고분자량의 poly(1,4-butylene carbonate-co-terephthalate) 합성과 열적 성질
Preparation of high-molecular-weight poly(1,4-butylene carbonate-co-terephthalate) and its thermal properties
- 주제(키워드) biodegradable polymer , comspostable polymer , PBCT , PBAT , 생분해성 고분자 , polyester , polycarbonate , 폴리에스터 , 폴리카보네이트
- 발행기관 아주대학교
- 지도교수 이분열
- 발행년도 2013
- 학위수여년월 2014. 2
- 학위명 석사
- 학과 및 전공 일반대학원 분자과학기술학과
- 실제URI http://www.dcollection.net/handler/ajou/000000016089
- 본문언어 영어
- 저작권 아주대학교 논문은 저작권에 의해 보호받습니다.
초록/요약
Condensation copolymerizations of 1,4-butanediol (BD), dimethyl carbonate (DMC), and dimethyl terephthalate (DMT) were conducted by a two-step procedure using sodium alkoxide (0.1–0.2 mol%) as a catalyst with a variable [DMT]/[BD] feed ratio. In the first step, oligomers bearing almost equal numbers of hydroxyl and methoxycarbonyl end-groups were generated, which were polycondensed mostly by the elimination of methanol at 190¬–210 °C under reduced pressure. By this procedure, high-molecular-weight poly(1,4-butylene carbonate-co-terephthalate)s (PBCTs) were easily prepared with Mw 60000¬–200000 in a reasonably short reaction time (~8.5 h) and even on large scale (110 g polymer/batch) in a 250 mL glass reactor. The PBCTs prepared at a high [DMT]/[BD] feed ratio 0.30¬–0.50 were semi-crystalline polymers with fast crystallization rates and melting temperatures in the range 95−146 °C, which were adjustable by the [DMT]/[BD] feed ratio. The glass transition temperatures were rather high around 0 °C. These thermal properties were comparable to those of commercialized compostable polyesters such as PLA, PHA, PBAT, and PBSA.
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