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Types of Step-Growth Polymers: Polyesters01:20

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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...
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Poly(lactic acid) based Pearl Layer Moistureproof Membrane for Flexible Laminated Packaging.

Ying Ma1, Jingming Zhao1, Yanqing Wang1

  • 1State Key Laboratory Base for Eco-Chemical Engineering, College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China.

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Summary

Researchers developed a bio-based polyurethane composite membrane inspired by nacre. Adding boron nitride significantly improved moisture resistance, making polylactic acid suitable for flexible packaging.

Keywords:
bio-based polymersbionic strategydamp proof membranespackagingspoly(L-lactic acid) (PLLA)

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Biomaterials

Background:

  • Petrochemical-based polymers contribute to environmental concerns.
  • Developing bio-based polymers like polylactic acid (PLA) offers a sustainable alternative.
  • Achieving high barrier properties in bio-based polymers remains a significant challenge.

Purpose of the Study:

  • To create a bio-based composite membrane with enhanced barrier properties.
  • To mimic the nacreous 'brick-and-mud' structure for improved material performance.
  • To explore the potential of polylactic acid (PLLA) in flexible packaging applications.

Main Methods:

  • Synthesized a bio-based polyurethane using Poly (L-lactic acid) (PLLA) and Polypropylene Glycol (PPG).
  • Incorporated boron nitride (BN) nanoparticles, acting as the 'brick' layer, into the PLLA-based polyurethane matrix.
  • Fabricated a biomimetic composite membrane (PU-PLLA/BN) with a nacre-inspired structure.

Main Results:

  • The addition of 5 wt.% boron nitride reduced water vapor permeability by over 50%.
  • Boron nitride incorporation increased the diffusion path length and tortuosity for gas molecules.
  • The resulting PU-PLLA/BN composite membrane exhibited excellent moisture resistance.

Conclusions:

  • The nacre-inspired biomimetic composite membrane demonstrates superior barrier properties.
  • Boron nitride is an effective additive for enhancing the moisture resistance of PLLA-based materials.
  • This pearl-inspired composite film shows significant promise for PLLA's application in flexible laminated packaging.