Morphology and micromechanical deformation behavior of styrene/butadiene-block copolymers. I. Toughening mechanisms in asymmetric star block copolymers
Lamellae‐forming styrene/butadiene star block copolymers are studied to investigate the influence of morphology on micromechanical deformation mechanisms and mechanical properties by using transmission electron microscopy and tensile testing. A large homogeneous plastic deformation of polystyrene (P...
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| Veröffentlicht in: | Journal of applied polymer science 2002-07, Vol.85 (4), p.683-700 |
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| creator | Michler, G. H. Adhikari, R. Lebek, W. Goerlitz, S. Weidisch, R. Knoll, K. |
| description | Lamellae‐forming styrene/butadiene star block copolymers are studied to investigate the influence of morphology on micromechanical deformation mechanisms and mechanical properties by using transmission electron microscopy and tensile testing. A large homogeneous plastic deformation of polystyrene (PS) lamellae is found in styrene/butadiene star block copolymers on the basis of the new mechanism called thin‐layer yielding. This mechanism depends strongly on the thickness of the PS lamellae. At a critical thickness of PS lamellae of about 20 nm, a transition from thin‐layer yielding mechanism to a crazelike deformation was observed. These new deformation zones are similar to crazes with respect to their propagation perpendicular to direction of external stress and similar to shear bands with respect to an internal shear deformation component of the lamellae in the deformation zones. As a result of our investigations, the mechanical properties of star block copolymers can be understood in correlation with morphology and micromechanical deformation mechanisms. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 85: 683–700, 2002 |
| doi_str_mv | 10.1002/app.10540 |
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I. Toughening mechanisms in asymmetric star block copolymers</title><source>Access via Wiley Online Library</source><creator>Michler, G. H. ; Adhikari, R. ; Lebek, W. ; Goerlitz, S. ; Weidisch, R. ; Knoll, K.</creator><creatorcontrib>Michler, G. H. ; Adhikari, R. ; Lebek, W. ; Goerlitz, S. ; Weidisch, R. ; Knoll, K.</creatorcontrib><description>Lamellae‐forming styrene/butadiene star block copolymers are studied to investigate the influence of morphology on micromechanical deformation mechanisms and mechanical properties by using transmission electron microscopy and tensile testing. A large homogeneous plastic deformation of polystyrene (PS) lamellae is found in styrene/butadiene star block copolymers on the basis of the new mechanism called thin‐layer yielding. This mechanism depends strongly on the thickness of the PS lamellae. At a critical thickness of PS lamellae of about 20 nm, a transition from thin‐layer yielding mechanism to a crazelike deformation was observed. These new deformation zones are similar to crazes with respect to their propagation perpendicular to direction of external stress and similar to shear bands with respect to an internal shear deformation component of the lamellae in the deformation zones. As a result of our investigations, the mechanical properties of star block copolymers can be understood in correlation with morphology and micromechanical deformation mechanisms. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 85: 683–700, 2002</description><identifier>ISSN: 0021-8995</identifier><identifier>EISSN: 1097-4628</identifier><identifier>DOI: 10.1002/app.10540</identifier><identifier>CODEN: JAPNAB</identifier><language>eng</language><publisher>New York: Wiley Subscription Services, Inc., A Wiley Company</publisher><subject>Applied sciences ; electron microscopy ; Exact sciences and technology ; Mechanical properties ; micromechanical mechanisms ; morphology ; Organic polymers ; Physicochemistry of polymers ; Properties and characterization ; SB star block copolymers ; thin-layer yielding ; toughening mechanism</subject><ispartof>Journal of applied polymer science, 2002-07, Vol.85 (4), p.683-700</ispartof><rights>Copyright © 2002 Wiley Periodicals, Inc.</rights><rights>2002 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c4320-842d6cfc808b0f6b0c85e89e3ab2377b12acbfa532b97a649dc0cb31b4e0baf3</citedby><cites>FETCH-LOGICAL-c4320-842d6cfc808b0f6b0c85e89e3ab2377b12acbfa532b97a649dc0cb31b4e0baf3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1002%2Fapp.10540$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1002%2Fapp.10540$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,780,784,1417,27924,27925,45574,45575</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=13685178$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Michler, G. H.</creatorcontrib><creatorcontrib>Adhikari, R.</creatorcontrib><creatorcontrib>Lebek, W.</creatorcontrib><creatorcontrib>Goerlitz, S.</creatorcontrib><creatorcontrib>Weidisch, R.</creatorcontrib><creatorcontrib>Knoll, K.</creatorcontrib><title>Morphology and micromechanical deformation behavior of styrene/butadiene-block copolymers. I. Toughening mechanisms in asymmetric star block copolymers</title><title>Journal of applied polymer science</title><addtitle>J. Appl. Polym. Sci</addtitle><description>Lamellae‐forming styrene/butadiene star block copolymers are studied to investigate the influence of morphology on micromechanical deformation mechanisms and mechanical properties by using transmission electron microscopy and tensile testing. A large homogeneous plastic deformation of polystyrene (PS) lamellae is found in styrene/butadiene star block copolymers on the basis of the new mechanism called thin‐layer yielding. This mechanism depends strongly on the thickness of the PS lamellae. At a critical thickness of PS lamellae of about 20 nm, a transition from thin‐layer yielding mechanism to a crazelike deformation was observed. These new deformation zones are similar to crazes with respect to their propagation perpendicular to direction of external stress and similar to shear bands with respect to an internal shear deformation component of the lamellae in the deformation zones. As a result of our investigations, the mechanical properties of star block copolymers can be understood in correlation with morphology and micromechanical deformation mechanisms. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 85: 683–700, 2002</description><subject>Applied sciences</subject><subject>electron microscopy</subject><subject>Exact sciences and technology</subject><subject>Mechanical properties</subject><subject>micromechanical mechanisms</subject><subject>morphology</subject><subject>Organic polymers</subject><subject>Physicochemistry of polymers</subject><subject>Properties and characterization</subject><subject>SB star block copolymers</subject><subject>thin-layer yielding</subject><subject>toughening mechanism</subject><issn>0021-8995</issn><issn>1097-4628</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2002</creationdate><recordtype>article</recordtype><recordid>eNp1kM2O0zAURiMEEmVgwRt4AxKLtP5JYmc5GsEwaIAuKiGxsa4duzUT28FOgTwJr4uhBSQkVr6Sz3cWp6qeErwmGNMNTFM52gbfq1YE97xuOiruV6vyR2rR9-3D6lHOnzAmpMXdqvr-NqbpEMe4XxCEAXmnU_RGHyA4DSMajI3Jw-xiQMoc4IuLCUWL8rwkE8xGHWcYXLlqNUZ9h3Sc4rh4k_Ia3azRLh73BxNc2KOzNPuMXECQF-_NnJwuKkjo3_Xj6oGFMZsn5_ei2r16ubt6Xd--v765urytdcMorkVDh05bLbBQ2HYKa9Ea0RsGijLOFaGglYWWUdVz6Jp-0FgrRlRjsALLLqrnJ-2U4uejybP0LmszjhBMPGZJOSU9F00BX5zAkifnZKyckvOQFkmw_FlelvLyV_nCPjtLIZeGNkHQLv8dsE60hIvCbU7cVzea5f9Cebnd_jbXp4XLs_n2ZwHpTnac8VZ-eHct2cfuDRc9l1v2AwxNpfw</recordid><startdate>20020725</startdate><enddate>20020725</enddate><creator>Michler, G. 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H.</creatorcontrib><creatorcontrib>Adhikari, R.</creatorcontrib><creatorcontrib>Lebek, W.</creatorcontrib><creatorcontrib>Goerlitz, S.</creatorcontrib><creatorcontrib>Weidisch, R.</creatorcontrib><creatorcontrib>Knoll, K.</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>Journal of applied polymer science</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Michler, G. H.</au><au>Adhikari, R.</au><au>Lebek, W.</au><au>Goerlitz, S.</au><au>Weidisch, R.</au><au>Knoll, K.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Morphology and micromechanical deformation behavior of styrene/butadiene-block copolymers. I. Toughening mechanisms in asymmetric star block copolymers</atitle><jtitle>Journal of applied polymer science</jtitle><addtitle>J. Appl. Polym. Sci</addtitle><date>2002-07-25</date><risdate>2002</risdate><volume>85</volume><issue>4</issue><spage>683</spage><epage>700</epage><pages>683-700</pages><issn>0021-8995</issn><eissn>1097-4628</eissn><coden>JAPNAB</coden><abstract>Lamellae‐forming styrene/butadiene star block copolymers are studied to investigate the influence of morphology on micromechanical deformation mechanisms and mechanical properties by using transmission electron microscopy and tensile testing. A large homogeneous plastic deformation of polystyrene (PS) lamellae is found in styrene/butadiene star block copolymers on the basis of the new mechanism called thin‐layer yielding. This mechanism depends strongly on the thickness of the PS lamellae. 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| subjects | Applied sciences electron microscopy Exact sciences and technology Mechanical properties micromechanical mechanisms morphology Organic polymers Physicochemistry of polymers Properties and characterization SB star block copolymers thin-layer yielding toughening mechanism |
| title | Morphology and micromechanical deformation behavior of styrene/butadiene-block copolymers. I. Toughening mechanisms in asymmetric star block copolymers |
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