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Related Concept Videos

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 polymer...
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Related Experiment Video

Updated: Nov 27, 2025

Fabrication of Large-area Free-standing Ultrathin Polymer Films
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Polyurethane prepolymer-modified high-content starch-PBAT films.

Chenhao Zhang1, Fangping Chen2, Wei Meng1

  • 1Engineering Research Center for Biomedical Materials of Ministry of Education, East China University of Science and Technology, Shanghai, 200237, PR China.

Carbohydrate Polymers
|December 6, 2020
PubMed
Summary
This summary is machine-generated.

Modified starch-poly(butylene adipate co-terephthalate) films (MSPF) were developed using polyurethane prepolymer and amylose. These biodegradable films exhibit enhanced mechanical strength and oxygen barrier properties for packaging applications.

Keywords:
BiodegradableBlown filmModified starchPBATPolyurethane prepolymer

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Area of Science:

  • Materials Science
  • Polymer Science
  • Biomaterials Engineering

Background:

  • Biodegradable polymers are crucial for reducing plastic waste.
  • Improving the mechanical and barrier properties of starch-based films remains a challenge.
  • Poly(butylene adipate co-terephthalate) (PBAT) offers good flexibility but requires enhancement for specific applications.

Purpose of the Study:

  • To develop a modified starch-poly(butylene adipate co-terephthalate) film (MSPF) with improved mechanical and oxygen-barrier properties.
  • To investigate the effect of polyurethane prepolymer (PUP) modification and amylose content on MSPF characteristics.
  • To evaluate the potential of MSPF as a biodegradable material for packaging.

Main Methods:

  • Preparation of MSPF via extrusion blowing.
  • Modification of starch with polyurethane prepolymer (PUP) to enhance compatibility.
  • Blending PBAT with varying amylose contents.
  • Characterization of microstructures, crystallinity, mechanical properties (tensile strength, elongation at break), and oxygen-barrier capacity.

Main Results:

  • Successful preparation of MSPF with high starch content (up to 50%) and excellent performance.
  • PUP modification, amylose introduction, and extrusion blowing synergistically improved film properties.
  • Increased amylose content led to enhanced crystallinity, hydrophobicity, oxygen-barrier properties, and mechanical strength.
  • Maximum tensile strength of 10.6 MPa and elongation at break of 805.6% were achieved.

Conclusions:

  • MSPF demonstrates superior mechanical and oxygen-barrier properties compared to unmodified materials.
  • The developed MSPF is a promising candidate for biodegradable applications, including packaging materials, agricultural films, and garbage bags.
  • The synergistic approach effectively addresses limitations of traditional starch-based films.