Image analysis of shear-induced textures in liquid-crystalline polymers
Textures of several liquid-crystalline solutions of poly(benzylglutamate) and a solution of hydroxypropylcellulose were videorecorded during and after shear and the images were Fourier transformed. We find for all the solutions that bands perpendicular to the flow direction form after cessation of p...
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| Veröffentlicht in: | Liquid crystals 1992-03, Vol.11 (3), p.341-364 |
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| container_title | Liquid crystals |
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| creator | Gleeson, J. T. Larson, R. G. Mead, D. W. Kiss, G. Cladis, P. E. |
| description | Textures of several liquid-crystalline solutions of poly(benzylglutamate) and a solution of hydroxypropylcellulose were videorecorded during and after shear and the images were Fourier transformed. We find for all the solutions that bands perpendicular to the flow direction form after cessation of prolonged shearing if the Deborah number De exceeds a critical value De
c
≈0·1. Here De = τ
, where
is the shear rate and τ is the characteristic molecular relaxation time. The bands are characterized by an initially broad spectrum of wavelengths; for the poly(benzylglutamate) solutions this spectrum narrows and shifts towards longer wavelengths as time progresses after cessation of shear, leading to an increase in the characteristic band spacing b(t) with time t. The dependences of the band spacing on the shear rate
and on the solution viscosity n in poly(benzylglutamate) are very weak, but the time to form bands after shearing ceases is roughly inversely proportional to
0
. Our results suggest that both molecular elasticity and texture elasticity influence band formation, and that the texture elasticity is not described by small gradient (Frank) theory. |
| doi_str_mv | 10.1080/02678299208028994 |
| format | Article |
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c
≈0·1. Here De = τ
, where
is the shear rate and τ is the characteristic molecular relaxation time. The bands are characterized by an initially broad spectrum of wavelengths; for the poly(benzylglutamate) solutions this spectrum narrows and shifts towards longer wavelengths as time progresses after cessation of shear, leading to an increase in the characteristic band spacing b(t) with time t. The dependences of the band spacing on the shear rate
and on the solution viscosity n in poly(benzylglutamate) are very weak, but the time to form bands after shearing ceases is roughly inversely proportional to
0
. Our results suggest that both molecular elasticity and texture elasticity influence band formation, and that the texture elasticity is not described by small gradient (Frank) theory.</description><identifier>ISSN: 0267-8292</identifier><identifier>EISSN: 1366-5855</identifier><identifier>DOI: 10.1080/02678299208028994</identifier><language>eng</language><publisher>ABINGDON: Taylor & Francis Group</publisher><subject>Chemistry ; Chemistry, Multidisciplinary ; Crystallography ; Materials Science ; Materials Science, Multidisciplinary ; Physical Sciences ; Science & Technology ; Technology</subject><ispartof>Liquid crystals, 1992-03, Vol.11 (3), p.341-364</ispartof><rights>Copyright Taylor & Francis Group, LLC 1992</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>true</woscitedreferencessubscribed><woscitedreferencescount>70</woscitedreferencescount><woscitedreferencesoriginalsourcerecordid>wosA1992HE77700004</woscitedreferencesoriginalsourcerecordid><citedby>FETCH-LOGICAL-c393t-efff6002d44e751e2c64e686e6e7dad0c7c9dc070a7aa616102702c0df6955293</citedby><cites>FETCH-LOGICAL-c393t-efff6002d44e751e2c64e686e6e7dad0c7c9dc070a7aa616102702c0df6955293</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://www.tandfonline.com/doi/pdf/10.1080/02678299208028994$$EPDF$$P50$$Ginformaworld$$H</linktopdf><linktohtml>$$Uhttps://www.tandfonline.com/doi/full/10.1080/02678299208028994$$EHTML$$P50$$Ginformaworld$$H</linktohtml><link.rule.ids>315,781,785,27197,27929,27930,59652,60441</link.rule.ids></links><search><creatorcontrib>Gleeson, J. T.</creatorcontrib><creatorcontrib>Larson, R. G.</creatorcontrib><creatorcontrib>Mead, D. W.</creatorcontrib><creatorcontrib>Kiss, G.</creatorcontrib><creatorcontrib>Cladis, P. E.</creatorcontrib><title>Image analysis of shear-induced textures in liquid-crystalline polymers</title><title>Liquid crystals</title><addtitle>LIQ CRYST</addtitle><description>Textures of several liquid-crystalline solutions of poly(benzylglutamate) and a solution of hydroxypropylcellulose were videorecorded during and after shear and the images were Fourier transformed. We find for all the solutions that bands perpendicular to the flow direction form after cessation of prolonged shearing if the Deborah number De exceeds a critical value De
c
≈0·1. Here De = τ
, where
is the shear rate and τ is the characteristic molecular relaxation time. The bands are characterized by an initially broad spectrum of wavelengths; for the poly(benzylglutamate) solutions this spectrum narrows and shifts towards longer wavelengths as time progresses after cessation of shear, leading to an increase in the characteristic band spacing b(t) with time t. The dependences of the band spacing on the shear rate
and on the solution viscosity n in poly(benzylglutamate) are very weak, but the time to form bands after shearing ceases is roughly inversely proportional to
0
. Our results suggest that both molecular elasticity and texture elasticity influence band formation, and that the texture elasticity is not described by small gradient (Frank) theory.</description><subject>Chemistry</subject><subject>Chemistry, Multidisciplinary</subject><subject>Crystallography</subject><subject>Materials Science</subject><subject>Materials Science, Multidisciplinary</subject><subject>Physical Sciences</subject><subject>Science & Technology</subject><subject>Technology</subject><issn>0267-8292</issn><issn>1366-5855</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1992</creationdate><recordtype>article</recordtype><sourceid>EZCTM</sourceid><recordid>eNqNkMFK7TAQhoNcwXPVB3DXlRvpdZK2SQpu5OBVQXCj6xKTiUbS5JikaN_eyhE3Irgafub7huEn5IjCPwoSToFxIVnfsyUw2fftDlnRhvO6k133h6w-9vUCsD3yN-dnABBSihW5vB7VI1YqKD9nl6toq_yEKtUumEmjqQq-lSlhrlyovHuZnKl1mnNR3ruA1Sb6ecSUD8iuVT7j4efcJ_f_L-7WV_XN7eX1-vym1k3flBqttRyAmbZF0VFkmrfIJUeOwigDWujeaBCghFKccgpMANNgLO-7jvXNPjne3t2k-DJhLsPoskbvVcA45YF1glIhmwWkW1CnmHNCO2ySG1WaBwrDR2XDt8oWR26dV3yINmuHQeOXd04X9upCCLG0B-3aFVVcDOs4hbKoJ79XF_psS7tgYxrVa0zeDEXNPiabVNAuD83Pf74DD2GTGQ</recordid><startdate>19920301</startdate><enddate>19920301</enddate><creator>Gleeson, J. T.</creator><creator>Larson, R. G.</creator><creator>Mead, D. W.</creator><creator>Kiss, G.</creator><creator>Cladis, P. E.</creator><general>Taylor & Francis Group</general><general>Taylor & Francis</general><scope>BLEPL</scope><scope>DTL</scope><scope>EZCTM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>8FD</scope><scope>JG9</scope></search><sort><creationdate>19920301</creationdate><title>Image analysis of shear-induced textures in liquid-crystalline polymers</title><author>Gleeson, J. T. ; Larson, R. G. ; Mead, D. W. ; Kiss, G. ; Cladis, P. E.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c393t-efff6002d44e751e2c64e686e6e7dad0c7c9dc070a7aa616102702c0df6955293</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1992</creationdate><topic>Chemistry</topic><topic>Chemistry, Multidisciplinary</topic><topic>Crystallography</topic><topic>Materials Science</topic><topic>Materials Science, Multidisciplinary</topic><topic>Physical Sciences</topic><topic>Science & Technology</topic><topic>Technology</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Gleeson, J. T.</creatorcontrib><creatorcontrib>Larson, R. G.</creatorcontrib><creatorcontrib>Mead, D. W.</creatorcontrib><creatorcontrib>Kiss, G.</creatorcontrib><creatorcontrib>Cladis, P. E.</creatorcontrib><collection>Web of Science Core Collection</collection><collection>Science Citation Index Expanded</collection><collection>Web of Science - Science Citation Index Expanded - 1992</collection><collection>CrossRef</collection><collection>Engineered Materials Abstracts</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><jtitle>Liquid crystals</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Gleeson, J. T.</au><au>Larson, R. G.</au><au>Mead, D. W.</au><au>Kiss, G.</au><au>Cladis, P. E.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Image analysis of shear-induced textures in liquid-crystalline polymers</atitle><jtitle>Liquid crystals</jtitle><stitle>LIQ CRYST</stitle><date>1992-03-01</date><risdate>1992</risdate><volume>11</volume><issue>3</issue><spage>341</spage><epage>364</epage><pages>341-364</pages><issn>0267-8292</issn><eissn>1366-5855</eissn><abstract>Textures of several liquid-crystalline solutions of poly(benzylglutamate) and a solution of hydroxypropylcellulose were videorecorded during and after shear and the images were Fourier transformed. We find for all the solutions that bands perpendicular to the flow direction form after cessation of prolonged shearing if the Deborah number De exceeds a critical value De
c
≈0·1. Here De = τ
, where
is the shear rate and τ is the characteristic molecular relaxation time. The bands are characterized by an initially broad spectrum of wavelengths; for the poly(benzylglutamate) solutions this spectrum narrows and shifts towards longer wavelengths as time progresses after cessation of shear, leading to an increase in the characteristic band spacing b(t) with time t. The dependences of the band spacing on the shear rate
and on the solution viscosity n in poly(benzylglutamate) are very weak, but the time to form bands after shearing ceases is roughly inversely proportional to
0
. Our results suggest that both molecular elasticity and texture elasticity influence band formation, and that the texture elasticity is not described by small gradient (Frank) theory.</abstract><cop>ABINGDON</cop><pub>Taylor & Francis Group</pub><doi>10.1080/02678299208028994</doi><tpages>24</tpages></addata></record> |
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| source | Web of Science - Science Citation Index Expanded - 1992<img src="https://exlibris-pub.s3.amazonaws.com/fromwos-v2.jpg" />; Access via Taylor & Francis |
| subjects | Chemistry Chemistry, Multidisciplinary Crystallography Materials Science Materials Science, Multidisciplinary Physical Sciences Science & Technology Technology |
| title | Image analysis of shear-induced textures in liquid-crystalline polymers |
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