Zobrazeno 1 - 10
of 16
pro vyhledávání: '"Justyna Krajenta"'
Autor:
Andrzej Pawlak, Justyna Krajenta
Publikováno v:
Molecules, Vol 29, Iss 14, p 3410 (2024)
Flexible macromolecules easily become entangled with neighboring macromolecules. The resulting network determines many polymer properties, including rheological and mechanical properties. Therefore, a number of experimental and modeling studies were
Externí odkaz:
https://doaj.org/article/dfe1c9870c9a472f91cbd426337bb563
Publikováno v:
eXPRESS Polymer Letters, Vol 17, Iss 7, Pp 738-758 (2023)
The influence of the reduction of macromolecular entanglements on the thermal and mechanical properties of polylactide composites containing 0.1–1.0 wt% of carbon nanotubes was investigated. Partial disentangling of the macromolecules improved the
Externí odkaz:
https://doaj.org/article/434ae33753cd4f01a9bb0b790f66c430
Autor:
Justyna Krajenta, Andrzej Pawlak
Publikováno v:
Polymers, Vol 16, Iss 12, p 1710 (2024)
The influence of decreasing the entanglement density of macromolecules on the crystallization of the β-form of polypropylene was investigated. Polypropylene with seven times less entanglement was obtained from a solution in xylene, and its propertie
Externí odkaz:
https://doaj.org/article/f9a733c052fd4bdf93e59d85b619a98a
Autor:
Andrzej Pawlak, Justyna Krajenta
Publikováno v:
Journal of Composites Science, Vol 7, Iss 12, p 521 (2023)
Macromolecule entanglements are common in polymers. The first part of this review describes their influence on the properties of entangled polymers. Then, methods for reducing the entanglement density of macromolecule chains are discussed. It has bee
Externí odkaz:
https://doaj.org/article/15dc118006ae4e2dbf0e810e6f2524be
Autor:
Katarzyna Kupińska, Maciej Michalik, Justyna Krajenta, Magda Bielicka, Karolina Halina Markiewicz, Beata Kalska-Szostko, Agnieszka Zofia Wilczewska
Publikováno v:
International Journal of Molecular Sciences, Vol 24, Iss 3, p 2357 (2023)
This study investigated the methods of preparation of zinc oxide-polypropylene nanocomposites and their antibacterial properties. Seven solutions with ZnO nanoparticles or zinc ions were formulated as a PP additive. Two methods of ZnO NPs syntheses w
Externí odkaz:
https://doaj.org/article/e3c05cfdd5714ea987d2bb88df8f5d87
Publikováno v:
Polymer Engineering & Science. 61:1773-1790
Publikováno v:
Polimery. 65:261-267
Publikováno v:
Polimery. 65:167-173
This contribution discusses the preparation of partially disentangled polylactide from solution. The rheological method determined how the density of macromolecular entanglement depends on the concentration of the prepared solution. From a 0.1 wt % s
Publikováno v:
Polymer. 175:215-226
How the reduction of macromolecular entanglements in two polypropylenes affects their rheology and mechanical properties, as well as their isothermal and non-isothermal crystallization has been investigated. In the partially disentangled polymers, lo
Publikováno v:
Polymer. 151:15-26
The mechanical properties of polypropylene samples with three different densities of macromolecular entanglements were examined in tensile test. The experiments were performed at temperatures of 20–100 °C. SAXS, WAXS, DSC and SEM techniques were u