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Related Concept Videos

Superplasticizers01:30

Superplasticizers

394
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,...
394
Additives and Fillers in Concrete01:29

Additives and Fillers in Concrete

398
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...
398
Plasticizers01:31

Plasticizers

414
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.
Plasticizers function by using surface-active agents to create repulsive electrostatic forces between cement particles. This dispersion enhances the concrete's...
414

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Related Experiment Video

Updated: Mar 1, 2026

The Effect of Construction and Demolition Waste Plastic Fractions on Wood-Polymer Composite Properties
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Epoxy Matrices Modified by Green Additives for Recyclable Materials.

Martin L Henriksen1, Jens B Ravnsbaek2, Morten Bjerring3

  • 1Department of Engineering, Aarhus University, Hangøvej 2, 8200, Aarhus N, Denmark.

Chemsuschem
|May 31, 2017
PubMed
Summary
This summary is machine-generated.

A new recyclable epoxy matrix was developed using a bio-based disulfide additive. This green chemistry approach allows for material fractionation under mild conditions while maintaining excellent properties.

Keywords:
additivescystineepoxiesrenewable resourcesthermosets

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Green Chemistry

Background:

  • Epoxy-based thermosets are widely used but lack recyclability, posing environmental challenges.
  • Developing recyclable alternatives is crucial for sustainable industrial practices.

Purpose of the Study:

  • To create a recyclable epoxy matrix using a bio-based additive.
  • To demonstrate environmentally benign fractionation and property retention.

Main Methods:

  • Incorporation of a bio-based disulfide additive into a commercial epoxy system.
  • Analysis using Fourier-transform infrared spectroscopy (FTIR) and solid-state Nuclear Magnetic Resonance (NMR).
  • Evaluation of mechanical and thermal properties of the modified epoxy matrices.

Main Results:

  • The developed material can be fractionated under mild, environmentally friendly conditions.
  • Modified epoxy matrices exhibit comparable mechanical and thermal properties to commercial benchmarks.
  • Successful demonstration of additive formulation and fractionation adhering to green chemistry principles.

Conclusions:

  • A novel, recyclable epoxy matrix has been successfully developed.
  • The approach utilizes green chemistry principles for sustainable material design.
  • This innovation offers a promising environmentally benign alternative for epoxy-based thermosets.