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

Hyun Kyung Kim, Seong Jin Kim, Hyun Soo Lee, Jae Hoon Choi, Chang Myeong Jeong, Myoung Hwan Sung, Seok Hoon Park, Hyun Jin Park

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)3823-3829
Number of pages7
JournalJournal of Applied Polymer Science
Volume127
Issue number5
DOIs
Publication statusPublished - 2013 Mar 5

Keywords

  • barrier
  • clay
  • coatings
  • films
  • mechanical properties

ASJC Scopus subject areas

  • Chemistry(all)
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Materials Chemistry

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