Mechanical and barrier properties of poly(lactic acid) films coated by nanoclay–ink composition

Authors

  • Hyun Kyung Kim,

    1. Korea Food Research Institute, 516 Baekhyundong Bungdanggu Songnamsi, Kyounggido 466-746, Republic of Korea
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    • H. K. Kim has contributed to this research as first author and both S.-H. Park and H. J. Park have equally contributed to this research as co-corresponding authors.

  • Seong Jin Kim,

    1. CJ Cheil Jedang Food F&D Package Development Center, CJ CjeilJedang Corporation, Jungnim-Dong Jung-Gu, Seoul 100-791, Republic of Korea
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  • Hyun Soo Lee,

    1. Research Development Department, Lotte Aluminum, 1005 Doksan-dong, Geumcheon-Gu, Seoul 153-010, Republic of Korea
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  • Jae Hoon Choi,

    1. Research Development Department, Lotte Aluminum, 1005 Doksan-dong, Geumcheon-Gu, Seoul 153-010, Republic of Korea
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  • Chang Myeong Jeong,

    1. Research Development Department, Lotte Aluminum, 1005 Doksan-dong, Geumcheon-Gu, Seoul 153-010, Republic of Korea
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  • Myoung Hwan Sung,

    1. Research Development Department, Lotte Aluminum, 1005 Doksan-dong, Geumcheon-Gu, Seoul 153-010, Republic of Korea
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  • Seok-Hoon Park,

    1. College of Life Sciences and Biotechnology, Korea University, Anam-Dong, Sungbuk-Ku, Seoul 136-701, Republic of Korea
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    • H. K. Kim has contributed to this research as first author and both S.-H. Park and H. J. Park have equally contributed to this research as co-corresponding authors.

  • Hyun Jin Park

    Corresponding author
    1. College of Life Sciences and Biotechnology, Korea University, Anam-Dong, Sungbuk-Ku, Seoul 136-701, Republic of Korea
    2. Department of Packaging Science, Clemson University, Clemson, South Carolina 29634-0320
    • College of Life Sciences and Biotechnology, Korea University, Anam-Dong, Sungbuk-Ku, Seoul 136-701, Republic of Korea
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    • H. K. Kim has contributed to this research as first author and both S.-H. Park and H. J. Park have equally contributed to this research as co-corresponding authors.


Abstract

In this study, poly(lactic acid) (PLA) films were coated by an ink formulation containing nanoclay dispersed with ultrasonic homogenization for 20 min. Mechanical and barrier properties of the coated films were evaluated according to clay type and concentration. PLA films coated by ink formulations containing Cloisite 30B displayed the best mechanical and barrier properties in six types of nanoclays. PLA films coated by Cloisite 30B-containing ink varying in clay concentration were investigated. Tensile strength and elongation at break of these coated films were improved in 1% Cloisite 30B. Oxygen permeability decreased significantly upon the addition of clay levels up to 1% and slightly decreased with further increases in the amount of the clay. The value of water vapor permeability also decreased depending on the increases of clay (0%–20%). When the clay content in the sample was 2.0%, the surface of coated PLA films displayed aggregation visible using film emission scanning electron microscopy. X-ray diffractometry and transmission electron microscopy indicated that a mixture of exfoliated and intercalated structure was formed with addition of 1% (w/w) Cloisite 30B to the ink after ultrasonication. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

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