Summary: This study aimed at investigating into possible applications of polyhedral oligomeric silsesquioxanes (POSS) as fillers of epoxy elastomers. Detailed studies were carried out for octakis [(3-glycidyloxypropyl) dimethylosiloxy] octasilsesquioxane (POSS-OG). The elastic epoxy materials consisted of diglycidyl ethers of 1,4-butanediol or 1,6-hexanediol, crosslinked with polyoxypropylenediamine Jeffamine D2000. The results obtained by differential scanning calorimetry (DSC), dynamic mechanical thermal analysis (DMA), and rheological measurements made it possible to establish the effect of POSS-OG modifier on the properties of the material. The silsesquioxane modifier was found to enhance the elasticity of the resulting polymers and reduced gelation time.

In this article the effect of type and content of fractions of recycled glass fiber reinforced plastics (GFRP) on the mechanical properties and flame resistance of epoxy composites (EP) were investi gated. For this purpose, postproduction waste of glass fabric reinforced laminate with epoxy matrix containing 15 wt % of aluminum diethylphosphinate (AlDPi), 10 wt % of melamine polyphosphate (MPP) and 15 wt % of zinc borate (ZB) was ground and sieved to obtain four fractions of grain size: >1 mm (A), 1-0.5 mm (B), 0.25-0.5 mm (C) and <0.25 mm (D). The two smallest fractions (C, D) were used to prepare epoxy composites containing 10, 15 and 20 wt % of waste. The mechanical properties and fire resistance of obtained composites aimed as structural elements of seat equipment in public transport were determined. Scanning electron microscopy (SEM) was also performed to investigate the morphology of brittle fractures of epoxy composites. It was found that the amount and type of recyclated GFRP fraction affects the functional properties of powderepoxy resin composites. The best results were obtained for the composite containing 15 wt % of the smallest fraction (D), as all mechanical properties were significantly improved [hardness 147.6 N/mm 2 (+42.5%), impact strength 9.64 kJ/m 2 (+11%), Young's modulus 2.98 GPa (+41.5%), tensile strength 51.5 MPa (+37%) and flexural strength 98.7 MPa (+10.9%)]. On the other hand, significant decrease in mechanical properties was observed for the composite containing 20 wt % of the fractions with grain size 0.5-0.25 mm (C). The analysis of the brittle fractions morphology of composites, indicates the weak dispersion and agglomerates formation in the case of composites with coarsegrained fractions. This also contributed to the flammability results. The highest flame resistance was found in the composite with 20 wt % of the finegrained fraction: limiting oxygen index LOI = 26.1% instead of 20.6%-EP, peak of heat release rate pHRR = 540.3 kW/m 2 instead of 940.1 kW/m 2-EP.

Sieciowanie ¿ywicy epoksydowej Epidian ® 6 zawieraj¹cej reaktywny nape³niacz krzemoorganiczny -analiza metod¹ ró¿nicowej kalorymetrii skaningowejStreszczenie -Metod¹ ró¿nicowej kalorymetrii skaningowej (DSC) badano przebieg reakcji sieciowania ¿ywicy epoksydowej Epidian 6 (E6), z dodatkiem lub bez reaktywnego nape³niacza, oktakis [(3-glicydoksypropylo)dimetylosiloksy]oktasilseskwioksanu (POSS-OG). Utwardzaczem by³ 4,4'-diaminodifenylometan (DDM). Na podstawie analizy termogramów zarejestrowanych w warunkach ró¿nych szybkooeci ogrzewania, przy u¿yciu "metody bezmodelowej" (Model Free Kinetics), okreoelono tak¿e kinetykê reakcji utwardzania badanych uk³adów. Dane uzyskane z izotermicznych analiz DSC, wykonanych w zakresie temperatury 60-160 °C, z modulacj¹ temperatury TOPEM ® , wykorzystano natomiast do wyznaczenia przebiegu diagramów TTT (time-temperature-transformation) kompozycji ¿ywicy Epidian 6 bez i z dodatkiem POSS-OG. S³owa kluczowe: ¿ywice epoksydowe, silseskwioksany, reakcja sieciowania, diagram TTT. CURING OF EPOXY RESIN EPIDIAN ® 6 CONTAINING REACTIVE ORGANOSILICON FILLER -A DIFFERENTIAL SCANNING CALORIMETRY STUDYSummary -The curing reaction of epoxy resin Epidian 6 with or without an addition of reactive filler, octakis-[(3-glycidoxypropyl)dimethylsiloxy]octasilsesquioxane (POSS-OG), was investigated using differential scanning calorimetry (DSC). The curing agent was 4,4'-diaminodiphenylmethane (DDM). Based on the analysis of the thermograms recorded at different heating rates the kinetics of curing reactions in the examined systems was determined using the Model Free Kinetics method. The experimental results obtained by DSC isothermal analysis in the temperature range 60-160 °C, with temperature modulation TOPEM ® , were used to construct TTT (time-temperature-transformation) diagram for epoxy resin Epidian 6 compositions with or without POSS-OG.

The aim of the research was to analyze consumer behavior regarding changes in the place where the food was purchased during the COVID-19 pandemic. An analysis of the relationship between sociodemographic characteristics and changes in the frequency of food purchases in specified retail outlets was presented. Different consumer reactions to the threats and restrictions that resulted from the COVID-19 pandemic were found. Gender had a statistically significant impact on the changes in the place of purchase in the case of supermarkets and discount stores. Women were reported to be more cautious about the risks associated with shopping in supermarkets and discount stores. Age had a statistically significant impact on the frequency of grocery shopping in small local/rural stores, in medium-sized self-service stores, in supermarkets and in discount stores. Among the group of respondents aged 46 and over, greater trust in larger commercial units was observed. Education had a statistically significant impact on the frequency of shopping for groceries only in supermarkets. In turn, the place of residence had a statistically significant impact on the change in the frequency of making purchases in medium-sized self-service stores and discount stores. The results of our own research are not unambiguous, but they indicate certain tendencies in the perception of health safety when shopping among various social groups.