Earticle

초록

영어

Polyester was prepared through the esterification reaction between watsepaper liquefied by ethylene glycol and carboxylic acid. Liquefaction was carried out at the previously determined condition of 100 minutes, 160℃, and 3% sulfuric acid, and the hydroxyl value of the liquefied product was 411 mg KOH/g. In order to remove bubbles produced during the curing step, the method to introduce a slight nitrogen stream into reaction vessel and/or the method to preheat a polyester film at 85℃ before curing step were used alone or in combination. But if curing temperature was 130℃, simple method to cure a film for 5 hours at 130℃ without using both methods was found to be most effective. The polyesters prepared with various carboxylic acids showed significant different physical properties, and maleic acid was best among them. Also, the effect of reaction time and temperature, C/H (carboxyl group/hydroxyl group) ratio, and type of additive on the crosslinkage of polyester was investigated. Lithium hydroxide or citric acid as additive was used to enhance the crosslinkage of polyester and citric acid was proved to be much more effective than lithium hydroxide. The effect of reaction temperature on the crosslinkage was marginal, but the crosslinkage decreased above 130℃. The crosslinkage was 86% when the polyester was prepared at an optimum condition such as 130℃ and 15 minutes of reaction condition, 1.5 of C/H ratio, 130℃ and 5 hours of curing condition, and 10% addition of citric acid.

목차

Abstract
 1. 서론
 2. 재료 및 방법
  2.1. 재료
  2.2. 액화물 제조
  2.3. 산가 및 수산기가
  2.4. polyester 제조
  2.5. polyester의 가교도
 3. 결과 및 고찰
  3.1. 경화조건
  3.2. 가교도
 4. 결론
 References

키워드

저자

• 이동헌 [ Dong Hun Lee | 경상대학교 공과대학 생명화학공학과 및 공학연구원 ]
• 김창준 [ Chang-Joon Kim | 경상대학교 공과대학 생명화학공학과 및 공학연구원 ]
• 김성배 [ Sung Bae Kim | 경상대학교 공과대학 생명화학공학과 및 공학연구원 ]

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  KSBB Journal

• 간기

  격월간

• pISSN

  1225-7117

• 수록기간

  2009~2013

• 십진분류

  KDC 476 DDC 576