Molecular Structure Effects on the Secondary Relaxation and Impact Strength of a Series of Polyester Copolymer Glasses
The secondary relaxations of a series of glassy copolymers based on poly(ethylene terephthalate) (PET) and poly(1,4-cyclohexylenedimethylene terephthalate) (PCT) involve cooperative motions of the cyclohexylene rings. The cooperativity gives rise to longer range motions which create significant volu...
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Veröffentlicht in: | Macromolecules 1998-08, Vol.31 (16), p.5371-5382 |
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creator | Chen, Lisa P Yee, Albert F Goetz, Jon M Schaefer, Jacob |
description | The secondary relaxations of a series of glassy copolymers based on poly(ethylene terephthalate) (PET) and poly(1,4-cyclohexylenedimethylene terephthalate) (PCT) involve cooperative motions of the cyclohexylene rings. The cooperativity gives rise to longer range motions which create significant volume fluctuations that can facilitate macroscopic shear yielding. Comparison of the secondary loss peaks and activation energies by dynamic mechanical spectroscopy between the copolyesters and poly(cyclohexyl methacrylate) and poly(1,4-cyclohexylenedimethylene 2,5-dimethylterephthalate) indicates that the secondary relaxation of the copolyesters involve motions of the cyclohexylene ring. Dipolar rotational spin−echo 13C NMR confirmed large amplitude motions of the cyclohexylene ring faster than 10 kHz at 300 K. By examining feasible ring conformations, we conclude that transitions between chair and twist−boat conformations are possible for trans-cyclohexylene rings and cis-rings that prefer chair conformations. (Cis-rings that reside in boat conformations are more restricted.) |
doi_str_mv | 10.1021/ma971671t |
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(Cis-rings that reside in boat conformations are more restricted.)</description><identifier>ISSN: 0024-9297</identifier><identifier>EISSN: 1520-5835</identifier><identifier>DOI: 10.1021/ma971671t</identifier><identifier>CODEN: MAMOBX</identifier><language>eng</language><publisher>Washington, DC: American Chemical Society</publisher><subject>Applied sciences ; Exact sciences and technology ; Organic polymers ; Physicochemistry of polymers ; Properties and characterization ; Rheology and viscoelasticity</subject><ispartof>Macromolecules, 1998-08, Vol.31 (16), p.5371-5382</ispartof><rights>Copyright © 1998 American Chemical Society</rights><rights>1998 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a355t-61048a12e16d91d212a9df53ec933b22fa3a9a97186715739186fe4f2f2db0f3</citedby><cites>FETCH-LOGICAL-a355t-61048a12e16d91d212a9df53ec933b22fa3a9a97186715739186fe4f2f2db0f3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://pubs.acs.org/doi/pdf/10.1021/ma971671t$$EPDF$$P50$$Gacs$$H</linktopdf><linktohtml>$$Uhttps://pubs.acs.org/doi/10.1021/ma971671t$$EHTML$$P50$$Gacs$$H</linktohtml><link.rule.ids>314,780,784,2765,27076,27924,27925,56738,56788</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=2346732$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Chen, Lisa P</creatorcontrib><creatorcontrib>Yee, Albert F</creatorcontrib><creatorcontrib>Goetz, Jon M</creatorcontrib><creatorcontrib>Schaefer, Jacob</creatorcontrib><title>Molecular Structure Effects on the Secondary Relaxation and Impact Strength of a Series of Polyester Copolymer Glasses</title><title>Macromolecules</title><addtitle>Macromolecules</addtitle><description>The secondary relaxations of a series of glassy copolymers based on poly(ethylene terephthalate) (PET) and poly(1,4-cyclohexylenedimethylene terephthalate) (PCT) involve cooperative motions of the cyclohexylene rings. 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(Cis-rings that reside in boat conformations are more restricted.)</description><subject>Applied sciences</subject><subject>Exact sciences and technology</subject><subject>Organic polymers</subject><subject>Physicochemistry of polymers</subject><subject>Properties and characterization</subject><subject>Rheology and viscoelasticity</subject><issn>0024-9297</issn><issn>1520-5835</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1998</creationdate><recordtype>article</recordtype><recordid>eNptkE9P3DAQxa2qlbqFHvoNfCiVOKT4T5zEx2qhWwRVUXcPvVmDMy4BJ15sp4JvX68W7YmTn_R-M573CPnE2VfOBD8bQbe8aXl-QxZcCVapTqq3ZMGYqCstdPuefEjpnjHOVS0X5N_P4NHOHiJd5zjbPEekF86hzYmGieY7pGu0YeohPtPf6OEJ8lAMmHp6OW7B5t0gTn_zHQ2OQqHjgGmnb4J_xpQx0mXYFj0WtfKQEqZj8s6BT_jx5T0im-8Xm-WP6vrX6nL57boCqVSuGs7qDrhA3vSa94IL0L1TEq2W8lYIBxL0LnFXIqtW6iIc1k440d8yJ4_Il_3abQyPc7nFjEOy6D1MGOZkRNPUnax1AU_3oI0hpYjObOMwlsiGM7Mr1hyKLeznl6WQLHgXYbJDOgwIWTetFAWr9thQKng62BAfTPFbZTY3a9M1tVj90VfmvPAnex5sMvdhjlMp5pXv_wNtvZO4</recordid><startdate>19980811</startdate><enddate>19980811</enddate><creator>Chen, Lisa P</creator><creator>Yee, Albert F</creator><creator>Goetz, Jon M</creator><creator>Schaefer, Jacob</creator><general>American Chemical Society</general><scope>BSCLL</scope><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>8FD</scope><scope>JG9</scope></search><sort><creationdate>19980811</creationdate><title>Molecular Structure Effects on the Secondary Relaxation and Impact Strength of a Series of Polyester Copolymer Glasses</title><author>Chen, Lisa P ; Yee, Albert F ; Goetz, Jon M ; Schaefer, Jacob</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a355t-61048a12e16d91d212a9df53ec933b22fa3a9a97186715739186fe4f2f2db0f3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1998</creationdate><topic>Applied sciences</topic><topic>Exact sciences and technology</topic><topic>Organic polymers</topic><topic>Physicochemistry of polymers</topic><topic>Properties and characterization</topic><topic>Rheology and viscoelasticity</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Chen, Lisa P</creatorcontrib><creatorcontrib>Yee, Albert F</creatorcontrib><creatorcontrib>Goetz, Jon M</creatorcontrib><creatorcontrib>Schaefer, Jacob</creatorcontrib><collection>Istex</collection><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Engineered Materials Abstracts</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><jtitle>Macromolecules</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Chen, Lisa P</au><au>Yee, Albert F</au><au>Goetz, Jon M</au><au>Schaefer, Jacob</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Molecular Structure Effects on the Secondary Relaxation and Impact Strength of a Series of Polyester Copolymer Glasses</atitle><jtitle>Macromolecules</jtitle><addtitle>Macromolecules</addtitle><date>1998-08-11</date><risdate>1998</risdate><volume>31</volume><issue>16</issue><spage>5371</spage><epage>5382</epage><pages>5371-5382</pages><issn>0024-9297</issn><eissn>1520-5835</eissn><coden>MAMOBX</coden><abstract>The secondary relaxations of a series of glassy copolymers based on poly(ethylene terephthalate) (PET) and poly(1,4-cyclohexylenedimethylene terephthalate) (PCT) involve cooperative motions of the cyclohexylene rings. 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subjects | Applied sciences Exact sciences and technology Organic polymers Physicochemistry of polymers Properties and characterization Rheology and viscoelasticity |
title | Molecular Structure Effects on the Secondary Relaxation and Impact Strength of a Series of Polyester Copolymer Glasses |
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