Polystyrene-Based Nanocomposites with Different Fillers: Fabrication and Mechanical Properties

Abstract

The paper presents a comprehensive analysis of the elastic properties of polystyrene-based nanocomposites filled with different types of inclusions: small spherical particles (SiO2 and Al2O3), alumosilicates (montmorillonite, halloysite natural tubules and mica), and carbon nanofillers (carbon black and multi-walled carbon nanotubes). Block samples of composites with different filler concentrations were fabricated by melt technology, and their linear and non-linear elastic properties were studied. The introduction of more rigid particles led to a more profound increase in the elastic modulus of a composite, with the highest rise of about 80% obtained with carbon fillers. Non-linear elastic moduli of composites were shown to be more sensitive to addition of filler particles to the polymer matrix than linear ones. A non-linearity modulus βs comprising the combination of linear and non-linear elastic moduli of a material demonstrated considerable changes correlating with those of the Young’s modulus. The changes in non-linear elasticity of fabricated composites were compared with parameters of bulk non-linear strain waves propagating in them. Variations of wave velocity and decay decrement correlated with the observed enhancement of materials’ non-linearity.

Frequency Dependence of Nonlinear Elastic Moduli of Polystyrene‐Based Nanocomposites in the Range of 1.5–2.5 MHz

“…The chosen filler concentrations were previously shown to provide most essential changes of linear elastic properties without significant agglomeration of filler particles. The samples were fabricated by melt technology (see [ 5 ] for fabrication details) in the form of plates of the size 1 × 10 × 50 mm 3 . To increase measurement accuracy by increasing the contact area of the sample and piezoelectric transducers three plates of each material were glued together by the ethylcyanoacrylate adhesive Supermoment.…”

Relative variations of nonlinear elastic moduli in polystyrene-based nanocomposites

“…Spherical particles, SiO 2 and CB, were introduced to the PS-matrix at the concentrations of up to 20% weight and halloysite tubules of up to 10% weight. The chosen filler concentrations were shown to provide the most essential changes of linear elastic properties without significant agglomeration [32].…”

Определение Модулей Упругости Третьего Порядка В Образцах Полистирола, Изготовленных По Разным Технологиям

“…Затем проводилось впрыскивание расплава полимера в прессформу, нагретую до 80 • С. Далее пресс-форма охлаждалась до комнатной температуры на воздухе. Более детально технология изготовления описана в работе [19]. Вторая часть образцов (обозначены как PS lab2 ) получалась переработкой полистирола при 280 • С в течение 10 min и скорости вращения шнеков ω = 120 min −1 с последующим литьем в пресс-форму, нагретую до 40 • С. Затем образец вынимался из прессформы.…”

“…Кроме того, эти результаты являются обоснованием возможности проведения исследований распространения объемных нелинейных волн деформации в ламинированных волноводах, выполненных из полистирола и нанокомпозитов на его основе (см. [19][20][21][22]).…”