Crystallinity and amorphous segmental properties in random propylene-ethylene copolymers: NMR correlation
We present a characterization of the state of semi‐crystallization of random propylene–ethylene copolymers, observing the transverse relaxation of protons attached to the chains. The degree of crystallinity was determined step by step, from NMR, during the progressive annealing of the copolymers, qu...
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| Veröffentlicht in: | Polymer international 1999-07, Vol.48 (7), p.558-564 |
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| creator | Dujourdy, L Bazile, J P Cohen-Addad, J P |
| description | We present a characterization of the state of semi‐crystallization of random propylene–ethylene copolymers, observing the transverse relaxation of protons attached to the chains. The degree of crystallinity was determined step by step, from NMR, during the progressive annealing of the copolymers, quenched at room temperature from the melt. The ethylene content varied over the range 0–4.7 (w/w). It is shown that the empirical temperature dependence of the degree of crystallinity, as detected by NMR, obeys a single curve; this curve is translated along the temperature axis in accordance with the melting point depression when the ethylene content varies. The degree of crystallinity is primarily a function of the undercooling, whatever the ethylene content. Considering any state of semi‐crystallization, a strong correlation between the degree of crystallinity and the relaxation rate of the protons attached to amorphous segments is established; the NMR sensitivity to crystallinity is considerably enhanced when detected by amorphous properties.
© 1999 Society of Chemical Industry |
| doi_str_mv | 10.1002/(SICI)1097-0126(199907)48:7<558::AID-PI196>3.0.CO;2-4 |
| format | Article |
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© 1999 Society of Chemical Industry</description><subject>Applied sciences</subject><subject>crystallinity</subject><subject>Crystallization</subject><subject>Exact sciences and technology</subject><subject>NMR</subject><subject>Organic polymers</subject><subject>Physicochemistry of polymers</subject><subject>Properties and characterization</subject><subject>propylene-ethylene copolymer</subject><issn>0959-8103</issn><issn>1097-0126</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1999</creationdate><recordtype>article</recordtype><recordid>eNqFkFtv1DAQRiMEEkvhP-QBofYhix3HdrxcpJJCG6l0Ebc-jlzvLHVxLtipIP8eZ1MtDyDxZHs8PvP5JMkrSpaUkPz54ae6qo8oUTIjNBeHVClF5FFRruRLzsvV6rg-yT7UVInXbEmW1fpFnhX3ksX-xf1kQRRXWUkJe5g8CuGGEFJGyiKxlR_DoJ2zrR3GVLebVDed76-725AG_NZgG2_T3nc9-sFiSG2b-tjWNbvi6LDFDIfr3SY1Xd-5sUEfVunF-4_x7D06PdiufZw82GoX8MndepB8eff2c3WWna9P6-r4PDOFFCLDDWdEsw2j5YZoTbeCE0VylIWUPKfGkBKVkZRtjUCFkpecXRnFrrhWkhFkB8mzmRvj_bjFMEBjg0HndIvxU5CLKE_kBdsHML4LweMWem8b7UegBCbxAJN4mDTCpBFm8VCUICGKB4jiYSceGBCo1pDDxH16F0AHo9022jI2_IGrQolCxravc9tP63D8a_Z_Rv9r8lyI4GwG2zDgrz1Y--8gJJMcLi9O4Q29PDmjlQDJfgN88rNP</recordid><startdate>199907</startdate><enddate>199907</enddate><creator>Dujourdy, L</creator><creator>Bazile, J P</creator><creator>Cohen-Addad, J P</creator><general>John Wiley & Sons, Ltd</general><general>Wiley</general><scope>BSCLL</scope><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>8FD</scope><scope>F28</scope><scope>FR3</scope><scope>JG9</scope></search><sort><creationdate>199907</creationdate><title>Crystallinity and amorphous segmental properties in random propylene-ethylene copolymers: NMR correlation</title><author>Dujourdy, L ; Bazile, J P ; Cohen-Addad, J P</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c4766-ed530a3d318d0aa1f650902e7477521cc08e9c713fc6e9e75853bc93b5a9730e3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1999</creationdate><topic>Applied sciences</topic><topic>crystallinity</topic><topic>Crystallization</topic><topic>Exact sciences and technology</topic><topic>NMR</topic><topic>Organic polymers</topic><topic>Physicochemistry of polymers</topic><topic>Properties and characterization</topic><topic>propylene-ethylene copolymer</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Dujourdy, L</creatorcontrib><creatorcontrib>Bazile, J P</creatorcontrib><creatorcontrib>Cohen-Addad, J P</creatorcontrib><collection>Istex</collection><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Engineered Materials Abstracts</collection><collection>Technology Research Database</collection><collection>ANTE: Abstracts in New Technology & Engineering</collection><collection>Engineering Research Database</collection><collection>Materials Research Database</collection><jtitle>Polymer international</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Dujourdy, L</au><au>Bazile, J P</au><au>Cohen-Addad, J P</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Crystallinity and amorphous segmental properties in random propylene-ethylene copolymers: NMR correlation</atitle><jtitle>Polymer international</jtitle><addtitle>Polym. Int</addtitle><date>1999-07</date><risdate>1999</risdate><volume>48</volume><issue>7</issue><spage>558</spage><epage>564</epage><pages>558-564</pages><issn>0959-8103</issn><eissn>1097-0126</eissn><abstract>We present a characterization of the state of semi‐crystallization of random propylene–ethylene copolymers, observing the transverse relaxation of protons attached to the chains. The degree of crystallinity was determined step by step, from NMR, during the progressive annealing of the copolymers, quenched at room temperature from the melt. The ethylene content varied over the range 0–4.7 (w/w). It is shown that the empirical temperature dependence of the degree of crystallinity, as detected by NMR, obeys a single curve; this curve is translated along the temperature axis in accordance with the melting point depression when the ethylene content varies. The degree of crystallinity is primarily a function of the undercooling, whatever the ethylene content. Considering any state of semi‐crystallization, a strong correlation between the degree of crystallinity and the relaxation rate of the protons attached to amorphous segments is established; the NMR sensitivity to crystallinity is considerably enhanced when detected by amorphous properties.
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| issn | 0959-8103 1097-0126 |
| language | eng |
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| subjects | Applied sciences crystallinity Crystallization Exact sciences and technology NMR Organic polymers Physicochemistry of polymers Properties and characterization propylene-ethylene copolymer |
| title | Crystallinity and amorphous segmental properties in random propylene-ethylene copolymers: NMR correlation |
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