Cold-Drawn Material As Model Material for the Environmental Stress Cracking (ESC) Phenomenon in Polyethylene. A Raman Spectroscopy Study of Molecular Stress Induced by Macroscopic Strain in Drawn Polyethylenes and Their Relation to Environmental Stress Cracking
Raman spectroscopy was used to study strain-induced molecular stress in cold-drawn polyethylenes, which were being used as a model system for fibrils present in the crazes formed during environmental stress crack resistance (ESCR) tests. The molecular stress was measured at 240 K in order to minimiz...
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| Veröffentlicht in: | Macromolecules 1998-08, Vol.31 (17), p.5845-5852 |
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| container_title | Macromolecules |
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| creator | Lagarón, José M Dixon, N. Michael Gerrard, Don L Reed, Warren Kip, Bert J |
| description | Raman spectroscopy was used to study strain-induced molecular stress in cold-drawn polyethylenes, which were being used as a model system for fibrils present in the crazes formed during environmental stress crack resistance (ESCR) tests. The molecular stress was measured at 240 K in order to minimize relaxation phenomena. Molecular stress was related to macroscopic strain and, by correcting for differences in E-moduli, to true stress. In this paper, the measured molecular stress is related to ESCR values and sample characteristics. It was observed that good ESCR materials showed a lower molecular stress than worse ESCR materials at the same macroscopic strain level. It was also observed that the molecular weight has a major effect on the observed molecular stress per macroscopic strain (molecular stress per macroscopic strain decreases with increasing M w), whereas the effect of chain branching is smaller (molecular stress per macroscopic strain decreases with chain branching). |
| doi_str_mv | 10.1021/ma9717606 |
| format | Article |
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A Raman Spectroscopy Study of Molecular Stress Induced by Macroscopic Strain in Drawn Polyethylenes and Their Relation to Environmental Stress Cracking</title><source>ACS Publications</source><creator>Lagarón, José M ; Dixon, N. Michael ; Gerrard, Don L ; Reed, Warren ; Kip, Bert J</creator><creatorcontrib>Lagarón, José M ; Dixon, N. Michael ; Gerrard, Don L ; Reed, Warren ; Kip, Bert J</creatorcontrib><description>Raman spectroscopy was used to study strain-induced molecular stress in cold-drawn polyethylenes, which were being used as a model system for fibrils present in the crazes formed during environmental stress crack resistance (ESCR) tests. The molecular stress was measured at 240 K in order to minimize relaxation phenomena. Molecular stress was related to macroscopic strain and, by correcting for differences in E-moduli, to true stress. In this paper, the measured molecular stress is related to ESCR values and sample characteristics. It was observed that good ESCR materials showed a lower molecular stress than worse ESCR materials at the same macroscopic strain level. 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In this paper, the measured molecular stress is related to ESCR values and sample characteristics. It was observed that good ESCR materials showed a lower molecular stress than worse ESCR materials at the same macroscopic strain level. 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Michael</creatorcontrib><creatorcontrib>Gerrard, Don L</creatorcontrib><creatorcontrib>Reed, Warren</creatorcontrib><creatorcontrib>Kip, Bert J</creatorcontrib><collection>Istex</collection><collection>Pascal-Francis</collection><collection>CrossRef</collection><jtitle>Macromolecules</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Lagarón, José M</au><au>Dixon, N. Michael</au><au>Gerrard, Don L</au><au>Reed, Warren</au><au>Kip, Bert J</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Cold-Drawn Material As Model Material for the Environmental Stress Cracking (ESC) Phenomenon in Polyethylene. A Raman Spectroscopy Study of Molecular Stress Induced by Macroscopic Strain in Drawn Polyethylenes and Their Relation to Environmental Stress Cracking</atitle><jtitle>Macromolecules</jtitle><addtitle>Macromolecules</addtitle><date>1998-08-25</date><risdate>1998</risdate><volume>31</volume><issue>17</issue><spage>5845</spage><epage>5852</epage><pages>5845-5852</pages><issn>0024-9297</issn><eissn>1520-5835</eissn><coden>MAMOBX</coden><abstract>Raman spectroscopy was used to study strain-induced molecular stress in cold-drawn polyethylenes, which were being used as a model system for fibrils present in the crazes formed during environmental stress crack resistance (ESCR) tests. The molecular stress was measured at 240 K in order to minimize relaxation phenomena. Molecular stress was related to macroscopic strain and, by correcting for differences in E-moduli, to true stress. In this paper, the measured molecular stress is related to ESCR values and sample characteristics. It was observed that good ESCR materials showed a lower molecular stress than worse ESCR materials at the same macroscopic strain level. It was also observed that the molecular weight has a major effect on the observed molecular stress per macroscopic strain (molecular stress per macroscopic strain decreases with increasing M w), whereas the effect of chain branching is smaller (molecular stress per macroscopic strain decreases with chain branching).</abstract><cop>Washington, DC</cop><pub>American Chemical Society</pub><doi>10.1021/ma9717606</doi><tpages>8</tpages></addata></record> |
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| language | eng |
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| source | ACS Publications |
| subjects | Applied sciences Exact sciences and technology Mechanical properties Organic polymers Physicochemistry of polymers Properties and characterization |
| title | Cold-Drawn Material As Model Material for the Environmental Stress Cracking (ESC) Phenomenon in Polyethylene. A Raman Spectroscopy Study of Molecular Stress Induced by Macroscopic Strain in Drawn Polyethylenes and Their Relation to Environmental Stress Cracking |
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