DOI QR코드

DOI QR Code

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 (성균관대학교 과학기술연구소) ;
  • 이상은 (성균관대학교 화학공학과)
  • Kim, Moon-Sun (Institude of Science and Technology, Sungkyunkwan University) ;
  • Lee, Sangeun (Department of Chemical Engineering, Sungkyunkwan University)
  • 투고 : 2014.11.04
  • 심사 : 2015.04.14
  • 발행 : 2015.06.10

초록

본 연구에서는 L-lactide를 이용하여 수평균분자량(Mn)과 중량평균분자량($M_w$)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($M_n$)과 중량평균분자량($M_w$)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($T_g$)는 $95.5^{\circ}C$, 열분해 개시온도는 $289^{\circ}C$이었다. PLA에 PLLA-block-PMMA를 9 phr 혼용하고 $95^{\circ}C$에서 3배 이축연신한 다음 $120^{\circ}C$에서 2 min 동안 저온열처리하여 두께가 $50{\pm}3{\mu}m$인 PLA 필름을 제조하였다. 550 nm 파장에서 측정한 PLA 필름의 빛투과율은 88.5%, 인장강도는 44.5 MPa이었으며 PLA 필름의 인장강도를 현 수준보다 개선하기 위해서는 이축연신후 $120^{\circ}C$의 온도조건에서 2 min보다 긴 저온열처리시간이 필요하였다.

키워드

oriented PLA film;PLLA-block-PMMA;PLLA-Br intermediate;simultaneous biaxially orientation;ring-opening polymerization

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