Analysis of Thermal Aging Influence on Selected Physical and Mechanical Characteristics of Polyaddition and Polycondensation Poly(dimethylsiloxane)

Author:

Chmielnicka Ewelina1ORCID,Szymiczek Małgorzata2ORCID,Sarraj Sara2ORCID,Jurczyk Sebastian1ORCID

Affiliation:

1. Łukasiewicz Research Network—Institute of Engineering of Polymer Materials and Dyes, M. Skłodowskiej-Curie St. 55, 87-100 Torun, Poland

2. Institute of Theoretical and Applied Mechanics, Faculty of Mechanical Engineering, Silesian University of Technology, Konarskiego St. 18A, 44-100 Gliwice, Poland

Abstract

The aim of the study was to determine the effect of accelerated thermal aging on the properties of selected poly(dimethylsiloxanes) (PDMS) differing in viscosity and hardness. This was related to the potential application for specialist casting molds with complex geometry. Four polyaddition silicones and two polycondensation ones were selected. As part of the work, tensile strength, hardness, density, roughness, and Dynamic Mechanical Analysis (DMA) and Fourier Transform Infrared Spectroscopy (FTIR) were tested, which allowed us to determine the degree of degradation of the analyzed materials subjected to thermal aging at a temperature of 150 ± 2 °C. The aging temperature was conditioned by the parameters of the materials that can be cast into molds made of poly(dimethylsiloxanes) e.g., with polymer resins, for which the exothermic peak ranges from 100 to 200 °C depending on the volume. It was observed that the initial Shore A hardness value affects parameters such as tensile strength or the amount of value change (its increase or decrease) after thermal aging. It can also be concluded that for polyaddition PDMS, the viscosity of the material has an effect on the size of the relative elongation value after thermal aging.

Funder

Ministry of Science and Higher Education

Publisher

MDPI AG

Subject

Polymers and Plastics,General Chemistry

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