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Crystallinity changes and melting behavior of the uniaxially oriented iPP exposed to high doses of gamma radiation
Samples of isotactic polypropylene (iPP) oriented via solid-state stretching at elevated temperature (draw ratios of 1, 3, 5, 7.5, 10, 12.5 and 15) were analyzed. Gel content measurements, wide-angle X-ray diffraction (WAXD) and differential scanning calorimetry (DSC) were used to study the effects...
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Published in: | Polymer degradation and stability 2005-02, Vol.87 (2), p.279-286 |
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container_title | Polymer degradation and stability |
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creator | STOJANOVIC, Z KACAREVIC-POPOVIC, Z GALOVIC, S MILICEVIC, D SULJOVRUJIC, E |
description | Samples of isotactic polypropylene (iPP) oriented via solid-state stretching at elevated temperature (draw ratios of 1, 3, 5, 7.5, 10, 12.5 and 15) were analyzed. Gel content measurements, wide-angle X-ray diffraction (WAXD) and differential scanning calorimetry (DSC) were used to study the effects of high absorbed doses of gamma irradiation, up to 700
kGy. Conclusions derived according to the different methods are compared. The results indicate that the changes in the structure of pristine iPP due to orientation also significantly affect the radiation induced changes in crystallinity, melting behavior and gel production. The role of highly strained tie molecules in radiation-induced increase in crystallinity at doses lower than 250
kGy, for oriented iPP is discussed in terms of the scission and strain-energy relief process on the crystals followed by the growth of new, thin-crystal, lamellae. At higher doses (300, 500 and 700
kGy) radiation-induced decrease in crystallinity is explained in terms of the effect of crosslinking. Orientation induced supermolecular structural changes are related to the decrease in the gel production with draw ratio. |
doi_str_mv | 10.1016/j.polymdegradstab.2004.07.021 |
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kGy. Conclusions derived according to the different methods are compared. The results indicate that the changes in the structure of pristine iPP due to orientation also significantly affect the radiation induced changes in crystallinity, melting behavior and gel production. The role of highly strained tie molecules in radiation-induced increase in crystallinity at doses lower than 250
kGy, for oriented iPP is discussed in terms of the scission and strain-energy relief process on the crystals followed by the growth of new, thin-crystal, lamellae. At higher doses (300, 500 and 700
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kGy. Conclusions derived according to the different methods are compared. The results indicate that the changes in the structure of pristine iPP due to orientation also significantly affect the radiation induced changes in crystallinity, melting behavior and gel production. The role of highly strained tie molecules in radiation-induced increase in crystallinity at doses lower than 250
kGy, for oriented iPP is discussed in terms of the scission and strain-energy relief process on the crystals followed by the growth of new, thin-crystal, lamellae. At higher doses (300, 500 and 700
kGy) radiation-induced decrease in crystallinity is explained in terms of the effect of crosslinking. Orientation induced supermolecular structural changes are related to the decrease in the gel production with draw ratio.</description><subject>Applied sciences</subject><subject>DSC</subject><subject>Exact sciences and technology</subject><subject>Gamma irradiation</subject><subject>Gel content</subject><subject>iPP</subject><subject>Physical properties</subject><subject>Polymer industry, paints, wood</subject><subject>Properties and testing</subject><subject>Radiation influence</subject><subject>Technology of polymers</subject><subject>Uniaxial orientation</subject><subject>WAXD</subject><issn>0141-3910</issn><issn>1873-2321</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2005</creationdate><recordtype>article</recordtype><recordid>eNqNkE1r3DAQhkVpINsk_0GX9GZXH17bOvRQljYtBJpDexaz0tjWYktbSRvifx8tGyj01LnMDLzvfDyE3HNWc8bbT4f6GOZ1sThGsCnDvhaMNTXraib4O7LhfScrIQV_TzaMN7ySirNr8iGlAyvRbPmGxF1ci3WenXd5pWYCP2Ki4C1dcM7Oj3SPEzy7EGkYaJ6QnryDF1csKw3Roc9oqXt6ovhyDKnUOdDJjRO1pUtn0wjLArTc6CC74G_J1QBzwru3fEN-f_v6a_e9evz58GP35bEyUjW52hqBrOvUliH0Flmz75nBvt1j1wvLjZCdGkBZYbCViIMcBmzVgEaAZGi4vCEfL3OPMfw5Ycp6ccngPIPHcEpaKM6ZlKoIP1-EJoaUIg76GN0CcdWc6TNpfdD_kNZn0pp1upAu_vu3RZAMzEMEb1z6O6SVSnXbvugeLjosXz87jDqZws-gdRFN1ja4_9z4CuLKoUg</recordid><startdate>20050201</startdate><enddate>20050201</enddate><creator>STOJANOVIC, Z</creator><creator>KACAREVIC-POPOVIC, Z</creator><creator>GALOVIC, S</creator><creator>MILICEVIC, D</creator><creator>SULJOVRUJIC, E</creator><general>Elsevier Ltd</general><general>Elsevier Science</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7SE</scope><scope>7SR</scope><scope>8FD</scope><scope>JG9</scope></search><sort><creationdate>20050201</creationdate><title>Crystallinity changes and melting behavior of the uniaxially oriented iPP exposed to high doses of gamma radiation</title><author>STOJANOVIC, Z ; KACAREVIC-POPOVIC, Z ; GALOVIC, S ; MILICEVIC, D ; SULJOVRUJIC, E</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c394t-5c2e077950ea8de04b80ce86be782d1c2379fa9d2ce63eef3ffe69fec2a30ec13</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2005</creationdate><topic>Applied sciences</topic><topic>DSC</topic><topic>Exact sciences and technology</topic><topic>Gamma irradiation</topic><topic>Gel content</topic><topic>iPP</topic><topic>Physical properties</topic><topic>Polymer industry, paints, wood</topic><topic>Properties and testing</topic><topic>Radiation influence</topic><topic>Technology of polymers</topic><topic>Uniaxial orientation</topic><topic>WAXD</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>STOJANOVIC, Z</creatorcontrib><creatorcontrib>KACAREVIC-POPOVIC, Z</creatorcontrib><creatorcontrib>GALOVIC, S</creatorcontrib><creatorcontrib>MILICEVIC, D</creatorcontrib><creatorcontrib>SULJOVRUJIC, E</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Corrosion Abstracts</collection><collection>Engineered Materials Abstracts</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><jtitle>Polymer degradation and stability</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>STOJANOVIC, Z</au><au>KACAREVIC-POPOVIC, Z</au><au>GALOVIC, S</au><au>MILICEVIC, D</au><au>SULJOVRUJIC, E</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Crystallinity changes and melting behavior of the uniaxially oriented iPP exposed to high doses of gamma radiation</atitle><jtitle>Polymer degradation and stability</jtitle><date>2005-02-01</date><risdate>2005</risdate><volume>87</volume><issue>2</issue><spage>279</spage><epage>286</epage><pages>279-286</pages><issn>0141-3910</issn><eissn>1873-2321</eissn><coden>PDSTDW</coden><abstract>Samples of isotactic polypropylene (iPP) oriented via solid-state stretching at elevated temperature (draw ratios of 1, 3, 5, 7.5, 10, 12.5 and 15) were analyzed. Gel content measurements, wide-angle X-ray diffraction (WAXD) and differential scanning calorimetry (DSC) were used to study the effects of high absorbed doses of gamma irradiation, up to 700
kGy. Conclusions derived according to the different methods are compared. The results indicate that the changes in the structure of pristine iPP due to orientation also significantly affect the radiation induced changes in crystallinity, melting behavior and gel production. The role of highly strained tie molecules in radiation-induced increase in crystallinity at doses lower than 250
kGy, for oriented iPP is discussed in terms of the scission and strain-energy relief process on the crystals followed by the growth of new, thin-crystal, lamellae. At higher doses (300, 500 and 700
kGy) radiation-induced decrease in crystallinity is explained in terms of the effect of crosslinking. Orientation induced supermolecular structural changes are related to the decrease in the gel production with draw ratio.</abstract><cop>Oxford</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.polymdegradstab.2004.07.021</doi><tpages>8</tpages></addata></record> |
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subjects | Applied sciences DSC Exact sciences and technology Gamma irradiation Gel content iPP Physical properties Polymer industry, paints, wood Properties and testing Radiation influence Technology of polymers Uniaxial orientation WAXD |
title | Crystallinity changes and melting behavior of the uniaxially oriented iPP exposed to high doses of gamma radiation |
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