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Related Concept Videos

Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

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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Fabrication of a Bioactive, PCL-based "Self-fitting" Shape Memory Polymer Scaffold
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High-Temperature Response Polylactic Acid Composites by Tuning Double-Percolated Structures.

Haiwei Yao1, Rong Xue2, Chouxuan Wang2

  • 1Textile and Clothing, College of Chemical Engineering, Shaanxi Polytechnic Institute, Xianyang 712000, China.

Polymers
|January 8, 2023
PubMed
Summary
This summary is machine-generated.

This study developed a stable positive temperature coefficient (PTC) material using graphene nanoplatelets (GNPs) in polylactic acid (PLA) and polybutylene adipate terephthalate (PBAT) composites. The material shows enhanced electrical conductivity and a significant PTC effect, making it suitable for thermistors.

Keywords:
crystallizationelectrical conductivitypositive temperature coefficienttemperature response behavior

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Area of Science:

  • Materials Science
  • Polymer Science
  • Nanotechnology

Background:

  • Electrically conductive polymer composites (CPCs) are utilized in polymer thermistors due to their positive temperature coefficient (PTC) and negative temperature coefficient (NTC) effects.
  • Developing stable PTC materials is crucial for advanced thermistor applications.

Purpose of the Study:

  • To create a dual percolated conductive microstructure for a stable PTC material.
  • To investigate the impact of graphene nanoplatelets (GNPs) and polybutylene adipate terephthalate (PBAT) on polylactic acid (PLA) composites' properties.

Main Methods:

  • Injection molding was used to selectively distribute GNPs within the PBAT phase of PLA/PBAT composites.
  • Crystallization behavior, electrical conductivity, and temperature response were systematically investigated.

Main Results:

  • Graphene nanoplatelets (GNPs) significantly enhanced PLA crystallization, increasing onset temperature and decreasing half-time.
  • The addition of 5 wt% PBAT boosted electrical conductivity by nearly two orders of magnitude compared to PLA/GNPs.
  • Higher crystallinity positively correlated with increased electrical conductivity.

Conclusions:

  • PLA/PBAT/GNPs composites exhibit a notable positive temperature coefficient (PTC) effect.
  • The developed material demonstrates potential for stable and effective thermistor applications.