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Rapid Commun."],"published-print":{"date-parts":[[2026,5]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>Deformation of glassy polymers induces plastic flow as a result of mechanical instability, ultimately leading to cavitation and fracture of the liquid. Thus, understanding the origin of such mechanical instability is crucial. Here, we demonstrate that strain deformation of polymeric glass is accompanied by marked shear\u2010thinning behavior and leads to enhanced density fluctuations. These results are consistent with Furukawa and Tanaka's theory, which predicts that strain induces the self\u2010amplification of the density fluctuations. Thus, we conclude that the enhancement results from the coupling between the velocity field and density fluctuations, stemming from the Furukawa and Tanaka theory, glassy polymer, small\u2010angle X\u2010ray scatteringstrong density dependence of viscosity.<\/jats:p>","DOI":"10.1002\/marc.202500696","type":"journal-article","created":{"date-parts":[[2025,11,29]],"date-time":"2025-11-29T05:45:43Z","timestamp":1764395143000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Strain\u2010Induced Density Fluctuations in Glassy Polymers"],"prefix":"10.1002","volume":"47","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6803-048X","authenticated-orcid":false,"given":"Mikihito","family":"Takenaka","sequence":"first","affiliation":[{"name":"Institute For Chemical Research Kyoto University  Uji Japan"},{"name":"Structural Materials Science Laboratory SPring\u20108 Center RIKEN Harima Institute Research  Sayo\u2010gun Hyogo Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shin'ya","family":"Yoshioka","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering Osaka Electro\u2010Communication University  Neyagawa\u2010shi Osaka Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hirofumi","family":"Shimizu","sequence":"additional","affiliation":[{"name":"Department of Polymer Chemistry Graduate School of Engineering Kyoto University  Kyoto Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shotaro","family":"Nishitsuji","sequence":"additional","affiliation":[{"name":"Department of Organic Materials Science Graduate School of Organic Materials Science Yamagata University  Yonezawa Yamagata Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sumiaki","family":"Fujii","sequence":"additional","affiliation":[{"name":"Department of Polymer Chemistry Graduate School of Engineering Kyoto University  Kyoto Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ryuta","family":"Izumi","sequence":"additional","affiliation":[{"name":"Department of Polymer Chemistry Graduate School of Engineering Kyoto University  Kyoto Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shuhei","family":"Fujita","sequence":"additional","affiliation":[{"name":"Institute For Chemical Research Kyoto University  Uji Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tadashi","family":"Inoue","sequence":"additional","affiliation":[{"name":"Department of Macromolecular Science Graduate School of Science Osaka University  Toyonaka Osaka Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Akira","family":"Furukawa","sequence":"additional","affiliation":[{"name":"Department of Fundamental Engineering Institute of Industrial Science University of Tokyo  Meguro\u2010ku Tokyo Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,11,28]]},"reference":[{"key":"e_1_2_9_2_1","volume-title":"Viscoelastic Properties of Polymers","author":"Ferry J. 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