{"created":"2023-05-15T11:59:12.789521+00:00","id":5535,"links":{},"metadata":{"_buckets":{"deposit":"cac23436-1162-4de7-86f0-5576df93c6f2"},"_deposit":{"created_by":3,"id":"5535","owners":[3],"pid":{"revision_id":0,"type":"depid","value":"5535"},"status":"published"},"_oai":{"id":"oai:kyutech.repo.nii.ac.jp:00005535","sets":["8:24"]},"author_link":["21961","22006","8065","22410"],"item_21_biblio_info_6":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2004-05-06","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"2","bibliographicPageEnd":"251","bibliographicPageStart":"243","bibliographicVolumeNumber":"84","bibliographic_titles":[{"bibliographic_title":"Polymer Degradation and Stability"}]}]},"item_21_description_4":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"Thermal degradation of high molecular weight PLLA containing residual tin atoms was investigated as a means of controlling the reaction for feedstock recycling to L,L-lactide. To clarify the pyrolysis mechanism of the PLLA, three samples with different chain end structures were prepared, namely, as-polymerized PLLA-ap, precipitated-with-methanol PLLA-pr, and purified PLLA-H. From pyrolyzate and kinetic analyses, typical degradation mechanisms of Sn-containing PLLA were clarified. In other words, it was assumed that the pyrolysis of PLLA-ap proceeds through a zero-order weight loss process with the apparent Ea = 80-90 kJ mol-1, and with the occurrence of backbiting and transesterification reactions caused by Sn-alkoxide chain ends. The pyrolysis of PLLA-pr was also assumed to proceed via a zero-order weight loss process with apparent Ea = 120-130 kJ mol-1, with the proposed mechanism being Sn-catalyzed selective lactide elimination caused by Sn-carboxylate chain ends. Both pyrolysis of PLLA-ap and PLLA-pr produced L,L-lactide selectively. These degradation mechanisms and products are in contrast to those of PLLA-H, in which a large amount of diastereoisomers and cyclic oligomers were formed by random degradation. From this study, the complicated PLLA pyrolysis behavior as reported previously could be explained properly.","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.2003.11.008","subitem_relation_type_select":"DOI"}}]},"item_21_rights_13":{"attribute_name":"権利","attribute_value_mlt":[{"subitem_rights":"Copyright (c) 2004 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":"10037582"}]},"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, Faculty of Computer Science and Systems Engineering, Kyushu Institute of Technology, 680-4 Kawazu, Iizuka, Fukuoka, 820-8502, Japan"},{"subitem_text_value":"Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, 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, 4-3-6 Jonan, Yonezawa, Yamagata 992-8510, Japan"}]},"item_21_text_63":{"attribute_name":"連携ID","attribute_value_mlt":[{"subitem_text_value":"6977"}]},"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":"Mori,  Tomokazu"}],"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":"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":"2018-05-09"}],"displaytype":"detail","filename":"j.polymdegradstab.2003.11.008.pdf","filesize":[{"value":"443.8 kB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"j.polymdegradstab.2003.11.008.pdf","url":"https://kyutech.repo.nii.ac.jp/record/5535/files/j.polymdegradstab.2003.11.008.pdf"},"version_id":"5a1c3fcf-a117-40a0-a79c-888c44846241"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"poly(L-lactic acid)","subitem_subject_scheme":"Other"},{"subitem_subject":"poly(L-lactide)","subitem_subject_scheme":"Other"},{"subitem_subject":"PLLA","subitem_subject_scheme":"Other"},{"subitem_subject":"thermal degradation","subitem_subject_scheme":"Other"},{"subitem_subject":"pyrolysis","subitem_subject_scheme":"Other"},{"subitem_subject":"kinetic analysis","subitem_subject_scheme":"Other"},{"subitem_subject":"feedstock recycling","subitem_subject_scheme":"Other"},{"subitem_subject":"end structure","subitem_subject_scheme":"Other"},{"subitem_subject":"kinetic parameter","subitem_subject_scheme":"Other"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"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":"Effects of Chain End Structures on Pyrolysis of Poly(L-lactic acid) Containing Tin Atoms","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Effects of Chain End Structures on Pyrolysis of Poly(L-lactic acid) Containing Tin Atoms"}]},"item_type_id":"21","owner":"3","path":["24"],"pubdate":{"attribute_name":"公開日","attribute_value":"2018-05-09"},"publish_date":"2018-05-09","publish_status":"0","recid":"5535","relation_version_is_last":true,"title":["Effects of Chain End Structures on Pyrolysis of Poly(L-lactic acid) Containing Tin Atoms"],"weko_creator_id":"3","weko_shared_id":3},"updated":"2023-10-26T01:11:44.242397+00:00"}