{"created":"2023-05-15T11:59:13.466412+00:00","id":5551,"links":{},"metadata":{"_buckets":{"deposit":"262d0181-8f67-47af-bb7b-cb0347e80455"},"_deposit":{"created_by":3,"id":"5551","owners":[3],"pid":{"revision_id":0,"type":"depid","value":"5551"},"status":"published"},"_oai":{"id":"oai:kyutech.repo.nii.ac.jp:00005551","sets":["8:9"]},"author_link":["22475","22476","22006","21961","8065"],"item_21_biblio_info_6":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2007-01-14","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"4","bibliographicPageEnd":"559","bibliographicPageStart":"552","bibliographicVolumeNumber":"92","bibliographic_titles":[{"bibliographic_title":"Polymer Degradation and Stability"}]}]},"item_21_description_4":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"To control the depolymerization process of poly (L-lactic acid) into L,L-lactide for feedstock recycling, the racemization of L,L-lactide as a post-depolymerization reaction was investigated. In the absence of a catalyst, the conversion to meso-lactide increased with increase in the heating temperature and time at a higher rate than the conversion into oligomers. The resulting high composition of meso-lactide suggests that the direct racemization of L,L-lactide had occurred in addition to the known racemization mechanism that occurs on the oligomer chains. In the presence of MgO, the oligomerization rapidly proceeded to reach an equilibrium state between monomers and oligomers. The equilibrium among L,L-, meso-, and D,D-lactides was found to be a convergent composition ratio: L,L-:meso-:D,D-lactides = 1:1.22:0.99 (wt/wt/wt) after 120 min at 300 °C. This composition ratio also indicates that, in addition to the known racemization reaction on the oligomer chains, direct racemization among the lactides is also a frequent occurrence.","subitem_description_type":"Abstract"}]},"item_21_description_60":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"subitem_description":"Journal Article","subitem_description_type":"Other"}]},"item_21_link_62":{"attribute_name":"研究者情報","attribute_value_mlt":[{"subitem_link_url":"https://hyokadb02.jimu.kyutech.ac.jp/html/397_ja.html"}]},"item_21_publisher_7":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"Elsevier"}]},"item_21_relation_12":{"attribute_name":"DOI","attribute_value_mlt":[{"subitem_relation_type":"isVersionOf","subitem_relation_type_id":{"subitem_relation_type_id_text":"https://doi.org/10.1016/j.polymdegradstab.2007.01.009","subitem_relation_type_select":"DOI"}}]},"item_21_rights_13":{"attribute_name":"権利","attribute_value_mlt":[{"subitem_rights":"Copyright (c) 2007 Elsevier Ltd. All rights reserved."}]},"item_21_select_59":{"attribute_name":"査読の有無","attribute_value_mlt":[{"subitem_select_item":"yes"}]},"item_21_source_id_8":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"0141-3910","subitem_source_identifier_type":"ISSN"}]},"item_21_text_28":{"attribute_name":"論文ID（連携）","attribute_value_mlt":[{"subitem_text_value":"10037530"}]},"item_21_text_36":{"attribute_name":"著者所属","attribute_value_mlt":[{"subitem_text_value":"Molecular Engineering Institute, Kinki University 11-6 Kayanomori, Iizuka, Fukuoka 820-8555 Japan, Kyushu Institute of Technology 2-4 Hibikino, Wakamatsu-ku, Kitakyushu-shi, Fukuoka, 808-0196, Japan"},{"subitem_text_value":"Kyushu Institute of Technology 2-4 Hibikino, Wakamatsu-ku, Kitakyushu-shi, Fukuoka, 808-0196, Japan"},{"subitem_text_value":"Kyushu Institute of Technology 2-4 Hibikino, Wakamatsu-ku, Kitakyushu-shi, Fukuoka, 808-0196, Japan"},{"subitem_text_value":"Molecular Engineering Institute, Kinki University 11-6 Kayanomori, Iizuka, Fukuoka 820-8555 Japan"},{"subitem_text_value":"Molecular Engineering Institute, Kinki University 11-6 Kayanomori, Iizuka, Fukuoka 820-8555 Japan"}]},"item_21_text_63":{"attribute_name":"連携ID","attribute_value_mlt":[{"subitem_text_value":"6982"}]},"item_21_version_type_58":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_ab4af688f83e57aa","subitem_version_type":"AM"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"Tsukegi,  Takayuki"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Motoyama,  Toru"}],"nameIdentifiers":[{}]},{"creatorAffiliations":[{"affiliationNameIdentifiers":[],"affiliationNames":[{"affiliationName":""}]}],"creatorNames":[{"creatorName":"Shirai, Yoshihito","creatorNameLang":"en"},{"creatorName":"白井, 義人","creatorNameLang":"ja"},{"creatorName":"シライ, ヨシヒト","creatorNameLang":"ja-Kana"}],"familyNames":[{},{},{}],"givenNames":[{},{},{}],"nameIdentifiers":[{},{},{},{}]},{"creatorAffiliations":[{"affiliationNameIdentifiers":[],"affiliationNames":[{"affiliationName":""}]}],"creatorNames":[{"creatorName":"Nishida, Haruo","creatorNameLang":"en"},{"creatorName":"西田, 治男","creatorNameLang":"ja"},{"creatorName":"ニシダ, ハルオ","creatorNameLang":"ja-Kana"}],"familyNames":[{},{},{}],"givenNames":[{},{},{}],"nameIdentifiers":[{},{},{},{}]},{"creatorAffiliations":[{"affiliationNameIdentifiers":[],"affiliationNames":[{"affiliationName":""}]}],"creatorNames":[{"creatorName":"Endo, Takeshi","creatorNameLang":"en"},{"creatorName":"遠藤, 剛","creatorNameLang":"ja"},{"creatorName":"エンドウ, タケシ","creatorNameLang":"ja-Kana"}],"familyNames":[{},{},{}],"givenNames":[{},{},{}],"nameIdentifiers":[{},{}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2018-05-15"}],"displaytype":"detail","filename":"j.polymdegradstab.2007.01.009.pdf","filesize":[{"value":"248.6 kB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"j.polymdegradstab.2007.01.009.pdf","url":"https://kyutech.repo.nii.ac.jp/record/5551/files/j.polymdegradstab.2007.01.009.pdf"},"version_id":"5a727762-f1ab-4099-a81e-dff7dce083ce"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"Poly(L-lactic acid)","subitem_subject_scheme":"Other"},{"subitem_subject":"L,L-lactide","subitem_subject_scheme":"Other"},{"subitem_subject":"Chemical recycling","subitem_subject_scheme":"Other"},{"subitem_subject":"Racemization","subitem_subject_scheme":"Other"},{"subitem_subject":"Ester–semiacetal tautomerization","subitem_subject_scheme":"Other"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"journal article","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_title":"Racemization Behavior of L,L-Lactide during Heating","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Racemization Behavior of L,L-Lactide during Heating"}]},"item_type_id":"21","owner":"3","path":["9"],"pubdate":{"attribute_name":"公開日","attribute_value":"2018-05-15"},"publish_date":"2018-05-15","publish_status":"0","recid":"5551","relation_version_is_last":true,"title":["Racemization Behavior of L,L-Lactide during Heating"],"weko_creator_id":"3","weko_shared_id":3},"updated":"2024-04-02T08:32:59.567418+00:00"}