ewa spasowka - Academia.edu (original) (raw)

Papers by ewa spasowka

Polymers

Potato thermoplastic starch (TPS) containing 1 wt.% of pure halloysite (HNT), glycerol-modified h... more Potato thermoplastic starch (TPS) containing 1 wt.% of pure halloysite (HNT), glycerol-modified halloysite (G-HNT) or polyester plasticizer-modified halloysite (PP-HNT) was prepared by melt-extrusion. Halloysites were characterized by FTIR, SEM, TGA, and DSC. Interactions between TPS and halloysites were studied by FTIR, SEM, and DMTA. The Vicat softening temperature, tensile, and flexural properties were also determined. FTIR proved the interactions between halloysite and the organic compound as well as between starch, plasticizers and halloysites. Pure HNT had the best thermal stability, but PP-HNT showed better thermal stability than G-HNT. The addition of HNT and G-HNT improved the TPS’s thermal stability, as evidenced by significantly higher T5%. Modified TPS showed higher a Vicat softening point, suggesting better hot water resistance. Halloysite improved TPS stiffness due to higher storage modulus. However, TPS/PP-HNT had the lowest stiffness, and TPS/HNT the highest. Halloys...

INŻYNIERIA MATERIAŁOWA, 2020

Advances in Materials Science and Engineering, 2018

The effect of plasticizer (polydimethylsiloxanol) and neat (SiO2) or modified (having amine funct... more The effect of plasticizer (polydimethylsiloxanol) and neat (SiO2) or modified (having amine functional groups) silica (A-SiO2) on morphology, thermal, mechanical, and rheological properties of PLA/TPS blends compatibilized by maleated PLA (MPLA) was investigated. Toughened PLA/MPLA/TPS (60/10/30) blend containing 3 wt.% of plasticizer and various contents (1, 3, or 5 wt.%) of silica were prepared in a corotating twin-screw extruder. From SEM, it is clear that plasticized PLA/MPLA/TPS blend continuous porous structure is highly related to the silica content and its functionality. The results indicate that polydimethylsiloxanol enhances ductility and the initial thermal stability of the plasticized blend. DSC and DMTA analyses show that nucleation ability and reinforcing effect of A-SiO2on plasticized blend crystallization are much better than those of SiO2. Silica practically had no effect on the thermo-oxidative degradation. However, the composites with A-SiO2had better thermal stab...

Journal of Renewable Materials, 2018

Poly(phenylene oxide)/renewable polyamide 11 (PPO/PA11 20/80) blends toughened with glycidyl meth... more Poly(phenylene oxide)/renewable polyamide 11 (PPO/PA11 20/80) blends toughened with glycidyl methacrylate grafted ethylene-n-octene copolymer (GEOC) were prepared in a co-rotating twin-screw extruder. The reaction between GEOC and PPO/PA11 blend was analyzed by gel content tests. The morphology of PPO/PA11/GEOC blends was observed by scanning electron microscope. The SEM results showed that PPO formed the continuous phase, though it is a minority component of blends. With increasing GEOC content from 5 to 15 wt% the morphology of the blends transformed from droplet-matrix to co-continuous structure, in which both PA11 and PPO phases are continuous. The blend with co-continuous morphology had better mechanical properties than those with droplet-matrix morphology. The impact strength of the PPO/PA11/GEOC blends was much higher compared to the one without GEOC as well as PA11 due to the compatibilizing effect, which was also proved by DSC analysis, rheological behavior (MFR, DMTA) and tensile properties.

Journal of Biobased Materials and Bioenergy, 2013

Polimery, 2006

A literature review (83 references) concerning the methods of synthesis of the biodegradable poly... more A literature review (83 references) concerning the methods of synthesis of the biodegradable polymer nanocomposites, based on inorganic nanofillers or cellulose, gelatin, chitosan, poly(lactic acid) (PLA), poly(hydroxybutyric acid) (PHB), poly(butylene succinate) (PBS), poly(e-caprolactone) (PCL) or aliphatic polyesters, was done. The mechanism of polymer interaction with layered nanofillers was presented using montmorillonite as an example (Fig. 1-3, Table 1). The methods of blending in melt or solution, co-precipitation processes, in-situ polymerizaton, sol-gel technique as well as unconventional methods, mainly High-Energy Ball Milling (HEBM), were described.

Polimery

Biodegradowalne nanokompozyty polimerowe CZ. I. METODY OTRZYMYWANIA Streszczenie-Dokonano przegl¹... more Biodegradowalne nanokompozyty polimerowe CZ. I. METODY OTRZYMYWANIA Streszczenie-Dokonano przegl¹du literatury dotycz¹cej metod otrzymywania biodegradowalnych nanokompozytów polimerowych na podstawie nanonape³niaczy nieorganicznych oraz skrobi, celulozy, ¿elatyny, chitozanu, poli(kwasu mlekowego) (PLA), poli(kwasu hydroksymas³owego) (PHB), poli(bursztynianu butylenu) (PBS), poli(kaprolaktonu) (PCL) lub poliestrów alifatycznych. Na przyk³adzie montmorylonitu przedstawiono mechanizm wspó³oddzia³ywania polimerów z warstwowymi nanonape³niaczami. Omówiono metody mieszania tych sk³adników nanokompozytów w stanie stopionym b¹dŸ w roztworze, procesy wspó³str¹cania, polimeryzacjê in situ, technikê zol-¿el oraz sposoby niekonwencjonalne, przede wszystkim wysokoenergetyczne rozdrabnianie (HEBM). S³owa kluczowe: polimery biodegradowalne, nieorganiczne nanonape³niacze, montmorylonit, nanokompozyty, metody otrzymywania. BIODEGRADABLE POLYMER NANOCOMPOSITES. PART I. METHODS OF PREPARATION Summary-A literature review (83 references) concerning the methods of synthesis of the biodegradable polymer nanocomposites, based on inorganic nanofillers or cellulose, gelatin, chitosan, poly(lactic acid) (PLA), poly(hydroxybutyric acid) (PHB), poly(butylene succinate) (PBS), poly(ε-caprolactone) (PCL) or aliphatic polyesters, was done. The mechanism of polymer interaction with layered nanofillers was presented using montmorillonite as an example (Fig. 1-3, Table 1). The methods of blending in melt or solution, co-precipitation processes, in-situ polymerizaton, sol-gel technique as well as unconventional methods, mainly High-Energy Ball Milling (HEBM), were described.

Polymers for Advanced Technologies, 2012