Memory effect on the glass transition in vulcanized rubber

Area of Science:

• Materials Science
• Polymer Physics
• Rheology

Background:

• The glass-to-rubber transition in polymers is a critical phenomenon affecting material properties.
• Understanding memory effects in polymers is essential for predicting their long-term behavior and performance.
• Vulcanized rubber exhibits complex responses to thermal and mechanical stimuli.

Purpose of the Study:

• To investigate the memory effect in vulcanized rubber during glassification.
• To explore the role of strain history as a controlling parameter in the glass-to-rubber transition.
• To develop a model that explains the observed memory phenomena.

Main Methods:

• Experimental study of vulcanized rubber under controlled strain conditions.
• Development of a phenomenological model incorporating temperature and strain history.
• Analysis of experimental data using the proposed model to interpret results.

Main Results:

• The glassy state of vulcanized rubber demonstrably memorizes the entire time course of strain during glassification.
• This memory is not reducible to a single strain parameter but encompasses the strain history itself.
• The study highlights that the memory effect is a crucial aspect of the glass-to-rubber transition.

Conclusions:

• The proposed phenomenological model successfully interprets the experimental findings regarding strain history memory.
• The glassy state's memory of strain history is a key factor in the glass-to-rubber transition of vulcanized rubber.
• Further research is needed to address irreversible deformation effects beyond the current model's scope.