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Related Concept Videos

Curing Methods01:26

Curing Methods

184
Concrete members with a small surface-to-volume ratio are cured by oiling and moistening the forms before casting the concrete member. These forms can be left in place for a prolonged period to prevent moisture loss, and can be wetted if made of a material suitable for wetting. If the forms are removed early, the concrete member is moistened and covered with polythene sheets to maintain moisture. For large horizontal concrete surfaces exposed to dry weather, a temporary covering is suspended...
184
Curing of Concrete01:20

Curing of Concrete

245
The hydration of cement takes place within the water-filled capillary pores. However, environmental elements can disrupt this process by evaporating water from the concrete surfaces. Sealed concrete with a water-cement ratio below 0.5 experiences self-desiccation, leading to water loss. The water loss in concrete is mitigated by curing. This technique involves keeping the concrete saturated to maintain the necessary temperature and moisture conditions, to optimally fill the spaces in the cement...
245
Accelerated Curing of Concrete01:25

Accelerated Curing of Concrete

324
Accelerating concrete curing is achieved by applying heat and additional moisture. This process accelerates the hydration of the cement, resulting in an earlier strength gain in the concrete. Steam curing is a method wherein the concrete products are either transported through a chamber on a conveyor belt or encased in plastic, allowing steam at atmospheric pressure to circulate freely around them. This process begins with a phase of moist curing that typically lasts between 3 to 5 hours, after...
324

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Related Experiment Video

Updated: Nov 23, 2025

Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction
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Reliable Condensation Curing Silicone Elastomers with Tailorable Properties.

Alena Jurásková1,2, Stefan Møller Olsen2, Kim Dam-Johansen3

  • 1DPC, Department of Chemical and Biochemical Engineering, Technical University of Denmark (DTU), Building 227, 2800 Kgs. Lyngby, Denmark.

Molecules (Basel, Switzerland)
|December 30, 2020
PubMed
Summary
This summary is machine-generated.

Investigating condensation curing silicone elastomers reveals that post-curing reactions significantly impact mechanical stability and final properties. Optimizing cross-linker parameters yields high-performance silicone coatings without fillers.

Keywords:
coatingscondensation curingnetwork structurereinforcing cross-linker domainssilicone elastomersstability

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Surface Engineering

Background:

  • Condensation curing silicone elastomers are susceptible to long-term stability issues.
  • Mechanical instability can lead to premature application failure and reduced service life.

Purpose of the Study:

  • To investigate the stability of various condensation curing silicone elastomer compositions.
  • To understand how post-curing reactions affect elastomer properties.
  • To develop reliable silicone elastomer coatings with tailored properties.

Main Methods:

  • Synthesized elastomers using silanol-terminated polydimethylsiloxane (HO-PDMS-OH) and different cross-linkers.
  • Analyzed the impact of two key post-curing reactions on mechanical stability.
  • Tailored coating properties by adjusting cross-linker molecular weight, type, and concentration.

Main Results:

  • Identified post-curing condensation of polymer chains and cross-linker reactions as critical factors for stability.
  • Demonstrated that elastomer properties are significantly influenced by these post-curing processes.
  • Achieved excellent scratch resistance and electrical breakdown strength in coatings without fillers.

Conclusions:

  • The long-term stability and final properties of condensation curing silicone elastomers are critically dependent on post-curing reactions.
  • Careful selection of cross-linker parameters (molecular weight, type, concentration) enables the development of high-performance silicone elastomer coatings.
  • Filler-free silicone elastomer coatings with superior mechanical and electrical properties are achievable.