Direct observation of desorption of a melt of long polymer chains.

Abstract:

:Tuning the thermodynamic state of a material has a tremendous impact on its performance. In the case of polymers placed in proximity of a solid wall, this is possible by annealing above the glass transition temperature, Tg, which induces the formation of an adsorbed layer. Whether heating to higher temperatures would result in desorption, thereby reverting the thermodynamic state of the interface, has so far remained elusive, due to the interference of degradation. Here, we employ fast scanning calorimetry, allowing to investigate the thermodynamics of the interface while heating at 104 K s-1. We show that applying such rate to adsorbed polymer layers permits avoiding degradation and, therefore, we provide clear-cut evidence of desorption of a polymer melt. We found that the enthalpy and temperature of desorption are independent of the annealing temperature, which, in analogy to crystallization/melting, indicates that adsorption/desorption is a first order thermodynamic transition.

journal_name

Nat Commun

journal_title

Nature communications

authors

Monnier X,Napolitano S,Cangialosi D

doi

10.1038/s41467-020-18216-y

subject

Has Abstract

pub_date

2020-08-28 00:00:00

pages

4354

issue

1

issn

2041-1723

pii

10.1038/s41467-020-18216-y

journal_volume

11

pub_type

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