Polyurethanes: Design, synthesis and structure-property behavior of versatile materials
نویسندگان
چکیده
منابع مشابه
Polyurethanes: versatile materials and sustainable problem solvers for today's challenges.
Polyurethanes are the only class of polymers that display thermoplastic, elastomeric, and thermoset behavior depending on their chemical and morphological makeup. In addition to compact polyurethanes, foamed variations in particular are very widespread, and they achieve their targeted properties at very low weights. The simple production of sandwich structures and material composites in a singl...
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Background: Following the spread of dissatisfaction with modern architecture, the machine attitude towards man, and the disregard for human values and human existential dignity, the global movement in support of independence and participation was formed in response to demographic and social realities. Recognized in 1988 as universal design, the movement allowed more people of all levels of ab...
متن کاملFluorinated Polyurethanes, Synthesis and Properties.
Fluorinated polyurethanes with a glass transition temperature as low as -139 °C and a decomposition onset temperature of 247-330 °C were prepared by a reaction of fluorinated alcohols with aromatic and cycloaliphatic diisocyanates in solution or melt.
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چکیده: فرض کنید که تابعی از اپسیلون یک مجموع نامتناهی از احتمالات موزون مربوط به مجموع های جزئی براساس یک دنباله از متغیرهای تصادفی مستقل و همتوزیع باشد، و همچنین فرض کنید توابعی مانند g و h وجود دارند که هرگاه امید ریاضی توان دوم x متناهی و امیدریاضی x صفر باشد، در این صورت می توان حد حاصلضرب این توابع را بصورت تابعی از امید ریاضی توان دوم x نوشت. حالت عکس نیز برقرار است. همچنین ما با استفاده...
15 صفحه اولStructure-property studies of thermoplastic and thermosetting polyurethanes using palm and soya oils-based polyols.
Palm and soya oils were converted to monoglycerides via transesterification of triglycerides with glycerol by one step process to produce renewable polyols. Thermoplastic polyurethanes (TPPUs) were prepared from the reaction of the monoglycerides which act as polyol with 4,4'-methylenediphenyldiisocyanate (MDI) whereas, thermosetting polyurethanes (TSPUs) were prepared from the reaction of glyc...
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ژورنال
عنوان ژورنال: Hacettepe Journal of Biology and Chemistry
سال: 2020
ISSN: 1303-5002
DOI: 10.15671/hjbc.809902