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Synthesis of PLLA-block-PMMA Copolymer and Characteristics of Biaxially Oriented PLA Film Including the Same

PLLA-block-PMMA 공중합수지의 합성 및 이를 포함하는 PLA 이축연신 필름의 특성

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

Abstract

In the study, PLLA with 12,000 g/mol ($M_n$) and 14,000 g/mol ($M_w$) was synthesized from L-lactide, and used to synthesize PLLA-Br intermediate. PLLA-block-PMMA with 84,000 g/mol ($M_n$) and 126,000 g/mol ($M_w$) was finally synthesized from PLLA-Br intermediate. The glass transition temperature ($T_g$) and initial pyrolysis temperature of PLLA-block-PMMA are $95.5^{\circ}C$ and $289^{\circ}C$, respectively. The PLA film of $50{\pm}3{\mu}m$ thickness was prepared by blending PLA with 9 phr PLLA-block-PMMA followed by stretching biaxially at 3 times under $95^{\circ}C$, and annealing at $120^{\circ}C$ 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 $120^{\circ}C$ 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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