Viscometric Study of Segmented Poly(ester-urethane) Solutions in Dilute and Extremely Dilute Concentration Domains

Ioan, Silvia; Lupu, Mihaela; Taranu, Anca; Macocinschi, Doina

doi:10.1080/00914030490499071

Cited by 4 publications

(3 citation statements)

References 40 publications

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“…The samples containing segmented block copolyurethanes were prepared by the reaction of aromatic diisocyanates, such as 4,4′‐methylene diphenylene diisocyanate (MDI) or 2,4‐tolylene diisocyanate (TDI), with poly(ethylene glycol)adipate (PEGA), poly(propylene glycol) (PPG) or polytetrahydrofurane (PTHF) and 4,4′‐dihydroxydiethoxydiphenyl sulfone (DEDS), thiodiglycol (TDG) or diethylene glycol (DEG) as chain extenders, by applying a two step polyaddition process in N , N ‐dimethylformamide (DMF) 2, 16–19…”

Section: Methodsmentioning

confidence: 99%

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Macromolecular assemblies of segmented poly(ester urethane)s and poly(ether urethane)s

Ioan¹,

Lupu²,

Epure³

et al. 2007

J of Applied Polymer Sci

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Polyurethanes containing different soft and hard segments were investigated by fluorescence and scanning electron microscopy. The polarity dependence of the vibrational structure of the pyrene emission spectrum indicated the formation of aggregates at concentrations, which are significantly below the critical concentrations, which define the separation of dilute-semidilute domains. Unlike the samples with 4,4 0 -methylene diphenylene diisocyanate, the samples with 2,4-tolylene diisocyanate in hard segments give the fluorescence spectra in which the pyrene excimer appears. The supermolecular structures associated with the form of spherulites or of spherical micelles were detected by scanning electron microscopy. The results were compared with previous reports concerning viscometric data.

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Section: Methodsmentioning

confidence: 99%

“…Previous publications in the field12–19 presented the syntheses and some properties of a new series of segmented and crosslinked polyurethanes. The influence of polymer structure on thermal stability, the behavior in different organic solvents, the structure and morphology of these compounds were analyzed.…”

Section: Introductionmentioning

confidence: 99%

Macromolecular assemblies of segmented poly(ester urethane)s and poly(ether urethane)s

Ioan¹,

Lupu²,

Epure³

et al. 2007

J of Applied Polymer Sci

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“…Our previous publications23–30 presented the synthesis and some properties of a series of new segmented and crosslinked polyurethanes. The influence of polymer structure on thermal stability, the behaviour in different organic solvents and the structure and morphology of these compounds were analysed.…”

Section: Introductionmentioning

confidence: 99%

Surface tension of poly(ester urethane)s and poly(ether urethane)s

Lupu¹,

Macocinschi²,

Ioanid³

et al. 2006

Polymer International

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The correlation between the surface tension parameters and the chemical composition of poly(ester urethane) and poly(ether urethane) thin films with different soft and hard segments, both before and after plasma treatment, was investigated. Calculations are based on the geometric mean approach of Owens and Wendt (Owens DK and Wendt RC, J Appl Polym Sci 13:1741 (1969)), Rabel (Rabel W, Physikalische Blätter 33:151 (1977)) and Kälble (Kälble DH, J Adhesion 1:102 (1969)), on the Lifshitz-van der Waals acid/base approach of van Oss and co-workers (van Oss CJ, Good RJ and Chaudhury MK, Langmuir 4:884 (1988); van Oss CJ, Ju L, Chaudhury MK and Good RJ, Chem Rev 88:927 (1988); van Oss CJ, Interfacial Forces in Aqueous Media. Marcel Dekker, New York (1994)) and on the theoretical methods involving quantitative structure-property relationships (Bicerano J, JMS Rev Macromol Chem Phys C36:161 (1996)). For all investigated films, the polar terms contribute significantly to the total surface tensions, as due to the large electron donor, γ − sv , interactions. Plasma treatment alters the surface energy of samples by changing their surface polarity and hydrophilicity. The hydrophilicity trends for polyurethanes were also studied by means of the free energy of hydration between compounds and water. Preliminary blood contact tests of the selected polyurethane sample with higher hydrophilicity were developed for biomedical applications.Surface tension of poly(ester urethane)s and poly(ether urethane)s

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