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Influence of surface-modified nanoclay on the flexural strength of unsaturated polyester resin

Stępka Dominik

Inżynieria Materiałowa

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2023

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Vol. 44, nr 5

5--10

EN

This study delves into the influence of surface-modified nanoclay on the flexural strength of Unsaturated Polyester Resins (UPRs). UPRs, known for their robust mechanical properties, find extensive applications across various industries. With the aim of further enhancing these properties, nanofillers, specifically surface-modified nanoclay, were incorporated into the resin matrix. Our research revealed a significant improvement in flexural strength with an optimal nanoclay addition of 0.1% by weight. However, the morphological analysis identified the presence of nanoclay agglomerates, indicating potential areas for optimization in the dispersion process. The findings present a promising direction for developing advanced UPR-based materials, emphasizing the pivotal role of nanofillers in achieving superior mechanical performance.

PL

Analizowano wpływ nanoglinki o modyfikowanej powierzchni na wytrzymałość na zginanie nienasyconych żywic poliestrowych (UPR). UPR, znane ze swoich solidnych właściwości mechanicznych, znajdują szerokie zastosowanie w różnych gałęziach przemysłu. W celu dalszej poprawy tych właściwości do matrycy żywicznej wprowadzono nanonapełniacz, a dokładnie nanoglinkę z modyfikowaną powierzchnią. Badania wykazały znaczną poprawę wytrzymałości na zginanie przy optymalnym dodatku nanoglinki w ilości 0,1% mas. Analiza morfologiczna wykazała obecność aglomeratów nanoglinki, wskazując potencjalne obszary optymalizacji w procesie dyspersji. Odkrycia wyznaczają obiecujący kierunek rozwoju zaawansowanych materiałów na bazie UPR, podkreślając kluczową rolę nanonapełniaczy w osiąganiu doskonałych parametrów mechanicznych.

2

Evaluation of properties of polymer-ceramic filaments modified with aluminosilicates for use in 3D printing

Twaróg Rafał, Sendor Michał, Rapacz-Kmita Alicja, Gajek Marcin, Marchewka Jakub, Stodolak-Zych Ewa

Composites Theory and Practice

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2023

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R. 23, nr 1

56--63

EN

A study was conducted on selected nanoclay fillers, i.e. montmorillonite (MMT) or halloysite (HNT) in polylactic acid (PLA) pellets for the manufacture of filaments for 3D printing. A 1-3 weight fraction of the filler was used. In order to compatibilize the nanofiller with the PLA, two methods were employed to facilitate dispersion of the nanoclay particles: using prewetting of the nanoclay in dichloromethane (DCM) and introducing a short-chain plasticizer (polyethylene glycol, PEG200) during the homogenization process. The effectiveness of filler dispersion was verified by performing thermal analysis, i.e. thermogravimetry and differential scanning calorimetry (DG/DSC), as well as by microscopic observations. The processability of the obtained nanocomposite filament was verified for the finished products manufactured from both of the materials by FDM printing. Mechanical strength and impact tests were conducted on the printed samples. The results showed that the prints made from the nanocomposite filaments have better tensile strength (by 25 and 10% for PLA/HNT and PLA/MMT, respectively) compared to prints made from the pure polymer filament.

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Hybrid nanobiocomposites based on poly(3-hydroxybutyrate) : characterization, thermal and mechanical properties

Zarzycka Iwona, Czerniecka-Kubicka Anna, Szyszkowska Agnieszka, Pyda Marek, Frącz Wiesław, Byczyński Łukasz, Sedlarik Vladimir

Acta of Bioengineering and Biomechanics

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2020

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Vol. 22, no. 1

97--110

EN

Poly(3-hydroxybutyrate) is a biopolymer used to production of implants in the human body. On the other hand, the physical and mechanical properties of poly(3-hydroxybutyrate) are compared to the properties of isotactic polypropylene what makes poly(3-hydroxybutyrate) possible substitute for polypropylene. Unfortunately, the melting point of poly(3-hydroxybutyrate) is almost equal to its degradation temperature what gives very narrow window of its processing conditions. Therefore, numerous attempts are being made to improve the poly(3-hydroxybutyrate) properties. In the present work, hybrid nanobiocomposites based on poly(3-hydroxybutyrate) as a matrix with the use of organic nanoclay – Cloisite 30B and linear polyurethane as a second filler have been manufactured. The linear polyurethane was based on diphenylmethane 4,4′-diisocyanate and diol with imidazoquinazoline rings. The obtained nanobiocomposites were characterized by X-ray diffraction, scanning and transmission electron microscopies, thermogravimetry, differential scanning calorimetry and their selected mechanical properties were tested. The resulting hybrid nanobiocomposites have intercalated/exfoliated structure. The nanobiocomposites are characterized by a higher thermal stability and a wider range of processing temperatures compared to the unfilled matrix. The plasticizing influence of nanofillers was also observed. In addition, the mechanical properties of the discussed nanobiocomposites were examined and compared to those of the unfilled poly(3-hydroxybutyrate). The new-obtained nanobiocomposites based on poly(3-hydroxybutyrate) containing 1% Cloisite 30B and 5 wt. % of the linear of polyurethane characterized the highest improvement of processing conditions. They have the biggest difference between the temperature of degradation and the onset melting temperature, about 100 °C.

4

Poly(vinyl chloride)/nanoclay nanocomposites - electrical and mechanical properties

Dimitry O. I., Sayed W. M., Mazroua A. M., Saad A. L.

Polimery

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2009

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T. 54, nr 1

8-14

EN

Poly (vinyl chloride) (PVC) and dioctyl phthalate (DOP) plasticizer were mixed with small amounts (1-10phr) of a layered silicate nanoclay consisting of 83.3% of montmorillonite and 16.7% of kaolinite to obtain PVC-based nanocomposites. The thermalstability of obtained products was characterized by thermal analysis using a thermogravimetric analyzer (TGA). The electrical conductivity of these composites was studied as a function of temperature and it was found that the activation energy for this property is lower than that of the host polymer. The composites exhibit increased Young's modulus and decreased Shore A hardness.

PL

Otrzymano nanokompozyty plastyfikowany poli(chlorek winylu)/nanoglinka (83,3% montmorylonitu + 16,7% kaolinitu) różniące się zawartością napełniacza (1-10phr w przeliczeniu na PVC, tabela 1). Metodą TGA zbadano stabilność termiczną uzyskanych produktów, które do temp. 100°C nie wykazują ubytku masy (rys. 1-3). Scharakteryzowano też ich właściwości dielektryczne (rys. 4 i 5) oraz zależność przewodności właściwej od zawartości nanoglinki i od temperatury (rys. 6-8, tabela 3). Na podstawie tej drugiej zależności obliczano energię aktywacji przewodnictwa nanokompozytów (tabela 3) stwierdzając, że są one pod tym względem zbliżone do półprzewodników. Zbadano też właściwości mechaniczne przy rozciąganiu oraz twardość omawianych produktów (tabela 4).