ABOUT ONE METHOD OF STUDYING THE COEFFICIENT OF THERMAL EXPANSION OF POLYMERS

Author details

Aleksandr N. Trufanov
Perm National Research Polytechnic University, Perm, Russian Federation

https://doi.org/10.15593/perm.mech/2024.2.01

The problem of studying the deformation response of film samples made of UV-curable polymers to temperature changes is considered. It is difficult to obtain massive samples of these polymers due to the peculiarities of their polymerization. This paper suggests a methodology for tests that allows us to determine the temperature dependence of the coefficient of linear thermal expansion (CTE) in a wide range, including the relaxation transition. As measuring equipment was used a dynamic mechanical analyzer TA Instruments Q800 DMA with liquid nitrogen cooling system GCA, which allows varying temperature and its rate of change in wide ranges, controlling and measuring forces and displacements with high accuracy. The proposed approaches are applicable to any film samples and provide an opportunity to establish functional dependences of CTE not only on temperature, but also on its rate of change. At the same time, in contrast to traditional methods, the described procedures allow obtaining correct data under the conditions of relaxation transitions taking into account the influence of the temperature change rate on these processes. Considerable attention is paid to calibrate the measuring equipment, in particular, the measurement and compensation of the temperature deformation of the tooling. The measurements results are compared with known literature sources, manufacturers' data, the results of measurements of samples with known characteristics and with the results obtained on a horizontal dilatometer. It is shown that the proposed method of measurements is correct and has a number of advantages over traditional methods of research when working with film samples or in cases where it is necessary to take the effect of the rate of temperature change on CTE into account.

Keywords

thermal propertiesthermal expansivitycoefficient of thermal expansionglass transitionthermal expansion behaviorpolymer film sample.

ОБ ОДНОМ МЕТОДЕ ИССЛЕДОВАНИЯ КОЭФФИЦИЕНТА ТЕМПЕРАТУРНОГО РАСШИРЕНИЯ ПОЛИМЕРОВ

Рассмотрена проблема исследования деформационного отклика пленочных образцов из УФ-отверждаемых полимеров на изменение температуры, получение массивных образцов из которых затруднительно ввиду особенности их полимеризации. В работе предложена методика натурных испытаний, позволяющая определять температурную зависимость коэффициента линейного температурного расширения (КЛТР) в широком диапазоне, включающем релаксационный переход. В качестве измерительной аппаратуры использован динамический механический анализатор ТА Instruments Q800 DMA с системой охлаждения жидким азотом GCA, который позволяет в широких диапазонах варьировать температуру и скорость ее изменения, с высокой точностью контролировать и измерять усилия и перемещения. Предложенные подходы применимы для любых пленочных образцов, предоставляют возможность устанавливать функциональные зависимости КЛТР не только от температуры, но и от скорости ее изменения. При этом, в отличие от традиционных методов, описанные процедуры позволяют получать корректные данные в условиях протекания релаксационных переходов с учетом влияния на эти процессы скорости изменения температуры. Значительное внимание в работе уделено калибровке измерительной аппаратуры, в частности измерению и компенсации температурной деформации оснастки. Результаты измерений сопоставлены с известными литературными источниками, данными производителей, с результатами измерений образцов с известными характеристиками и с результатами, полученными на горизонтальном дилатометре. Показано, что предложенная методика измерений корректна и обладает рядом преимуществ над традиционными методами исследования при работе с пленочными образцами или в случаях, когда необходимо учитывать влияние на КЛТР скорости изменения температуры.

Ключевые слова

полимерыизмерение КЛТРнатурный эксперименттермическая деформациярелаксационный переходпленки.

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Article information

Published: 17 June 2024
Issue date: 17 June 2024
Issue: No. 2 (2024)