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Wpływ dodatku mikroproszków węglika krzemu (SiC) i węglika wolframu (WC) na termiczno-dynamiczne właściwości mechaniczne oraz temperaturę zeszklenia epoksydowych kompozytów ablacyjnych

Kucharczyk Wojciech, Bogucki Marcin, Stawarz Sylwester, Samociuk Waldemar, Białkowska Anita, Struž Jiří, Krzysiak Zbigniew

Przemysł Chemiczny

2024

T. 103, nr 6

677--682

Zbadano termiczno-dynamiczne właściwości mechaniczne dwóch rodzajów kompozytów epoksydowych (na bazie żywicy Epidian 52 utwardzanej trietylenotetraaminą i żywicy Epidian 112 utwardzanej poliaminoamidem) modyfikowanych różną zawartością cząstek węgliku krzemu SiC i węgliku wolframu WC (10-56% każdej frakcji wagowej proszku w kompozycie). Ustalono wpływ składników na właściwości kompozytów. Przedstawiono typowe struktury SEM badanych próbek.

Two types of epoxy resin-based composites filled with different contents of SiC and WC microparticles (10-56% of each powder mass fraction in the composite) were tested by dynamic-thermal analysis (DMA). The tests were performed using 2 bending modes. Based on the temp. characteristics of the DMA-tested materials, such as storage modulus, loss modulus and damping coeff., the glass transition temp. range was detd. Typical SEM structures of the studied samples were shown.

Synergistic toughening and strengthening of an epoxy resin modified by simultaneous use of two different modifiers

Białkowska Anita, Suroń Patryk, Kucharczyk Wojciech, Hanulikova Barbora, Bakar Mohamed

Bulletin of the Polish Academy of Sciences. Technical Sciences

2024

Vol. 72, nr 3

art. no. e149176

The present work investigates the effect of modifying an epoxy resin using two different modifiers. The mechanical and thermal properties were evaluated as a function of modifier type and content. The structure and morphology were also analyzed and related to the measured properties. Polyurethane (PUR) was used as a liquid modifier, while Cloisite Na+ and Nanomer I.28E are solid nanoparticles. Impact strength (IS) of hybrid nanocomposites based on 3.5 wt% PUR and 2 wt% Cloisite or 3.5 wt% PUR and 1 wt% Nanomer was maximally increased by 55% and 30%, respectively, as compared to the virgin epoxy matrix, exceeding that of the two epoxy/nanoparticle binaries but not that of the epoxy/PUR binary. Furthermore, a maximum increase in IS of approximately 20% as compared to the pristine matrix was obtained with the hybrid epoxy nanocomposite containing 0.5 wt% Cloisite and 1 wt% Nanomer, including a synergistic effect, due most likely to specific interactions between the nanoparticles and the epoxy matrix. The addition of polyurethane and nanoclays increased the thermal stability of epoxy composites significantly. However, DSC results showed that the addition of flexible polyurethane chains decreased the glass transition temperatures, while the softening point and the service temperature range of epoxy nanocomposites containing nanofillers were increased. FTIR analysis confirmed the occurrence of interaction between the epoxy matrix and added modifiers. All SEM micrographs showed significant roughness of the fracture surfaces with the formation of elongated platelets, explaining the increase in mechanical properties of the epoxy matrix.

New Polymer Composites Including a Phenol-Formaldehyde Resin Binder Designed for Self-Lubricating Sliding Pair Elements

Stawarz Sylwester, Stawarz Magdalena, Kucharczyk Wojciech, Żurowski Wojciech, Różycka Agnieszka

Advances in Science and Technology. Research Journal

2019

Vol. 13, no 4

223--229

he paper presents the test results of composites used in self-lubricating sliding pairs where resol phenol-formaldehyde (AW-1, FDP), novolak phenol-formaldehyde, and anthracene-phenol resins were applied as binders. Thermal resistance, load capacity, friction resistances, wear values, and formation of top layers of friction-coupled elements were studied. A model composite with 9 MPa×m/s load capacity and friction wear resistance greater than of the composites available in the domestic and international markets, comparable friction resistances, and lower production costs was developed.