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研究生： Minh Chau Truong
Minh - Chau Truong
論文名稱： Synthesis Polylactide with Varying Molecular Weights
Synthesis Polylactide with Varying Molecular Weights
指導教授： 游進陽
Chin-Yang Yu
口試委員: 施劭儒
Shao-Ju Shih
堀江正樹
Masaki Horie
學位類別： 碩士
Master
系所名稱： 工程學院 - 材料科學與工程系
Department of Materials Science and Engineering
論文出版年： 2014
畢業學年度： 102
語文別： 英文
論文頁數： 99
中文關鍵詞： Polylactide 、ring-opening polymerization 、stannous octanoate
外文關鍵詞： Polylactide, ring-opening polymerization, stannous octanoate
相關次數： 點閱：112  下載：0 
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    • In this thesis, polylactide with various molecular weights and molecular weight distributions were synthesized by solution ring opening polymerization. Molecular weight was controlled by varying the ratio of L-lactide monomer to palmityl alcohol initiator and tin(II) octanoate was used as a catalyst for precise control over molecular weight. Anhydrous toluene was used as a non-reactive solvent to prevent the contamination of catalyst. Besides, we also try to obtain the standard molecular weight of PLA (greater than 100,000 g/mol) to compare with commercial PLAs. Properties of different molecular weights of PLA were characterized by gel permeation chromatography, thermogravimetric analysis, differential scanning calorimety, and 1H NMR spectroscopy.

    In this thesis, polylactide with various molecular weights and molecular weight distributions were synthesized by solution ring opening polymerization. Molecular weight was controlled by varying the ratio of L-lactide monomer to palmityl alcohol initiator and tin(II) octanoate was used as a catalyst for precise control over molecular weight. Anhydrous toluene was used as a non-reactive solvent to prevent the contamination of catalyst. Besides, we also try to obtain the standard molecular weight of PLA (greater than 100,000 g/mol) to compare with commercial PLAs. Properties of different molecular weights of PLA were characterized by gel permeation chromatography, thermogravimetric analysis, differential scanning calorimety, and 1H NMR spectroscopy.

    Table of contents Acknowledgement i Abstract ii Table of contents iii List of Figures v List of Tables vii Chapter 1. Introduction and Objectives 1 1.1 Motivations 2 1.2 Biodegradable Polymer 3 1.2.1 Definition 3 1.2.2 Classification 4 1.2.3 Biodegradation 6 1.2.4 Applications 7 1.2.4.1 Medical applications 8 1.2.4.2 Agricultural applications 8 1.2.4.3 Packaging applications 9 1.3 Poly(lactic acid) 10 1.3.1 Market Potential of Poly(lactic acid) 10 1.3.2 Advantages & Disadvantages of Poly(lactic acid) 12 1.3.3 Syntheses of Poly(lactic acid) 13 1.3.3.1 Precursors 14 1.3.3.2 Synthesis methods 17 1.3.4 Application of Poly(lactic acid) 26 1.3.4.1 Medical applications 26 1.3.4.2 Packaging Applications 28 1.4 Objectives 31 Chapter 2. Experimental 32 2.1 Materials 33 2.2 Experimental procedures 34 2.2.1 Purification of catalyst 34 2.2.2 Experimental procedures 36 2.2.3 Characterization techniques 38 2.2.3.1 Gel Permeation Chromatography (GPC) 38 2.2.3.2 Hydrogen Nuclear Magnetic Resonance Spectroscopy (1H NMR)…. 39 2.2.3.3 Differential scanning calorimetry (DSC) 41 Chapter 3. Results and Discussion 43 3.1 Overview of Controlling Molecular Weight of PLA 44 3.2 GPC Analysis 45 3.2.1 Synthesis of PLA 7200 45 3.2.2 Synthesis of PLA 14400 47 3.2.3 Synthesis of PLA 21600 49 3.2.4 Synthesis of PLA 72000 50 3.3 1H NMR Analysis 54 3.4 Themal Properties Analysis 56 Chapter 4. Conclusions 59 References 61 Appendix 65

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