New material design of multi-stereo block poly(lactic acid)s by controlling the block length and the total molecular weight

• 資料種別: 博士論文
• タイトル: New material design of multi-stereo block poly(lactic acid)s by controlling the block length and the total molecular weight
• 著者・編者: YOHANES WINDU WIDHIANTO
• 著者標目: YOHANES WINDU WIDHIANTO
• 出版年月日等: 2017-09-25
• 出版年（W3CDTF）: 2017-09-25
• 並列タイトル等: ブロック長と分子量を制御したマルチステレオブロックポリ乳酸の合成とその物性
• 授与機関名: 京都工芸繊維大学
• 授与年月日: 2017-09-25
• 報告番号: 甲第859号
• 学位: 博士（工学）
• 本文の言語コード: eng
• 著者別名: ヨハネス ウィンドゥ ウィディアント
• 件名標目: stereo block poly(lactic acid); block length; molecular weight; stereocomplex; thermal property; multi stereoblock
• 対象利用者: 一般
• 一般注記: 出版タイプ： VoR; Poly(lactide) (PLA) is one of the bio-based polymers synthesized from renewable resources and has been expected to be replaced to the conventional fossil resource-based materials. Blending of two isomeric PLAs, poly(L-lactide) (PLLA) and poly(D-lactide) (PDLA), leads to the stereocomplex (sc) formation. However, both hc and sc tend to co-exist in the simple blend of PLLA and PDLA. On the other hand, only sc tends to form in the block copolymer of L- and D-lactic acids (sb-PLA). In this study, oligo-D-lactic acids with various molecular weights were synthesized by the 1st ROP of D-lactide. Then tri-sb-PLAs were synthesized by the 2nd ROP of L-lactide using oligo-D-lactic acids as a macro-initiator. Further the chain extension reaction was performed for these tri-sb-PLAs to obtain multi-sb-PLAs. This method is characterized by the well controlled block length and composition of the resultant multi-sb-PLAs because they ought to be determined by the molecular weights of the starting PDLA and PLLA prepolymers. Although the total molecular weight of di- and tri-sb-PLAs are directly related to the block length, that of the multi-sb-PLA can be designed independently of the block length. So the effects of the block lengths and the total molecular weight of the multi-sb-PLA on the thermal property and the crystallization behavior can be examined separately.
• 記録形式（IMT）: application/pdf
• 一次資料へのリンクURL: 全文 （fulltext）; https://kit.repo.nii.ac.jp/record/2000286/files/D1-0859_h1.pdf
• オンライン閲覧公開範囲: インターネット公開
• 連携機関・データベース: 国立情報学研究所 : 学術機関リポジトリデータベース（IRDB）（機関リポジトリ）; https://irdb.nii.ac.jp
• 提供元機関・データベース: 京都工芸繊維大学 : ＫＩＴ学術成果コレクション

• 要約等: In this study, multi-stereo block poly(lactic acid)s (multi-sb-PLAs) with molecular weights of approximately 60,000 and 130,000 with various block len...