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Water-reducers, or plasticizers, are chemical admixtures used in concrete to improve strength and workability. These additives reduce the water-cement ratio without compromising workability, lower the cement content while maintaining the same workability, or increase workability to assist concrete placement in inaccessible areas.
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The Effect of Construction and Demolition Waste Plastic Fractions on Wood-Polymer Composite Properties
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Xylan Plastic.

Siyu Jia1, Ziwen Lv1, Jun Rao1

  • 1Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China.

ACS Nano
|July 13, 2023
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel biodegradable plastic from xylan using double cross-linking. This high-performance xylan plastic (XP) offers enhanced mechanical properties, shape-reprogrammability, and biodegradability, addressing plastic pollution.

Keywords:
biodegradabilitydouble cross-linkinghigh toughnessplasticxylan

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Environmental Science

Background:

  • Growing plastic waste poses significant environmental challenges.
  • Biodegradable plastics offer a potential solution but face scientific hurdles.
  • Xylan, derived from industrial waste, is explored as a sustainable plastic precursor.

Purpose of the Study:

  • To develop a high-performance, biodegradable plastic from xylan.
  • To enhance the mechanical properties and processability of xylan-based materials.
  • To create a sustainable plastic alternative with potential for large-scale production.

Main Methods:

  • Fabrication of xylan plastic (XP) via a double cross-linking strategy (etherification and hot pressing).
  • Characterization of mechanical properties (tensile strength, toughness, modulus) and thermal behavior (DMA).
  • Assessment of shape-reprogrammability, optical properties, cytotoxicity, and biodegradability.

Main Results:

  • XP exhibited significantly enhanced toughness and mechanical strength (55 MPa tensile strength, 2.2 MJ/m³ toughness, 1.7 GPa modulus).
  • The material demonstrated thermoplasticity, enabling hot forming and repeated shape reprogramming via water molecule interaction.
  • XP showed excellent nontoxicity and biodegradability within 60 days, with low thermal expansion and good optical properties.

Conclusions:

  • The double cross-linking method successfully produced high-performance, biodegradable xylan plastic (XP).
  • XP offers a tunable, shape-reprogrammable, and environmentally friendly alternative to traditional plastics.
  • This approach provides a viable pathway for scalable production of sustainable plastics from industrial waste.