PHOTOCHEMICAL DEGRADATION OF POLYMERS CONTAINING URETHANE GROUPS IN THE SOLID PHASE: INFLUENCE OFSBLOCK CATIONS ON THE DEGRADATION

Autor:	Aurelian Florin Popa, Mihail Liviu Craus, Alexandra Raluca Iordan, Constantin Ciobanu, Mircea-Nicolae Palamaru, Alexandru Cecal
Rok vydání:	2004
Předmět:	chemistry.chemical_classification Materials science Polymers and Plastics General Chemical Engineering Polymer Photochemistry Polyelectrolyte Analytical Chemistry Metal chemistry visual_art Phase (matter) Polymer chemistry Ultraviolet light visual_art.visual_art_medium Molecule Irradiation Elastic modulus
Zdroj:	International Journal of Polymeric Materials. 53:157-172
ISSN:	1563-535X 0091-4037
DOI:	10.1080/00914030490267573
Popis:	Modification of the physico-mechanical properties of films made of biologically compatible polymers, with urethane groups, complexed with metallic ions from the s-block (Soft Block), have been investigated according to cation nature and photochemical irradiation time. Strain at the break, remnant elongation, elasticity modulus and resistance at the break were the main physico-mechanical properties measured. Experiments were carried out by irradiation with ultraviolet light, on solid film, under condition of accentuated degradation. Ions of both alkaline metals and alkaline-earth metals in the first step of irradiation improve the physico-mechanical properties. But in the middle of the investigated range they strongly decrease, concomitantly with the appearance of some deep photochemical induced structural modifications in the structure of the investigated polyesterurethane.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::6b43c27791a7dcda93265b5ecab37768 https://doi.org/10.1080/00914030490267573 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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