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New material design of multi-stereo block poly(lactic acid)s by controlling the block length and the total molecular weight
http://hdl.handle.net/10212/2435
http://hdl.handle.net/10212/24356f51588c-0e6f-4013-95ea-d3b86e36b144
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全文 (15.7 MB)
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内容の要約 (109.9 KB)
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内容・審査結果の要旨 (169.5 KB)
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| Item type | 学位論文 / Thesis or Dissertation(1) | |||||||||
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| 公開日 | 2019-09-17 | |||||||||
| タイトル | ||||||||||
| 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 | |||||||||
| 言語 | en | |||||||||
| その他のタイトル | ||||||||||
| その他のタイトル | 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 | |||||||||
| 言語 | ja | |||||||||
| 作成者 |
ヨハネス ウィンドゥ ウィディアント
× ヨハネス ウィンドゥ ウィディアント
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| アクセス権 | ||||||||||
| アクセス権 | open access | |||||||||
| アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||||||
| 主題 | ||||||||||
| 言語 | en | |||||||||
| 主題Scheme | Other | |||||||||
| 主題 | stereo block poly(lactic acid) | |||||||||
| 主題 | ||||||||||
| 言語 | en | |||||||||
| 主題Scheme | Other | |||||||||
| 主題 | block length | |||||||||
| 主題 | ||||||||||
| 言語 | en | |||||||||
| 主題Scheme | Other | |||||||||
| 主題 | molecular weight | |||||||||
| 主題 | ||||||||||
| 言語 | en | |||||||||
| 主題Scheme | Other | |||||||||
| 主題 | stereocomplex | |||||||||
| 主題 | ||||||||||
| 言語 | en | |||||||||
| 主題Scheme | Other | |||||||||
| 主題 | thermal property | |||||||||
| 主題 | ||||||||||
| 言語 | en | |||||||||
| 主題Scheme | Other | |||||||||
| 主題 | multi stereoblock | |||||||||
| 内容記述 | ||||||||||
| 内容記述タイプ | Abstract | |||||||||
| 内容記述 | 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 lengths were synthesized from di-block copolymers consisting of L- and D-blocks with the same length are connected with 1,12-dodecanediol (DMG), an initiator and hexamethylene diisocyanate (HMDI), a chain extender alternately. The effects of the block length and the molecular weight on the thermal properties, the isothermal crystallization behavior and the higher order structure of the multi-sb-PLAs were investigated. | |||||||||
| 言語 | en | |||||||||
| 内容記述 | ||||||||||
| 内容記述タイプ | Other | |||||||||
| 内容記述 | 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. | |||||||||
| 言語 | en | |||||||||
| 日付 | ||||||||||
| 日付 | 2017-09-25 | |||||||||
| 日付タイプ | Issued | |||||||||
| 言語 | ||||||||||
| 言語 | eng | |||||||||
| 資源タイプ | ||||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_db06 | |||||||||
| 資源タイプ | doctoral thesis | |||||||||
| 出版タイプ | ||||||||||
| 出版タイプ | VoR | |||||||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||||||
| 学位授与番号 | ||||||||||
| 学位授与番号 | 甲第859号 | |||||||||
| 学位名 | ||||||||||
| 言語 | ja | |||||||||
| 学位名 | 博士（工学） | |||||||||
| 学位授与年月日 | ||||||||||
| 学位授与年月日 | 2017-09-25 | |||||||||
| 学位授与機関 | ||||||||||
| 学位授与機関識別子Scheme | kakenhi | |||||||||
| 学位授与機関識別子 | 14303 | |||||||||
| 言語 | ja | |||||||||
| 学位授与機関名 | 京都工芸繊維大学 | |||||||||
