Article
  • Thermal and Mechanical Properties of Poly(L-lactic Acid) Films Plasticized with Propylene Carbonate
  • Ganggook Lee, Hee Min Lee, and Young Ho Kim

  • Department of Organic Materials and Fiber Engineering, Soongsil University, Dongjak-gu, Seoul 06978, Korea

  • 프로필렌 카보네이트로 가소화시킨 폴리(L-락트산) 필름의 열적 및 기계적 특성
  • 이강국 · 이희민 · 김영호

  • 숭실대학교 유기신소재·파이버공학과

Abstract

Propylene carbonate (PC) was added to poly(L-lactic acid) (PLA) film in order to improve both low elongation- at-break and low impact strength, and the plasticization effect of PC on PLA was examined. PLA films containing various amounts of PC were prepared by melt pressing after melt pre-mixing, and their thermal properties were analyzed with a thermogravimetric analyzer, differential scanning calorimeter, and dynamic mechanical analyzer; mechanical properties with a universal testing machine and charpy impact testing machine; crystallinity and morphology with a wide angle X-ray diffractometer and scanning electron microscope. As the PC content in PLA/PC film increased, glass transition temperature, cold crystallization temperature, and melting temperature of PLA shifted to lower temperature and the crystallinity decreased, while the crystal form was unchanged. The yield stress, initial modulus, and tensile stress-at-break of the films decreased but the tensile strain-at-break and impact strength increased dramatically with increasing PC content. All the results indicated that PC acts as a plasticizer for PLA.


폴리(L-락트산)(PLA)에 프로필렌 카보네이트(PC)를 첨가하여 PLA의 낮은 파단신도와 충격강도를 개선하면서 PC가 PLA의 가소제로 작용하는지에 대한 연구를 진행하였다. 이를 위해 여러 함량의 PC가 포함된 PLA/PC 필름을 용융압착법으로 제조한 후 열중량분석기, 시차주사열량분석기, 동적기계적분석기로 열적 특성을, 만능시험기 및 Charpy 충격시험기로 기계적 물성을, 광각 X-선과 주사전자현미경으로 결정형태와 모폴로지를 분석하였다. 실험결과, PLA/PC 필름에 PC 함량이 많아짐에 따라 유리전이온도, 냉결정화온도, 용융온도가 모두 낮아지면서 결정화도가 감소하였지만, PLA 결정형태는 일정하였다. 또한 PLA/PC 필름의 항복응력, 초기탄성률 및 파단응력은 감소하였지만 파단변형률과 충격강도는 크게 증가하였다. 이러한 모든 결과들이 PC가 PLA의 가소제로 작용한다는 것을 나타내었다.


Keywords:

  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2022 Impact Factor : 0.4
  • Indexed in SCIE

This Article

  • 2019; 43(1): 113-122

    Published online Jan 25, 2019

  • 10.7317/pk.2019.43.1.113
  • Received on Aug 15, 2018
  • Revised on Sep 10, 2018
  • Accepted on Sep 14, 2018

Correspondence to

  • Young Ho Kim
  • Department of Organic Materials and Fiber Engineering, Soongsil University, Dongjak-gu, Seoul 06978, Korea

  • E-mail: ssyhkim@ssu.ac.kr