Preparation of Large-scale Glycerol-based Organic Carbonates : Green Plasticizer for Polylactide
Preparation of Large-scale Glycerol-based Organic Carbonates: Green Plasticizer for Polylactide
- 주제(키워드) PLA , Polylactide , Blends , Organic carbonate compound , Biodegradable plasticizer
- 주제(DDC) 547
- 발행기관 아주대학교 일반대학원
- 지도교수 이분열
- 발행년도 2024
- 학위수여년월 2024. 8
- 학위명 석사
- 학과 및 전공 일반대학원 분자과학기술학과
- 실제URI http://www.dcollection.net/handler/ajou/000000034153
- 본문언어 영어
- 저작권 아주대학교 논문은 저작권에 의해 보호받습니다.
초록/요약
Polylactide (PLA; PLLA; Poly(L-lactide)) is a notable material derived from renewable sources and known for its biodegradability, though it requires specific industrial composting conditions. One significant drawback limiting PLA’s widespread use is its inherent brittleness, which causes it to fracture under minimal elongation despite its high tensile strength. A common solution to this issue is to blend PLA with plasticizers. In this study, a range of organic carbonates—namely, ethyl glycerol dicarbonate (1), methyl glycerol dicarbonate (2), glycerol carbonate (3), and acetyl glycerol carbonate (4)—were synthesized on a preparative scale (approximately 100 g) using renewable glycerol and CO2-derived diethyl carbonate (DEC) or dimethyl carbonate (DMC). Remarkably, 1–4 demonstrated biodegradability within a week under ambient conditions, confirmed through soil exposure at 25 °C—outpacing the degradation rate of cellulose materials in comparison. Further analysis revealed that compound 1 was particularly effect as a PLA plasticizer. The compatibility of PLA with up to 30 phr (parts per hundred resin) of the synthesized organic carbonates was systematically evaluated using differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), scanning electron microscopy (SEM), and rotation rheometry. These blends exhibited significantly improved ductility, as evidenced by tensile property measurements. Particularly, the novel plasticizer ethyl glycerol carbonate (1) demonstrated superior performance compared to the conventional plasticizer acetyltributylcitrate (ATBC) in terms of maintaining morphological stability. Unlike PLA/ATBC blends, which experienced slow crystallization over time at ambient temperature, PLA/1 blends retained their amorphous structure, thereby preventing plasticizer migration. This was corroborated by DMA analyses of both aged and unaged specimens. Despite these advantages, biodegradation tests indicated that the inclusion of biodegradable organic carbonate plasticizers did not enhance the biodegradability of PLA. The PLA matrix in the blends remained largely unchanged after 6 months of exposure to ambient soil conditions at 25 °C. This study highlights the potential of organic carbonates as eco-friendly plasticizers for PLA, promoting the development of sustainable and biodegradable polymer systems.
more목차
1. Introduction 1
2. Results and discussion 3
2.1 Preparation of glycerol based organic carbonates 3
2.2 Blending the organic carbonates with PLA 6
2.3 Biodegradability Studies 20
3. Experimental Section 22
3.1 General remarks 22
3.2 Ethyl glycerol decarbonate (1) 23
3.3 Methyl glycerol decarbonate (2) 24
3.4 Glycerol carbonate (3) 25
3.5 Acetyl glycerol carbonate (4) 25
3.6 Polymer blending 26
3.7 Biodegradable studies 26
4. Conclusions 27
5. Acknowledgements 28
6. References 29
7. Supporting Information 38
