| Partner: Anna Boczkowska |
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Ostatnie publikacje
| 1. | Misiak M.♦, Latko-Durałek P.♦, Fernandez M.♦, Olmedo-Martínez J.♦, Kołbuk-Konieczny D., Górecka Ż.♦, Malmir A.♦, Kozera P.♦, Müller A.♦, Hatzikiriakos S.♦, Boczkowska A.♦, The relationship between thermal, rheological, and tack properties of copolyester-based hot melt adhesives, International Journal of Polymer Analysis and Characterization, ISSN: 1023-666X, DOI: 10.1080/1023666X.2025.2501584, pp.1-20, 2025 Streszczenie: This paper studies the interrelationships between the molecular weight, rheology, crystallinity, and tackiness of three types of commercial thermoplastic hot melt adhesives. The hot melt adhesives employed here differ in their compositions and molecular weights, even though all are copolyesters primarily based on poly(butylene terephthalate). Differences in the composition were found to influence the adhesives’ crystallization and melting behavior. These structural variations can translate into different thermal responses and processing characteristics relevant for tailoring adhesive selection to application requirements. Furthermore, adhesives with higher molecular weight were observed to possess larger elasticity, leading to significantly enhanced tackiness properties, as evidenced by the higher values of tensile modulus, peak stress, and work of debonding. This elevated tackiness was linked to the increased fibrillation process observed in polymers with higher molecular weights. Additionally, all tested adhesives exhibited storage moduli below the Dahlquist threshold (G′ < 3.3 × 105 Pa), which supports their ability to achieve measurable tackiness during the initial bonding process. The results presented in this study underscore the diversity among hot melt adhesives and the critical properties that should be considered when selecting adhesives for specific applications. Słowa kluczowe: Hot melt adhesives, copolyester, polybutylene terephthalate, tack properties, rheology, crystallinity Afiliacje autorów:
|  | 70p. | |||||||||||||||||||||||||||||||||
| 2. | Szmidt T., Pisarski D., Konowrocki R., Awietjan S.♦, Boczkowska A.♦, Adaptive damping of a double-beam structure based on magnetorheological elastomer, SHOCK AND VIBRATION, ISSN: 1070-9622, DOI: 10.1155/2019/8526179, Vol.2019, pp.8526179-1-16, 2019 Streszczenie: A method of vibration reduction based on activation of an MRE block that couples twin cantilever beams at their free ends is investigated. Four types of magnetorheological elastomers have been manufactured, and their rheological properties in a range of magnetic field intensities are established. Free vibrations of several double-beam structures with controllable damping members made of these MREs are investigated, and a method of semiactive control of such structures is proposed. The effects of compression of the elastomers and alignment of the magnets used to activate them are reported. The mathematical modeling of the system is verified experimentally. Afiliacje autorów:
| | 70p. | |||||||||||||||||||||||||||||||||
| 3. | Latko P.♦, Kołbuk D., Kozera R.♦, Boczkowska A.♦, Microstructural Characterization and Mechanical Properties of PA11 Nanocomposite Fibers, Journal of Materials Engineering and Performance, ISSN: 1059-9495, DOI: 10.1007/s11665-015-1817-2, Vol.25, No.1, pp.68-75, 2016 Streszczenie: Polyamide 11/multi-walled carbon nanotubes nanocomposite fibers with weight fraction 2, 4, and 6 wt.% and diameter 80 μm were prepared with a twin screw mini-extruder. The morphology and degree of dispersion of the multi-walled carbon nanotubes in the fibers was investigated by using scanning and transmission electron microscopy. In turn, the molecular structure was indicated by using wide-angle x-ray scattering and correlated with thermal analysis. It was found that carbon nanotubes lead to the formation of α phase in the fibers and they show medial level of alignment within the length of the fiber. Mechanical analysis of the fibers shows that apart from the crystallinity content, the tensile strength is strongly dependent on the macroscopic defects of the surface of the fibers. Nanocomposite fibers based on polyamide 11 with carbon nanotubes can be used as a precursor for non-woven or woven fabrics manufacturing process. Słowa kluczowe: aerospace, electron microscopy, nanomaterials, thermal analysis, x-ray Afiliacje autorów:
| | 20p. |