{"created":"2023-05-15T11:59:13.299749+00:00","id":5547,"links":{},"metadata":{"_buckets":{"deposit":"764eaff4-d86c-4f5a-9587-c934cba81f6e"},"_deposit":{"created_by":3,"id":"5547","owners":[3],"pid":{"revision_id":0,"type":"depid","value":"5547"},"status":"published"},"_oai":{"id":"oai:kyutech.repo.nii.ac.jp:00005547","sets":["8:9"]},"author_link":["22460","22458","22006","21961","8065"],"item_21_biblio_info_6":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2004-01-10","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"4","bibliographicPageEnd":"1205","bibliographicPageStart":"1197","bibliographicVolumeNumber":"45","bibliographic_titles":[{"bibliographic_title":"Polymer"}]}]},"item_21_description_4":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"To achieve the feed stock recycling of poly(L-lactide) (PLLA) to L,L-lactide, PLLA composites including alkali earth metal oxides, such as calcium oxide (CaO) and magnesium oxide (MgO), were prepared and the effect of such metal oxides on the thermal degradation was investigated from the viewpoint of selective L,L-lactide formation. Metal oxides both lowered the degradation temperature range of PLLA and completely suppressed the production of oligomers other than lactides. CaO markedly lowered the degradation temperature, but caused some racemization of lactide, especially in a temperature range lower than 250 °C. Interestingly, with MgO racemization was avoided even in the lower temperature range. It is considered that the effect of MgO on the racemization is due to the lower basicity of Mg compared to Ca. At temperatures lower than 270 °C, the pyrolysis of PLLA/MgO (5 wt%) composite occurred smoothly causing unzipping depolymerization, resulting in selective L,L-lactide production. A degradation mechanism was discussed based on the results of kinetic analysis. A practical approach for the selective production of L,L-lactide from PLLA is proposed by using the PLLA/MgO composite.","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":"info:doi/10.1016/j.polymer.2003.12.058","subitem_relation_type_select":"DOI"}}]},"item_21_relation_14":{"attribute_name":"情報源","attribute_value_mlt":[{"subitem_relation_name":[{"subitem_relation_name_text":"https://doi.org/10.1016/j.polymer.2003.12.058"}],"subitem_relation_type_id":{"subitem_relation_type_id_text":"https://doi.org/10.1016/j.polymer.2003.12.058","subitem_relation_type_select":"DOI"}}]},"item_21_rights_13":{"attribute_name":"権利","attribute_value_mlt":[{"subitem_rights":"Copyright (c) 2003 Elsevier Science 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":"0032-3861","subitem_source_identifier_type":"ISSN"}]},"item_21_text_28":{"attribute_name":"論文ID（連携）","attribute_value_mlt":[{"subitem_text_value":"10037578"}]},"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, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 1-1 Hibikino, Kitakyushu, 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, Faculty of Computer Science and Systems Engineering, Kyushu Institute of Technology, 680-4 Kawazu, Iizuka, Fukuoka, 820-8502, Japan"},{"subitem_text_value":"Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 1-1 Hibikino, Kitakyushu, Fukuoka 808-0196, Japan"},{"subitem_text_value":"Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan, Faculty of Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan"}]},"item_21_text_63":{"attribute_name":"連携ID","attribute_value_mlt":[{"subitem_text_value":"6991"}]},"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":"Fan,  Yujiang"}],"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":[{},{},{},{}]},{"creatorNames":[{"creatorName":"Mori,  Tomokazu"}],"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":"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":"2018-05-10"}],"displaytype":"detail","filename":"Polymer_45_4.pdf","filesize":[{"value":"361.1 kB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"Polymer_45_4.pdf","url":"https://kyutech.repo.nii.ac.jp/record/5547/files/Polymer_45_4.pdf"},"version_id":"3f28cc16-46f6-40b8-93dd-380d54988b9e"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"Thermal degradation","subitem_subject_scheme":"Other"},{"subitem_subject":"Poly(L-lactide)","subitem_subject_scheme":"Other"},{"subitem_subject":"Racemization","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":"Thermal degradation of poly(L-lactide): effect of alkali earth metal oxides for selective L,L-lactide formation","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Thermal degradation of poly(L-lactide): effect of alkali earth metal oxides for selective L,L-lactide formation"}]},"item_type_id":"21","owner":"3","path":["9"],"pubdate":{"attribute_name":"公開日","attribute_value":"2018-05-10"},"publish_date":"2018-05-10","publish_status":"0","recid":"5547","relation_version_is_last":true,"title":["Thermal degradation of poly(L-lactide): effect of alkali earth metal oxides for selective L,L-lactide formation"],"weko_creator_id":"3","weko_shared_id":3},"updated":"2024-04-02T08:41:12.069173+00:00"}