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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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Superplasticizers are advanced admixtures that enhance the workability of concrete by lowering the water content without compromising the strength of the material. These substances are highly effective water reducers, improving concrete flow, making it easier to work with, and enabling concrete to reach inaccessible areas or densely reinforced sections without mechanical vibration. The key components in superplasticizers are either sulfonated melamine or naphthalene formaldehyde condensates,...
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Structural Properties
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Hydrogen Bond-Mediated Strong Plasticization for High-Performance Alginate Plastics.

Hao Yan1, Junsheng Wang1, Cong Du1

  • 1State Key Laboratory of Bio-Fibers and Eco-Textiles, Collaborative Innovation Center of Marine Biobased Fiber and Ecological Textile Technology, College of Materials Science and Engineering, Qingdao University, 308 Ningxia Road, Qingdao, 266071, China.

Advanced Materials (Deerfield Beach, Fla.)
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Researchers developed a novel plasticization strategy using hydrogen bonds to create high-performance biodegradable plastics from sodium alginate. This method enhances material strength and processability, offering a sustainable alternative to synthetic plastics.

Keywords:
high strength filmshydrogen bond mediated plasticizationplasticspolysaccharide

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Biomaterials Engineering

Background:

  • Growing plastic pollution necessitates sustainable alternatives.
  • Polysaccharides, like sodium alginate, are promising biodegradable plastic candidates.
  • Polysaccharide chain rigidity hinders material processing and orientation.

Purpose of the Study:

  • To develop a general hydrogen bond-mediated plasticization strategy for sodium alginate (SA).
  • To fabricate high-performance alginate plastics with enhanced mechanical properties and processability.
  • To investigate the role of glycerol in modulating SA chain interactions and material characteristics.

Main Methods:

  • Utilized a hydrogen bond-mediated plasticization strategy involving glycerol and sodium alginate (SA).
  • Regulated isotropic SA chains into a highly ordered state.
  • Fabricated alginate plastics and characterized their mechanical properties (tensile strength, toughness) and processability.

Main Results:

  • Glycerol's hydroxyl groups formed strong hydrogen bonds with SA chains, enhancing viscoelasticity and stretchability at high solid content.
  • Highly oriented alginate films achieved superior tensile strength (575 MPa) and toughness (60.7 MJ m⁻³).
  • The plasticization strategy enabled high-fidelity plastic molding of solid-like SA with high solid content and large stretchability.

Conclusions:

  • Hydrogen bond-mediated plasticity is an effective strategy for enhancing polysaccharide-based plastics.
  • Developed alginate plastics exhibit high performance, outperforming many regenerated biomass films.
  • This approach offers a facile method to create high-performance, biodegradable plastics from abundant natural polymers.