Lignin-Polyurethane Based Biodegradable Foam
نویسندگان
چکیده
منابع مشابه
Producing Lignin-Based Polyols through Microwave-Assisted Liquefaction for Rigid Polyurethane Foam Production
Lignin-based polyols were synthesized through microwave-assisted liquefaction under different microwave heating times (5-30 min). The liquefaction reactions were carried out using polyethylene glycol (PEG-400)/glycerol as liquefying solvents and 97 wt% sulfur acid as a catalyst at 140 °C. The polyols obtained were analyzed for their yield, composition and structural characteristics using gel pe...
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Anisotropic polymer foams have been prepared, which exhibit a Poisson's ratio exceeding 1, and ratios of longitudinal to transverse stiffness exceeding 50. The foams are as much as 20 times stiffer in the longitudinal direction than the foams from which they were derived. The transformation process involved applying a uniaxial stress sufficient to produce 25% to 45% axial strain to open-cell po...
متن کاملCharacterization of Renewable PUF and Preparation of Polyurethane Foam Composites with Alkali Lignin/Renewable PUF
The renewable PUF was prepared by the alcoholysis of the used polyurethane foam composite and the polyurethane foam composite was also prepared by alkali lignin and renewable PUF. The renewable PUF was examined by GC-MS, the results showed the renewable PUF mainly consists of glycol, propanol and 1, 2-Benzenedicarboxylic acid, which can directly be used as the raw material of polyurethane foam ...
متن کاملBiodegradable lignin nanocontainers†
Lignin is one of the most abundant renewable biomaterials which can be extracted from plants and which represents approximately 15–30% of their total mass besides cellulose. In spite of these high amounts and its ready availability, lignin is normally considered as a non-preferred byproduct from the paper industry for example with over 30 mio tons per annum. A major reason for this is probably ...
متن کاملClosure of oroantral communications using biodegradable polyurethane foam: a feasibility study.
PURPOSE The aim of this study was to assess the feasibility of biodegradable polyurethane (PU) foam for closure of oroantral communications (OACs). PATIENTS AND METHODS Ten consecutive patients with OACs (existing <24 hours) were treated with PU foam. Standardized evaluations were performed at 2 weeks and 8 weeks after closure of the OAC. RESULTS In 5 patients, the OACs were closed successf...
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ژورنال
عنوان ژورنال: Open Journal of Polymer Chemistry
سال: 2018
ISSN: 2165-6681,2165-6711
DOI: 10.4236/ojpchem.2018.81001