Glucose-Biobased Non-Isocyanate Polyurethane Rigid Foams
نویسندگان
چکیده
منابع مشابه
Effects of silicon surfactant in rigid polyurethane foams
The rigid polyurethane foams (RPUFs) have been fabricated from high functional crude 4,4’-di-phenylmethane diisocyanate (CMDI) and polypropylene glycols (PPGs) for a wide range of surfactant concentration with an environmently friendly blowing agent (HFC 365mfc). Cream time, gel time, and tack-free time increased with the addition of surfactant. Foam density decreased rapidly to a minimum at 0....
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Lignin samples fractionated frommicrowave liquefied switchgrass were applied in the preparation of semirigid polyurethane (PU) foamswithout purification.Theobjective of this studywas to elucidate the influence of lignin in the PUmatrix on themorphological, chemical,mechanical, and thermal properties of the PU foams.The scanning electronmicroscopy (SEM) images revealed that lignin with 5 and 10%...
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The thermal conductivity of three mixtures of nitrogen and cyclopentane is measured using a transient hot wire method, at temperatures between 315.14 and 395.89K, and pressures up to 0.53MPa. These mixtures are important in the evaluation of the evolution of the thermal insulation capacity of closed-cell polyurethane foams considering their aging during the respective applications’ total life t...
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We use ab initio density functional calculations to study the stability, elastic properties and electronic structure of sp(2) carbon minimal surfaces with negative Gaussian curvature, called schwarzites. We focus on two systems with cubic unit cells containing 152 and 200 carbon atoms, which are metallic and very rigid. The porous schwarzite structure allows for efficient and reversible doping ...
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Lignin is the second most abundant biopolymer on Earth, right after cellulose, with a highly complex chemical structure that hinders its possible utilizations. As a consequence, it is mostly burned as an inexpensive resource, generating green electricity or heat that in turn can be used for the deconstruction of biomass itself. Applications that utilize lignin in different manners are of great ...
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ژورنال
عنوان ژورنال: Journal of Renewable Materials
سال: 2019
ISSN: 2164-6341
DOI: 10.32604/jrm.2019.04174