Effect of cross-linking/fillers on relaxation time

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Discussion Overview

The discussion centers on the effect of cross-linking and fillers on the relaxation time of polymers. Participants explore how these factors influence chain mobility and the resulting implications for relaxation time, considering both theoretical and conceptual aspects.

Discussion Character

  • Exploratory, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant suggests that both cross-linking and fillers restrict chain mobility, leading to uncertainty about whether relaxation time increases or decreases.
  • Another participant proposes that adding more cross-links would result in a decrease in relaxation time.
  • A follow-up question seeks clarification on the reasoning behind the assertion that relaxation time decreases with increased cross-linking.
  • Another participant reiterates the request for clarification, suggesting that increased cross-linking would make the polymer structure stiffer by shortening the segments between cross-links.

Areas of Agreement / Disagreement

Participants express differing views on the relationship between cross-linking, fillers, and relaxation time, indicating that the discussion remains unresolved.

Contextual Notes

The discussion includes assumptions about the effects of cross-linking and fillers on polymer behavior, which may depend on specific material properties and definitions of relaxation time.

generous
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Hello all

I'm glad to join the forums and having the opportunity of having some scientific discussions

I'd like to discuss with you the effect of cross-linking or adding fillers to the relaxation of a polymer

I believe that they have the same effect..as both lead to the restriction of the chain mobility

but the question is...as a result, does the relaxation time increase or decrease?

restricting the chain mobility means that there will be no motion and consequently the relaxation time decrease? or it means that the motion will take place but at longer time scales..so the relaxation time increases?

I appreciate your help as it is really confusing for me
 
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If more and more cross links were added, the relaxation time would have to decrease.
 
thanks for your answer..but can you clarify why?
 
generous said:
thanks for your answer..but can you clarify why?
It would make the structure stiffer by shortening the segments between cross links.
 

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