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Antiplasticization of polymer materials: Structural aspects and effects on mechanical and diffusion-controlled properties

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journal contribution
posted on 22.06.2020, 08:33 by Leno Mascia, Yannis KouparitsasYannis Kouparitsas, Davide Nocita, Xujin BaoXujin Bao
Antiplasticization of glassy polymers, arising from the addition of small amounts of plasticizer, was examined to highlight the developments that have taken place over the last few decades, aiming to fill gaps of knowledge in the large number of disjointed publications. The analysis includes the role of polymer/plasticizer molecular interactions and the conditions leading to the cross-over from antiplasticization to plasticization. This was based on molecular dynamics considerations of thermal transitions and related relaxation spectra, alongside the deviation of free volumes from the additivity rule. Useful insights were gained from an analysis of data on molecular glasses, including the implications of the glass fragility concept. The effects of molecular packing resulting from antiplasticization are also discussed in the context of physical ageing. These include considerations on the effects on mechanical properties and diffusion-controlled behaviour. Some peculiar features of antiplasticization regarding changes in Tg were probed and the effects of water were examined, both as a single component and in combination with other plasticizers to illustrate the role of intermolecular forces. The analysis has also brought to light the shortcomings of existing theories for disregarding the dual cross-over from antiplasticization to plasticization with respect to modulus variation with temperature and for not addressing failure related properties, such as yielding, crazing and fracture toughness.

History

School

  • Science

Department

  • Materials

Published in

Polymers

Volume

12

Issue

4

Pages

769

Publisher

MDPI

Version

VoR (Version of Record)

Rights holder

© The authors

Publisher statement

This is an Open Access Article. It is published by MDPI under the Creative Commons Attribution 4.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/

Acceptance date

26/03/2020

Publication date

2020-04-01

Copyright date

2020

eISSN

2073-4360

Language

en

Depositor

Dr Leno Mascia Deposit date: 20 June 2020

Article number

ARTN 769