Synthesis of Polyurethane from One Hundred Percent Sustainable Natural Materials through Non-isocyanate Reactions
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منابع مشابه
Specific interactions, structure and properties in segmented polyurethane elastomers
Two sets of segmented polyurethane (PU) elastomers were prepared from 4,4!-methylenebis(phenyl isocyanate) (MDI), 1,4-butanediol (BD) and a polyester or a polyether polyol, respectively. The molecular mass of both polyols was 1000 g/mol. The stoichiometric ratio of isocyanate and hydroxyl groups was 1 and the polyol/total diol ratio changed from 0 to 1 in 0.1 steps. One step bulk polymerization...
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Two hyperbranched polyglycerols (HBPGs) and one oligoglycerol containing bisphenol A in the core of the molecule were synthesized from glycerol carbonate and applied as polyols in 2-component polyurethane adhesive systems. It was shown that mechanical performance of the joints made in solid wood depended on the hydroxyl functionality of the polyglycerol as well as on the type of the isocyanate ...
متن کاملStudies of Ventilatory Capacity and Histamine Response during Exposure to Isocyanate Vapour in Polyurethane Foam Manufacture.
Complaints of respiratory symptoms amongst workers in a factory using isocyanate to produce polyurethane foam led to a study of changes in ventilatory capacity in the course of several working days. Mean decreases of the order of 018 1. were observed in the forced expiratory volume at one second in 15 employees during each of three normal working shifts. No significant change occurred on days w...
متن کاملSynthesis and characterisation of coating polyurethane cationomers containing fluorine built-in hard urethane segments
Polyurethane cationomers were synthesised in the reaction of 4,4'-methylenebis(phenyl isocyanate) with polyoxyethylene glycol (M = 2,000) or poly(tetrafluoroethyleneoxide-co-difluoromethylene oxide) α,ω-diisocyanate and N-methyl diethanolamine. Amine segments were built-in to the urethane-isocyanate prepolymer in the reaction with 1-bromobutane or formic acid, and then they were converted to al...
متن کاملSkin Exposure to Isocyanates: Reasons for Concern
OBJECTIVE Isocyanates (di- and poly-), important chemicals used worldwide to produce polyurethane products, are a leading cause of occupational asthma. Respiratory exposures have been reduced through improved hygiene controls and the use of less-volatile isocyanates. Yet isocyanate asthma continues to occur, not uncommonly in settings with minimal inhalation exposure but opportunity for skin ex...
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تاریخ انتشار 2014