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Polyurethane synthesis, wherein the urethane groups −NH−(C=O)−O− link the molecular units A kitchen sponge made of polyurethane foam . Polyurethane (/ ˌ p ɒ l i ˈ jʊər ə ˌ θ eɪ n,-j ʊəˈr ɛ θ eɪ n /; [1] often abbreviated PUR and PU) refers to a class of polymers composed of organic units joined by carbamate (urethane) links.
The term rug was first used in English in the 1550s, with the meaning 'coarse fabric'. The term is of Scandinavian origin, comparable to Norwegian rugga 'coarse coverlet', from Old Norse rogg 'shaggy tuft', from Proto-Germanic *rawwa-. [7] The meaning of rug "evolved to 'coverlet, wrap' (1590s), then 'mat for the floor' (1808)". [7]
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