Preparation of High-Molecular-Weight Poly(1,4-butylene carbonate-co-aromatic ester) and its chopping to Produce Macropolyols
- 주제(키워드) Macropolyol , Polyurethane , CO2-utilization , Dimethyl carbonate , Polycondensation
- 발행기관 아주대학교
- 지도교수 이분열
- 발행년도 2016
- 학위수여년월 2016. 2
- 학위명 석사
- 학과 및 전공 일반대학원 분자과학기술학과
- 실제URI http://www.dcollection.net/handler/ajou/000000021671
- 본문언어 영어
- 저작권 아주대학교 논문은 저작권에 의해 보호받습니다.
초록/요약
The condensation of a mixture of dimethyl carbonate (DMC) and the phthalate derivatives (dimethyl terephthalate, dimethyl isophthalate, and dimethyl phthalate) with 1,4-butanediol (BD), using a sodium alkoxide catalyst, generated high-molecular-weight poly(1,4-butylene carbonate-co-aromatic ester)s with Mn values of 50000−120000. The subsequent addition of polyols (BD, glycerol propoxylate, 1,1,1-tris(hydroxymethyl)ethane, or pentaerythritol) chopped the generated high-molecular-weight polymers to afford macrodiols or macropolyols with facile control of their molecular weight (Mn, 2000−3000) and unique chain topological composition. Macropolyols prepared by chopping poly(1,4-butylene carbonate-co-terephthalate) were waxy in nature, whereas those containing isophthalate and phthalate units were instead oily. The glass transition temperatures observed for the macropolyols increased from −50 to −30 °C upon increasing the proportion of aromatic ester units, and the viscosity of the oily compounds increased on incorporating the aromatic ester units. DMC is a benign chemical produced from CO2; phthalate derivatives are also inexpensive chemicals that can be produced on a large scale. The macropolyols synthesized by this chopping method may have potential applications in the polyurethane industry.
more목차
1. Introduction 1
2. Experimental 3
2.1 General remarks 3
2.2 Preparation of high-molecular-weight poly(1,4-butylene carbonate-co-aromatic ester)s 3
2.3 Chopping the high-molecular-weight poly(1,4-butylene carbonate-co-aromatic ester)s 4
3. Results and discussion 5
3.1 Preparation of high-molecular-weight poly(1,4-butylene carbonate-co-aromatic ester)s 5
3.2 Chopping the high-molecular-weight poly(1,4-butylene carbonate-co-aromatic ester)s 7
3.3 Properties and characterization of the macropolyols 14
4. Conclusions 19
5. Acknowledgements 20
6. Reference 21
