Mechanical properties of biaxially strained poly(l‐lactide) tubes: Strain rate and temperature dependence
ABSTRACT Poly(l‐lactide) (PLLA) is a bioabsorbable polymer with high stiffness and strength compared to the other commercially available bioabsorbable polymers. The properties of PLLA can be improved by straining, causing deformation‐mediated molecular orientation. PLLA tubes were biaxially strained...
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| Veröffentlicht in: | Journal of applied polymer science 2017-09, Vol.134 (33), p.n/a |
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| creator | Løvdal, Alexandra Liv Vest Andreasen, Jens W. Mikkelsen, Lars P. Agersted, Karsten Almdal, Kristoffer |
| description | ABSTRACT
Poly(l‐lactide) (PLLA) is a bioabsorbable polymer with high stiffness and strength compared to the other commercially available bioabsorbable polymers. The properties of PLLA can be improved by straining, causing deformation‐mediated molecular orientation. PLLA tubes were biaxially strained above their Tg for improvement of their strength, in a two‐step process (sequential straining). Mechanical properties and crystal morphology were investigated as a function of processing strain rate and temperature. DSC revealed that a low processing strain rate allows molecular chain relaxation in the direction of strain and the crystallization is suppressed. Faster strain rates on the other hand suppress chain relaxation, and results in crystalline tubes. The mechanical properties are influenced by both processing strain rate and temperature. Low strain rates allow chain relaxation resulting in the lowest strength and stiffness, whereas a larger stiffness and strength is achieved by increasing strain rate and temperature. Isotropic mechanical properties are only observed at high processing strain rates. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45192. |
| doi_str_mv | 10.1002/app.45192 |
| format | Article |
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Poly(l‐lactide) (PLLA) is a bioabsorbable polymer with high stiffness and strength compared to the other commercially available bioabsorbable polymers. The properties of PLLA can be improved by straining, causing deformation‐mediated molecular orientation. PLLA tubes were biaxially strained above their Tg for improvement of their strength, in a two‐step process (sequential straining). Mechanical properties and crystal morphology were investigated as a function of processing strain rate and temperature. DSC revealed that a low processing strain rate allows molecular chain relaxation in the direction of strain and the crystallization is suppressed. Faster strain rates on the other hand suppress chain relaxation, and results in crystalline tubes. The mechanical properties are influenced by both processing strain rate and temperature. Low strain rates allow chain relaxation resulting in the lowest strength and stiffness, whereas a larger stiffness and strength is achieved by increasing strain rate and temperature. Isotropic mechanical properties are only observed at high processing strain rates. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45192.</description><identifier>ISSN: 0021-8995</identifier><identifier>EISSN: 1097-4628</identifier><identifier>DOI: 10.1002/app.45192</identifier><language>eng</language><publisher>Hoboken: Wiley Subscription Services, Inc</publisher><subject>Alloys ; biomedical applications ; Crystal morphology ; Crystallization ; differential scanning calorimetry ; Materials science ; Mechanical properties ; Molecular chains ; packaging ; Polymers ; Stiffness ; Strain rate ; Strength ; Temperature dependence ; Tubes</subject><ispartof>Journal of applied polymer science, 2017-09, Vol.134 (33), p.n/a</ispartof><rights>2017 Wiley Periodicals, Inc.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c3322-353dbf5dbf677fdae1b1de52614bf622e16db2c476d5d3be35831ab57ab2da153</citedby><cites>FETCH-LOGICAL-c3322-353dbf5dbf677fdae1b1de52614bf622e16db2c476d5d3be35831ab57ab2da153</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.45192$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1002%2Fapp.45192$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,776,780,1411,27901,27902,45550,45551</link.rule.ids></links><search><creatorcontrib>Løvdal, Alexandra Liv Vest</creatorcontrib><creatorcontrib>Andreasen, Jens W.</creatorcontrib><creatorcontrib>Mikkelsen, Lars P.</creatorcontrib><creatorcontrib>Agersted, Karsten</creatorcontrib><creatorcontrib>Almdal, Kristoffer</creatorcontrib><title>Mechanical properties of biaxially strained poly(l‐lactide) tubes: Strain rate and temperature dependence</title><title>Journal of applied polymer science</title><description>ABSTRACT
Poly(l‐lactide) (PLLA) is a bioabsorbable polymer with high stiffness and strength compared to the other commercially available bioabsorbable polymers. The properties of PLLA can be improved by straining, causing deformation‐mediated molecular orientation. PLLA tubes were biaxially strained above their Tg for improvement of their strength, in a two‐step process (sequential straining). Mechanical properties and crystal morphology were investigated as a function of processing strain rate and temperature. DSC revealed that a low processing strain rate allows molecular chain relaxation in the direction of strain and the crystallization is suppressed. Faster strain rates on the other hand suppress chain relaxation, and results in crystalline tubes. The mechanical properties are influenced by both processing strain rate and temperature. Low strain rates allow chain relaxation resulting in the lowest strength and stiffness, whereas a larger stiffness and strength is achieved by increasing strain rate and temperature. Isotropic mechanical properties are only observed at high processing strain rates. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45192.</description><subject>Alloys</subject><subject>biomedical applications</subject><subject>Crystal morphology</subject><subject>Crystallization</subject><subject>differential scanning calorimetry</subject><subject>Materials science</subject><subject>Mechanical properties</subject><subject>Molecular chains</subject><subject>packaging</subject><subject>Polymers</subject><subject>Stiffness</subject><subject>Strain rate</subject><subject>Strength</subject><subject>Temperature dependence</subject><subject>Tubes</subject><issn>0021-8995</issn><issn>1097-4628</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2017</creationdate><recordtype>article</recordtype><recordid>eNp1kE1OwzAQhS0EEqWw4AaW2NBFiu3E-WFXVfxJRVQC1tE4noiUNAm2I8iOI3BGToJp2LIYjTTzzXuaR8gpZ3POmLiArptHkmdij0w4y5IgikW6TyZ-x4M0y-QhObJ2wxjnksUT8nqPxQs0VQE17UzboXEVWtqWVFXwUUFdD9Q6A1WDmnZtPZzX359fNRSu0jijrldoL-njjqAGHFJoNHW49UrgeoNUY4eNxqbAY3JQQm3x5K9PyfP11dPyNlg93NwtF6ugCEMhglCGWpXSV5wkpQbkimuUIuaRHwmBPNZKFFESa6lDhaFMQw5KJqCEBi7DKTkbdf1Dbz1al2_a3jTeMucZE1GSxiLy1GykCtNaa7DMO1NtwQw5Z_lvlrnPMt9l6dmLkX2vahz-B_PFej1e_ABxcXiC</recordid><startdate>20170905</startdate><enddate>20170905</enddate><creator>Løvdal, Alexandra Liv Vest</creator><creator>Andreasen, Jens W.</creator><creator>Mikkelsen, Lars P.</creator><creator>Agersted, Karsten</creator><creator>Almdal, Kristoffer</creator><general>Wiley Subscription Services, Inc</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>8FD</scope><scope>JG9</scope></search><sort><creationdate>20170905</creationdate><title>Mechanical properties of biaxially strained poly(l‐lactide) tubes: Strain rate and temperature dependence</title><author>Løvdal, Alexandra Liv Vest ; Andreasen, Jens W. ; Mikkelsen, Lars P. ; Agersted, Karsten ; Almdal, Kristoffer</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c3322-353dbf5dbf677fdae1b1de52614bf622e16db2c476d5d3be35831ab57ab2da153</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2017</creationdate><topic>Alloys</topic><topic>biomedical applications</topic><topic>Crystal morphology</topic><topic>Crystallization</topic><topic>differential scanning calorimetry</topic><topic>Materials science</topic><topic>Mechanical properties</topic><topic>Molecular chains</topic><topic>packaging</topic><topic>Polymers</topic><topic>Stiffness</topic><topic>Strain rate</topic><topic>Strength</topic><topic>Temperature dependence</topic><topic>Tubes</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Løvdal, Alexandra Liv Vest</creatorcontrib><creatorcontrib>Andreasen, Jens W.</creatorcontrib><creatorcontrib>Mikkelsen, Lars P.</creatorcontrib><creatorcontrib>Agersted, Karsten</creatorcontrib><creatorcontrib>Almdal, Kristoffer</creatorcontrib><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>Løvdal, Alexandra Liv Vest</au><au>Andreasen, Jens W.</au><au>Mikkelsen, Lars P.</au><au>Agersted, Karsten</au><au>Almdal, Kristoffer</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Mechanical properties of biaxially strained poly(l‐lactide) tubes: Strain rate and temperature dependence</atitle><jtitle>Journal of applied polymer science</jtitle><date>2017-09-05</date><risdate>2017</risdate><volume>134</volume><issue>33</issue><epage>n/a</epage><issn>0021-8995</issn><eissn>1097-4628</eissn><abstract>ABSTRACT
Poly(l‐lactide) (PLLA) is a bioabsorbable polymer with high stiffness and strength compared to the other commercially available bioabsorbable polymers. The properties of PLLA can be improved by straining, causing deformation‐mediated molecular orientation. PLLA tubes were biaxially strained above their Tg for improvement of their strength, in a two‐step process (sequential straining). Mechanical properties and crystal morphology were investigated as a function of processing strain rate and temperature. DSC revealed that a low processing strain rate allows molecular chain relaxation in the direction of strain and the crystallization is suppressed. Faster strain rates on the other hand suppress chain relaxation, and results in crystalline tubes. The mechanical properties are influenced by both processing strain rate and temperature. Low strain rates allow chain relaxation resulting in the lowest strength and stiffness, whereas a larger stiffness and strength is achieved by increasing strain rate and temperature. Isotropic mechanical properties are only observed at high processing strain rates. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45192.</abstract><cop>Hoboken</cop><pub>Wiley Subscription Services, Inc</pub><doi>10.1002/app.45192</doi><tpages>6</tpages><oa>free_for_read</oa></addata></record> |
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| subjects | Alloys biomedical applications Crystal morphology Crystallization differential scanning calorimetry Materials science Mechanical properties Molecular chains packaging Polymers Stiffness Strain rate Strength Temperature dependence Tubes |
| title | Mechanical properties of biaxially strained poly(l‐lactide) tubes: Strain rate and temperature dependence |
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