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The behavior of elastoplastic materials under bending stresses, particularly in structural members with rectangular cross-sections, is crucial for predicting material responses and understanding failure modes. Initially, when a bending moment is applied, the stress distribution across the section follows Hooke's Law and is linear and elastic. This distribution means the stress increases from the neutral axis to the maximum at the outer fibers, up to the elastic limit.
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In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
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In this lesson, determine the ratio of the maximum bending moments applied to two metal pipes, given that both pipes can withstand a maximum stress of 100 MPa. Both pipes have an outer radius of 1.8 cm. Pipe A has an inner radius of 1.5 cm, and Pipe B has an inner radius of 1 cm. The ratio of the maximum bending moment applied to two metallic pipes, each with a different inner and outer radius, is determined by considering their dimensions. The inner radius of the first pipe is 1.5 cm, and for...
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Updated: Jan 29, 2026

Spray-Coated Melanin/PEDOT:PSS Films for Sustainable Organic Electrochemical Transistors
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CMC-Enabled PEDOT:PSS Film for High-Performance Electrochromic Material.

Ruiying Zhang1, Yuanyuan Liu2, Chaoqun Ji2

  • 1State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences, Jinan 250353, China.

Polymers
|January 28, 2026
PubMed
Summary

Researchers created a durable electrochromic film using sodium carboxymethyl cellulose (CMC) and PEDOT:PSS on a cellulose acetate (CA) film. This flexible material offers stable color-changing properties insensitive to mechanical stress, humidity, and temperature.

Keywords:
cellulose derivativecoloring efficiencyelectrochromicstability

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Polymer Science

Background:

  • Flexible, intelligent color-changing windows require advanced conductive composite layers.
  • Electrochromic materials and transparent substrates are key components for these windows.

Purpose of the Study:

  • To develop a high-performance electrochromic film (CPC) with enhanced stability and insensitivity to environmental factors.
  • To improve interfacial compatibility and deposition uniformity of electrochromic materials on flexible substrates.

Main Methods:

  • Coating sodium carboxymethyl cellulose (CMC)-dispersed PEDOT:PSS onto a cellulose acetate (CA) film.
  • Investigating the role of CMC in enhancing interfacial bonding and enabling uniform PEDOT:PSS deposition.
  • Evaluating the electrochromic performance, including optical modulation and response time.

Main Results:

  • The developed CPC film exhibits high optical modulation (60.1% to 3% transmittance change) and a fast response time of 2 s.
  • The CPC demonstrates excellent mechanical, humidity, and temperature insensitivity.
  • Stable coloring efficiency was maintained after 100 bending cycles and under various environmental conditions.

Conclusions:

  • The developed CPC electrochromic film offers a simplified structure and improved sustainability.
  • This material shows promise for robust and reliable intelligent color-changing window applications.
  • CMC plays a crucial role in achieving uniform and stable electrochromic film deposition on flexible substrates.