화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Applied Chemistry for Engineering, Vol.26, No.3, 251-258, June, 2015
DOI10.14478/ace.2014.1121  Export Citation
PLLA-block-PMMA 공중합수지의 합성 및 이를 포함하는 PLA 이축연신 필름의 특성
Synthesis of PLLA-block-PMMA Copolymer and Characteristics of Biaxially Oriented PLA Film Including the Same
김문선†, 이상은1
  • 성균관대학교 과학기술연구소
  • 1성균관대학교 화학공학과
Moon-Sun Kim†, and Sangeun Lee1
  • Institude of Science and Technology, Sungkyunkwan University, Gyeonggi-do 440-746, Republic of Korea
  • 1Department of Chemical Engineering, Sungkyunkwan University, Gyeonggi-do 440-746, Republic of Korea
E-mail:
초록
본 연구에서는 L-lactide를 이용하여 수평균분자량(Mn)과 중량평균분자량(Mw)이 각각 12,000, 14,000 g/mol인 PLLA (Poly L-lactic acid) 수지를 합성하였으며, 이 PLLA를 이용하여 PLLA-Br 중간체를 합성하였다. PLLA-Br 중간체를 이용하여 수평균분자량(Mn)과 중량평균분자량(Mw)이 각각 84,000, 126,000 g/mol인 PLLA-block-PMMA (Poly L-lactic acid-block-Polymethyl methacrylate) 공중합체를 최종적으로 합성하였으며 PLLA-block-PMMA 공중합체의 유리전이온도 (Tg)는 95.5 ℃, 열분해 개시온도는 289 ℃이었다. PLA에 PLLA-block-PMMA를 9 phr 혼용하고 95 ℃에서 3배 이축연신한 다음 120 ℃에서 2 min 동안 저온열처리하여 두께가 50 ± 3 μm인 PLA 필름을 제조하였다. 550 nm 파장에서 측정한 PLA 필름의 빛투과율은 88.5%, 인장강도는 44.5 MPa이었으며 PLA 필름의 인장강도를 현 수준보다 개선하기 위해서는 이축연신후 120 ℃의 온도조건에서 2 min보다 긴 저온열처리시간이 필요하였다.
PLLA-Br intermediate. PLLA-block-PMMA with 84,000 g/mol (Mn) and 126,000 g/mol (Mw) was finally synthesized from PLLA-Br intermediate. The glass transition temperature (Tg) and initial pyrolysis temperature of PLLA-block-PMMA are 95.5 ℃ and 289 ℃, respectively. The PLA film of 50 ± 3 μm thickness was prepared by blending PLA with 9 phr PLLA-block-PMMA followed by stretching biaxially at 3 times under 95 ℃, and annealing at 120 ℃ for 2 min. The light transmittance at 550 nm and tensile strength of the film are 88.5% and 44.5 MPa, respectively. To enhance the tensile strength of PLA film, it was required to keep the film more than 2 min at 120 ℃ during the annealing step after a biaxially orientation.
Keywords:oriented PLA film;PLLA-block-PMMA;PLLA-Br intermediate;simultaneous biaxially orientation. ring-opening polymerization
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