Search results for " Critic"

Microstructure analysis of biocompatible phosphoester copolymers

2013

Copolymers with varying compositions of 2-ethoxy-2-oxo-1,3,2-dioxaphospholane (EEP) and 2-ethoxy-4-methyl-2-oxo-1,3,2-dioxaphospholane (EMEP) have been synthesized via 1,5,7-triazabicyclo[4.4.0]dec-5-ene-catalyzed anionic ring-opening polymerization. The molecular weights and comonomer ratios were well controlled and polymers with reasonable molecular weight distributions (<1.5) were obtained in all cases. The copolymers were investigated by 1H and 31P NMR spectroscopies to determine the underlying microstructure via detailed dyad analysis. The copolymers were found to be nontoxic to HeLa cells. Furthermore, the obtained copolymers of EEP and EMEP show thermoresponsive properties, i.e., exh…

Phase Behavior of the System Linear Polyglycerol + Methanol + Carbon Dioxide

2011

To compare the phase behavior of linear and hyperbranched polymers, the phase envelopes of the ternary system linear polyglycerol + methanol + carbon dioxide were determined for polymers of varying molar mass. Phase changes were detected by a static synthetic method using the Cailletet setup for temperatures between 331 K and 421 K and pressures up to 13.1 MPa. Besides the vapor–liquid and liquid–liquid equilibria, also the vapor–liquid to vapor–liquid–liquid and vapor–liquid–liquid to liquid–liquid phase boundaries are reported. The experimental results are similar to systems with hyperbranched polymers (rather than linear polymers). For the systems with linear polymers, however, the bubbl…

Interrelation between the thermodynamic and viscometric behaviour of aqueous solutions of hydrophobically modified ethyl hydroxyethyl cellulose

2000

Abstract Aqueous solutions of a commercial sample of hydrophobically modified ethyl hydroxyethyl cellulose (HC, Mw=100 kg/mol, nonylphenol substitution ca. 1.7 mol%) were studied with respect to their demixing behaviour and flow characteristics. Phase separation temperatures were measured turbidimetrically and by determining the first discernible macroscopic phase separation. In some cases demixing was also monitored viscometrically. Phase volume ratios yielded a critical polymer concentration of 1.87 wt.% HC (displaced considerably out of the minimum of the demixing curve towards higher polymer concentrations) and a lower critical solution temperature of 47°C. Model calculations of the spi…

Biocompatible Poly(N-isopropylacrylamide)-halloysite Nanotubes for Thermoresponsive Curcumin Release

2015

The grafting of poly(N-isopropylacrylamide) (PNIPAAM) onto the halloysite external surface is proposed in order to obtain a novel thermoresponsive drug carrier for curcumin delivery. The new nanomaterial is characterized by means of FT-IR spectroscopy, thermogravimetric analysis, and SEM investigations. A high density of polymer chain was achieved at the nanoparticle surface. The PNIPAAM dehydration phenomenon was observed in water above 32 °C that is nearly coincident with the lower critical solution temperature for the polymer. The colloidal stability as well as the wettability of the obtained nanomaterial may be triggered by temperature stimuli. In vitro tests simulating the gastro-intes…

Thermoresponsive hyperbranched polyethylenimines with isobutyramide functional groups

2007

Una mostra per l’arte in Sicilia nell’età dei Chiaromonte

2020

The essay examines the museum itinerary of the exhibition on Chiaromonte set up at the Steri in Palermo between the end of 2019 and the beginning of 2020, studying the most significant works and framing them in the historical-artistic context of the 14th century in Sicily, Italy and Europe.

Approccio terapeutico alla claudicatio intermittens e all'ischemia critica.

2007

Geografie letterarie senza frontiere

2016

L’esperienza della ‘de-localizzazione’ trova nella scrittura un fecondo luogo di espressione delle istanze più variegate del complesso problema dell’‘incontro con l’altro’, che è d’obbligo oggi indagare nella prospettiva di trovare una dimensione ‘terza’, intersoggettiva, in cui si ingenera la necessità – non sempre soddisfatta – della rinuncia alla esclusiva proiezione del sé. La Letteratura dell’erranza è, allora, il luogo privilegiato per la rielaborazione e la ricostruzione, a partire proprio dalla distanza, di quella memoria storica che, se letta in chiave di discorso plurale, è capace di restituire. Consapevoli della vastità e della estrema variegatura dei temi e dei problemi storico-…

The third party embedded. Clients of artworks for public venues in Renaissance Venice

2011

The third party seen as a category of analysis for the client-artist relationship in Renaissance Venice.

Conrad Under Polish Eyes - or: is Conrad still "one of us"?

2015

This article discusses the attitude of Polish Conrad scholars towards Conrad and his works from the very beginning of his literary career to the present day, discussing the way they have perceived Conrad’s national identity and his cultural belonging. Although I aim to present a review of Polish criticism over the years, I pay particular attention to modern criticism, i.e. that of the period since the end of the Second World War, which includes the years of de facto communist rule (1945-1989). I try to determine whether Conrad is still “one of us”, whether he can be perceived as a moralist in the twenty-fi rst century and whether there is a need for such a moralist in present-day Poland.