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Related Concept Videos

Plasticizers01:31

Plasticizers

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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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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
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Superplasticizers01:30

Superplasticizers

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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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Additives and Fillers in Concrete01:29

Additives and Fillers in Concrete

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Additives and fillers are integral to enhancing the properties of concrete. Pozzolans and blast-furnace slag are additives or admixtures due to their reactions with calcium hydroxide released during cement hydration. Fillers, which are finely ground and similar in fineness to Portland cement, improve concrete attributes such as workability density, and reduce capillary bleeding or cracking. Some fillers possess hydraulic properties or participate in benign reactions within the cement paste.
The...
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Polymers: Molecular Weight Distribution01:10

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For any given polymer, the weight average molecular weight (Mw) is higher than, if not equal to, the number average molecular weight (Mn). The only situation in which the weight average molecular weight and the number average molecular weight are equal is when a polymer consists only of chains with equal molecular weight. However, this never happens in a synthetic polymer, since it is difficult to control the polymerization process up to a molecular level with accuracy to a hundred percent.
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Understanding the balance between additives' miscibility and plasticisation effect in polymer composites: a

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Summary

By adjusting plasticiser flexibility, not chemistry, researchers can control how they interact with polymer composites. This offers a simple design rule for optimizing filler dispersion or surface adsorption.

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Area of Science:

  • Polymer Science
  • Materials Chemistry
  • Computational Modeling

Background:

  • Plasticisers are crucial additives in polymer composites, influencing material properties by interacting with fillers and the polymer matrix.
  • Understanding the precise mechanisms of plasticiser adsorption and dispersion is key to tailoring composite performance.

Purpose of the Study:

  • To investigate the role of plasticiser conformational flexibility in controlling filler surface coverage and bulk dispersion within polymer composites.
  • To establish a general design principle for optimizing plasticiser behavior without altering their fundamental chemistry.

Main Methods:

  • Utilized a chemically specific coarse-grained computational model to simulate plasticiser-polymer-filler interactions.
  • Varied the conformational flexibility of plasticisers to observe effects on adsorption and dispersion.

Main Results:

  • Demonstrated that tuning plasticiser flexibility, rather than chemistry, effectively controls filler surface coverage and dispersion.
  • Showcased that entropically driven adsorption and clustering lead to a general phenomenon, independent of polymer type or molecular weight.
  • Identified specific flexibility ranges for maximizing either filler adsorption or matrix dispersion.

Conclusions:

  • Plasticiser conformational flexibility is a powerful, tunable parameter for controlling interactions in polymer composites.
  • The findings provide a practical, chemistry-independent design strategy for optimizing additive performance in materials.
  • This approach allows for targeted modification of composite processability and properties through simple plasticiser adjustments.