Abstract
Dynamic networks constructed by physical cross-links between polymer chains can change their structure through the association and dissociation of cross-linking points. This paper yields experimental data about the transient change of the dynamic storage modulus G′ for a molten random copolymer of vinyl acetate and vinyl alcohol with a vinyl alcohol content of 60 mol%, in which physical cross-links are formed via hydrogen bonding. As the cross-link density depends on temperature, the storage modulus G′ of the system slowly evolves toward equilibrium at the experimental temperature, Ta, after changing the temperature from higher or lower than Ta. The characteristic time scale for the equilibration is on the order of 103~104 s (depending on Ta) and the time evolution curves of G′ are dependent on the thermal history. The ‘memory effect’ (the structure developed at a certain temperature is preserved after changing the temperature) found in the system is discussed in detail.
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This work was supported by JSPS KAKENHI Grant Number 21350126.
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Urakawa, O., Shimizu, A., Fujita, M. et al. Memory effect in elastic modulus of a hydrogen-bonding polymer network. Polym J 49, 229–236 (2017). https://doi.org/10.1038/pj.2016.113
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DOI: https://doi.org/10.1038/pj.2016.113
