Changes in thermal properties of isotactic polypropylene with different additives during aging process

Brzozowska-Stanuch, A.; Rabiej, Stanisław; Fabia, Janusz; Nowak, Jan

doi:10.14314/polimery.2014.302

Cited by 25 publications

(17 citation statements)

References 3 publications

(3 reference statements)

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“…The next clearly visible peak is an endothermic peak with onset and maximum values at 157 • C and 163 • C, respectively. The enthalpy of this peak is 60.59 J/g, which corresponds to a crystallinity of around 28%, assuming ∆H100% equals 207 J/g [20]. The low degree of crystallinity testifies that the addition of powdered materials such as SAP and Biohaloysite do not result in significant crystallization in the melt-blow processing of PP.…”

Section: Differential Scanning Calorimetrymentioning

confidence: 97%

Multifunctional Polymer Composites Produced by Melt-Blown Technique to Use in Filtering Respiratory Protective Devices

et al. 2020

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In this work, a multifunctional polymer composite is made using melt-blowing technology from polypropylene (88 wt.%) and poly (ethylene terephthalate) (12 wt.%) with the addition of functional modifiers, that is, 3 g of a superabsorbent polymer and 5 g of a biocidal agent (Biohaloysite). The use of modifiers is aimed at obtaining adequate comfort when using the target respiratory protection equipment (RPE) in terms of microclimate in the breathing zone and protection against harmful aerosols including bioaerosols. The developed production method is innovative in that the two powdered modifiers are simultaneously applied in the stream of elementary polymeric fibers by two independent injection systems. Aerosols of the modifiers are supplied via a specially designed channel in the central segment of the die assembly, reducing the amount of materials used in the production process and saving energy. The results show that the proposed method of incorporating additives into the fiber structure did not adversely affect the protective and functional properties of the resulting filtration nonwovens. The produced nonwoven composites are characterized by SEM, FTIR, and differential scanning calorimetry (DSC). Given their high filtration efficiency at 5%, satisfactory airflow resistance (~200 Pa), very good antimicrobial activity, and excellent water absorption capacity, the obtained multifunctional nonwoven composites may be successfully used in filtering respiratory protective devices.

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Section: Differential Scanning Calorimetrymentioning

confidence: 97%

Multifunctional Polymer Composites Produced by Melt-Blown Technique to Use in Filtering Respiratory Protective Devices

et al. 2020

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“…In addition to that, in co-pyrolysis, the drop of temperature occurred in part due to heat absorption by PP melting. Brzozowska-Stanuch et al [41] found that polypropylene has a melting point of 163 • C and it requires heat for melting. Figure 4 shows that there was a large curve bump within the range of about 200-350 °C on biomass spheres.…”

Section: Comparison Of Temperatures Of Biomass Spheres and Pyrolysis mentioning

confidence: 99%

Synergistic Effect on the Non-Oxygenated Fraction of Bio-Oil in Thermal Co-Pyrolysis of Biomass and Polypropylene at Low Heating Rate

2020

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Biomass pyrolysis and polypropylene (PP) pyrolysis in a stirred tank reactor exhibited different heat transfer phenomena whereby heat transfer in biomass pyrolysis was driven predominantly by heat radiation and PP pyrolysis by heat convection. Therefore, co-pyrolysis could exhibit be expected to display various heat transfer phenomena depending on the feed composition. The objective of the present work was to determine how heat transfer, which was affected by feed composition, affected the yield and composition of the non-polar fraction. Analysis of heat transfer phenomena was based on the existence of two regimes in the previous research in which in regime 1 (the range of PP composition in the feeds is 0–40%), mass ejection from biomass particles occurred without biomass particle swelling, while in regime 2 (the range of PP composition in the feeds is 40–100%), mass ejection was preceded by biomass particle swelling. The co-pyrolysis was carried out in a stirred tank reactor with heating rate of 5 °C/min until 500 °C and using N2 gas as carrier gas. Temperature measurement was applied to pyrolysis fluid at the lower part of the reactor and small biomass spheres of 6 mm diameter to simulate heat transfer to biomass particles. The results indicate that in regime 1 convective and radiative heat transfers sparingly occurred and synergistic effect on the yield of non-oxygenated phase increased with increasing convective heat transfer at increasing %PP in feed. On the other hand, in regime 2, convective heat transfer was predominant with decreasing synergistic effect at increasing %PP in feed. The optimum PP composition in feed to reach maximum synergistic effect was 50%. Non-oxygenated phase portion in the reactor leading to the wax formation acted as donor of methyl and hydrogen radicals in the removal of oxygen to improve synergistic effect. Non-oxygenated fraction of bio-oil contained mostly methyl comprising about 53% by mole fraction, while commercial diesel contained mostly methylene comprising about 59% by mole fraction

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“…In previous research, the concentration of metal salts with synthetic polymer blends was varied up to 0.2 wt % as the authors concluded that only small percentage of Transition Metal Stearates (TMS) could alter the mechanical properties and cause thermooxidative degradation in a synthetic plastic . However, there have also been contradictory findings that have explained that only a larger amount of additives will modify the mechanical properties of pure polymers . In this study, PP was blended with metal additives, including cobalt stearate (CoSt 2 ) and iron stearate (FeSt 3 ), at up to 0.9 wt % to form PP–metal additive blends.…”

Section: Introductionmentioning

confidence: 99%

Enhanced degradation properties of polypropylene integrated with iron and cobalt stearates and its synthetic application

Subramaniam

Sharma

Gupta

et al. 2017

J of Applied Polymer Sci

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Synthetic plastic leads to environmental contamination, and a promising solution to this problem is to use prooxidants as fillers within them to speed up the photooxidation and thermooxidation processes. This makes plastics more susceptible to biodegradation. In this study, the degradation properties of the widely used polymer polypropylene (PP) were improved by integration with cobalt stearate (CoSt 2 ) and iron stearate (FeSt 3 ) as prooxidants with accelerating weathering degradation. The metal stearates were blended with PP in the concentration range 0.1-0.9% w/w. The properties of the blends were studied by mechanical properties testing, thermogravimetric analysis, differential scanning calorimetry, and water absorption measurement. We performed the degradation properties and thermooxidative studies by conducting an accelerated weathering test on PP-metal salt blends. Fourier transform infrared spectroscopy and scanning electron microscopy analysis of the samples before and after the accelerated weathering test were performed to study the extent of degradation in PP-based metal salt blends. The results indicate that the tensile strength was inversely proportional to the concentration of metal stearates, and the samples showed an increased degree in polymer crystallinity (PPFe5 > PPCo5), and this led to the degradation of PP in less time. CoSt 2 predominantly enhanced the degradation of PP in comparison to FeSt 3 . Food containers and pots were constructed with the tailored polymers of PP in the injection-molding machine. Thus, metal-stearate-integrated polymers have great industrial potential to generate value-added products.

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Changes in thermal properties of isotactic polypropylene with different additives during aging process

Cited by 25 publications

References 3 publications

Multifunctional Polymer Composites Produced by Melt-Blown Technique to Use in Filtering Respiratory Protective Devices

Multifunctional Polymer Composites Produced by Melt-Blown Technique to Use in Filtering Respiratory Protective Devices

Synergistic Effect on the Non-Oxygenated Fraction of Bio-Oil in Thermal Co-Pyrolysis of Biomass and Polypropylene at Low Heating Rate

Enhanced degradation properties of polypropylene integrated with iron and cobalt stearates and its synthetic application

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