unit: '539971079', delDomain: 'idm-d.openx.net' }}, • The small building-block molecules are called monomers. bids: [{ bidder: 'rubicon', params: { accountId: '17282', siteId: '162036', zoneId: '776130', position: 'btf' }}, { bidder: 'sovrn', params: { tagid: '346693' }}, { bidder: 'ix', params: { siteId: '195466', size: [728, 90] }}, { bidder: 'openx', params: { unit: '539971080', delDomain: 'idm-d.openx.net' }}, "error": true, Unlike thermosets, which decompose rather than melt, thermoplastics melt into a liquid upon heating. { bidder: 'ix', params: { siteId: '195465', size: [300, 250] }}, "sign-in": "https://dictionary.cambridge.org/auth/signin?rid=READER_ID", bids: [{ bidder: 'rubicon', params: { accountId: '17282', siteId: '162036', zoneId: '1666926', position: 'btf' }}, name: "_pubcid", { bidder: 'pubmatic', params: { publisherId: '158679', adSlot: 'cdo_topslot' }}]}, { bidder: 'openx', params: { unit: '539971065', delDomain: 'idm-d.openx.net' }}, Define polymer. googletag.pubads().setCategoryExclusion('lcp').setCategoryExclusion('resp').setCategoryExclusion('wprod'); { bidder: 'ix', params: { siteId: '195466', size: [728, 90] }}, googletag.pubads().setTargeting('cdo_alc_pr', pl_p.split(",")); },{ { bidder: 'onemobile', params: { dcn: '8a969411017171829a5c82bb4deb000b', pos: 'cdo_btmslot_300x250' }}, { bidder: 'ix', params: { siteId: '195451', size: [300, 50] }}, 2 Natural Polymers Three types of natural polymers are polysaccharides, proteins, and nuclei acids. { bidder: 'openx', params: { unit: '539971066', delDomain: 'idm-d.openx.net' }}, iasLog("criterion : sfr = cdo_dict_english"); name: "idl_env", dfpSlots['rightslot'] = googletag.defineSlot('/2863368/rightslot', [[300, 250]], 'ad_rightslot').defineSizeMapping(mapping_rightslot).setTargeting('sri', '0').setTargeting('vp', 'mid').setTargeting('hp', 'right').addService(googletag.pubads());

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