Examination of the Enzyme Resistance of Polyurethane Powder Coatings

Pilch‐Pitera, Barbara

doi:10.1007/s10924-012-0519-1

Cited by 12 publications

(6 citation statements)

References 17 publications

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“…26 No important peaks were obtained by DSC analysis in the studied temperature range (Figure 7), which is explained by the stability of PU below 300°C; because of the low Tg values of PU materials, around 5°C, which is explained by the decomposition of urethane and ether bonds, which results in a lower rigidity of chains. 32 Skin is an organ that responds very quickly to the exposure to an external aggressive agent such as sun radiation and chemical substances. Different immune complexes are generated, circulate in the blood, and they are accumulated on the walls of the small blood vessels located in the skin and the result is a hyperergic (excess) reaction of the local nature; this process is accompanied by the redness of skin.…”

mentioning

confidence: 99%

Synthesis and characterization of a polyurethane carrier used for a prolonged transmembrane transfer of a chili pepper extract

Borcan

Dudás

Len

et al. 2018

IJN

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PurposeRed chili peppers have been highly valued in gastronomy and traditional medicine since ancient times; it seems that it is not just an ingredient for food but also a good remedy for various medical conditions such as increased blood pressure and high levels of serum triglycerides and cholesterol, myocardial infarction, arthritis, and migraines. The objective of this study is the characterization of a new carrier used for encapsulated extract.MethodsChili pepper extract was obtained and was physically entrapped inside polyurethane microparticles in order to diminish the irritative potential of this extract. The particles were evaluated by Zetasizer measurements, small-angle neutron scattering and thermal analysis, scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy; the encapsulation efficacy and the drug release profile were assessed by UV-Vis spectroscopy. Bioevaluations on mice skin were performed to predict the irritative potential of the samples.ResultsTwo different types of samples were compared: hollow polyurethane microparticles vs polyurethane particles containing the natural extract. The sizes of the particles were very similar, but the sample containing the extract presents three particle populations (the polydispersity index increases from 0.3 to 0.6 from one sample to another). The zeta-potential measurements and SEM images indicate a medium tendency to form clusters, while the UV-Vis study revealed an almost 70% encapsulation efficacy.ConclusionThe results suggest that encapsulation of a chili pepper extract inside polyurethane microparticles leads to a non-irritative product with a prolonged release: ~30% of encapsulated extract is released within the first 8 days and a maximum 45% is reached in 2 weeks.

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confidence: 99%

Synthesis and characterization of a polyurethane carrier used for a prolonged transmembrane transfer of a chili pepper extract

Borcan

Dudás

Len

et al. 2018

IJN

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“…Results of the medical approach led to multiple experiments on PU’s degradation being conducted with enzymes like lipases, cholesterol esterase or chymotrypsin [ 81 , 82 , 101 ]. In 2007, Gautam with coworkers proved that commercially available Candida rugosa lipase successfully degraded polyester polyurethane particles.…”

Section: Polyurethane Waste Managementmentioning

confidence: 99%

Polyurethane Recycling and Disposal: Methods and Prospects

2020

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Growing water and land pollution, the possibility of exhaustion of raw materials and resistance of plastics to physical and chemical factors results in increasing importance of synthetic polymers waste recycling, recovery and environmentally friendly ways of disposal. Polyurethanes (PU) are a family of versatile synthetic polymers with highly diverse applications. They are class of polymers derived from the condensation of polyisocyanates and polyalcohols. This paper reports the latest developments in the field of polyurethane disposal, recycling and recovery. Various methods tested and applied in recent years have proven that the processing of PU waste can be economically and ecologically beneficial. At the moment mechanical recycling and glycolysis are the most important ones. Polyurethanes’ biological degradation is highly promising for both post-consumer and postproduction waste. It can also be applied in bioremediation of water and soil contaminated with polyurethanes. Another possibility for biological methods is the synthesis of PU materials sensitive to biological degradation. In conclusion, a high diversity of polyurethane waste types and derivation results in demand for a wide range of methods of processing. Furthermore, already existing ones appear to be enough to state that the elimination of not reprocessed polyurethane waste in the future is possible.

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“…The first assessment of polymer degradation is a naked eye observation, sometimes sufficient to evaluate the degradation onset. Change in color, roughness or shape can be noticed (Pilch-Pitera, 2012). These observations can be completed by surface analysis such as spectroscopy and/or microscopy, polymer molar mass evolution by SEC or modifications of physical properties.…”

Section: Study Of the Degraded Polymers Samples And Insoluble Productsmentioning

confidence: 99%

Evaluation of biological degradation of polyurethanes

Magnin

Pollet

Phalip

et al. 2020

Biotechnology Advances

204

132

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Polyurethanes (PU) are a family of versatile synthetic polymers intended for diverse applications. Biological degradation of PU is a blooming research domain as it contributes to the design of ecofriendly materials sensitive to biodegradation phenomena and the development of green recycling processes. In this field, an increasing number of studies deal with the discovery and characterization of enzymes and microorganisms able to degrade PU chains. The synthesis of short lifespan PU material sensitive to biological degradation is also of growing interest. Measurement of PU degradation can be performed by a wide range of analytical tools depending on the architecture of the materials and the biological entities. Recent developments of these analytical techniques allowed for a better understanding of the mechanisms involved in PU biodegradation. Here, we reviewed the evaluation of biological PU degradation, including the required analytics. Advantages, drawbacks, specific uses, and results of these analytics are largely discussed to provide a critical overview and support future studies.

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Examination of the Enzyme Resistance of Polyurethane Powder Coatings

Cited by 12 publications

References 17 publications

Synthesis and characterization of a polyurethane carrier used for a prolonged transmembrane transfer of a chili pepper extract

Synthesis and characterization of a polyurethane carrier used for a prolonged transmembrane transfer of a chili pepper extract

Polyurethane Recycling and Disposal: Methods and Prospects

Evaluation of biological degradation of polyurethanes

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