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The PNIPA gel without elongational stress showed the behavior close to the second order phase transition. The character of the first order transition became clear under tension, and the transition temperature increased with increasing applied stress. Similar behavior was observed for the NIPA-SA copolymer gel, but the copolymer gel showed the first order transition in the whole stress range investigated. The thermodynamical linear region, where the transition temperature varies linearly with applied stress, was narrower than the mechanical linear region determined by the stress–strain relation of the gels. The change in the transition behavior by the application of the mechanical stress originated chiefly from the volume change in the gels by the applied mechanical stress. It was found that the curve of the transition temperature against applied stress corresponds to the phase boundary between the swollen and collapsed phases for the gels. On the basis of the experimental data, a phenomenological model describing the volume phase transition of the polymer gels is proposed in the frame of the Landau-type free energy expression.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1070282810491707008","@type":"Researcher","personIdentifier":[{"@type":"NRID","@value":"9000024898052"}],"foaf:name":[{"@language":"en","@value":"Takahashi, K"}]},{"@id":"https://cir.nii.ac.jp/crid/1070282810491707009","@type":"Researcher","personIdentifier":[{"@type":"NRID","@value":"9000024898054"}],"foaf:name":[{"@language":"en","@value":"Masuda, T"}]},{"@id":"https://cir.nii.ac.jp/crid/1030003658416196353","@type":"Researcher","personIdentifier":[{"@type":"KAKEN_RESEARCHERS","@value":"50201603"},{"@type":"NRID","@value":"1000050201603"},{"@type":"CINII_AUTHOR_ID","@value":"DA13634090"},{"@type":"URI","@value":"https://ci.nii.ac.jp/author/DA13634090#entity"},{"@type":"URI","@value":"https://viaf.org/viaf/NII%7CDA13634090"},{"@type":"NRID","@value":"9000024872366"},{"@type":"NRID","@value":"9000312726683"},{"@type":"NRID","@value":"9000402585635"},{"@type":"NRID","@value":"9000282412616"},{"@type":"NRID","@value":"9000317564311"},{"@type":"NRID","@value":"9000288835472"},{"@type":"NRID","@value":"9000283203228"},{"@type":"NRID","@value":"9000318614499"},{"@type":"NRID","@value":"9000000926170"},{"@type":"NRID","@value":"9000317564299"},{"@type":"NRID","@value":"9000283558172"},{"@type":"NRID","@value":"9000023253702"},{"@type":"NRID","@value":"9000254932649"},{"@type":"NRID","@value":"9000388490852"},{"@type":"NRID","@value":"9000024892290"},{"@type":"NRID","@value":"9000020341096"},{"@type":"NRID","@value":"9000257751354"},{"@type":"NRID","@value":"9000257750956"},{"@type":"NRID","@value":"9000258660720"},{"@type":"NRID","@value":"9000258661089"},{"@type":"NRID","@value":"9000364783059"},{"@type":"NRID","@value":"9000346961743"},{"@type":"NRID","@value":"9000401862607"},{"@type":"NRID","@value":"9000257966928"},{"@type":"NRID","@value":"9000019053576"},{"@type":"NRID","@value":"9000254138526"},{"@type":"NRID","@value":"9000258442342"},{"@type":"NRID","@value":"9000241498821"},{"@type":"NRID","@value":"9000312726676"},{"@type":"NRID","@value":"9000401950980"},{"@type":"NRID","@value":"9000399496093"},{"@type":"NRID","@value":"9000258394589"},{"@type":"NRID","@value":"9000243768801"},{"@type":"NRID","@value":"9000024898049"},{"@type":"NRID","@value":"9000019943146"},{"@type":"NRID","@value":"9000283149604"},{"@type":"NRID","@value":"9000266907838"},{"@type":"NRID","@value":"9000257752007"},{"@type":"NRID","@value":"9000289265845"},{"@type":"NRID","@value":"9000356681940"},{"@type":"NRID","@value":"9000312726661"},{"@type":"NRID","@value":"9000399411914"},{"@type":"NRID","@value":"9000003642225"},{"@type":"NRID","@value":"9000311497763"},{"@type":"NRID","@value":"9000019943140"},{"@type":"NRID","@value":"9000404529703"},{"@type":"NRID","@value":"9000258660885"},{"@type":"NRID","@value":"9000325460478"},{"@type":"NRID","@value":"9000023105514"},{"@type":"NRID","@value":"9000312259288"},{"@type":"NRID","@value":"9000345317679"},{"@type":"NRID","@value":"9000258660619"},{"@type":"NRID","@value":"9000402211305"},{"@type":"RESEARCHMAP","@value":"https://researchmap.jp/read0012373"}],"foaf:name":[{"@language":"en","@value":"Takigawa, T"}]},{"@id":"https://cir.nii.ac.jp/crid/1070282810491707011","@type":"Researcher","personIdentifier":[{"@type":"NRID","@value":"9000024898051"}],"foaf:name":[{"@language":"en","@value":"Araki, H"}]}],"contributor":[{"@id":"https://cir.nii.ac.jp/crid/1892555066033543040","@type":"Researcher","foaf:name":[{"@value":"50201603"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"00219606"},{"@type":"EISSN","@value":"10897690"}],"prism:publicationName":[{"@language":"en","@value":"JOURNAL OF CHEMICAL PHYSICS"}],"dc:publisher":[{"@value":"AMER INST PHYSICS"}],"prism:publicationDate":"2000-11-01","prism:volume":"113","prism:number":"17","prism:startingPage":"7640","prism:endingPage":"7645"},"reviewed":"false","dcterms:accessRights":"http://purl.org/coar/access_right/c_abf2","dc:rights":["Copyright 2000 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics."],"url":[{"@id":"https://pubs.aip.org/aip/jcp/article-pdf/113/17/7640/19037704/7640_1_online.pdf"},{"@id":"http://hdl.handle.net/2433/39728"}],"relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1360004230218902400","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Poly(<i>N</i>‐isopropylacrylamide) Prepared by Free‐Radical Polymerization in Aqueous Solutions and in Nanocomposite Hydrogels"}]},{"@id":"https://cir.nii.ac.jp/crid/1360004232253967488","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Thermosensitive hybrid hydrogels with silica nanoparticle-cross-linked polymer networks"}]},{"@id":"https://cir.nii.ac.jp/crid/1360848655292755328","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Soft Nanohybrid Materials Consisting of Polymer–Clay Networks"}]},{"@id":"https://cir.nii.ac.jp/crid/1360848656154738688","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Stimuli-responsive nanocomposite gels"}]},{"@id":"https://cir.nii.ac.jp/crid/1390001205095038976","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Studies on Mechanical Properties of Polymer Network Systems"},{"@value":"高分子網目系の力学物性に関する研究"}]},{"@id":"https://cir.nii.ac.jp/crid/1390001206289187840","@type":"Article","relationType":["isReferencedBy","isCitedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Volume Phase Transition of a Poly(N-isopropylacrylamide) Gel under Tension. 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