N-Phenylaminomethyl hybrid silica, a better alternative to achieve reinforced PU nanocomposites
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A novel NPAM-silica was synthesized by an economic and environmentally friendly method. It was chemically cooperated into polyurethane with enhanced mechanical properties. Compared with Keywords:
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Polyurethane nanocomposites with inorganic nano fillers for the improvement thermal stability were prepared by the urethane reaction. Fire retardation properties of polyurethane nanocomposites were investigated by cone calorimeter and limited oxygen index (LOI). Maximum heat release rate of MMT-PU and polyurethane nanocomposites were decreased as 50% than polyurethane matrix and fire retardation properties of nanocomposte had the best improvement. The LOI of polyurethane nanocomposites also were improved as filling fillers in the nanocomposites over 20. The maximum heat release rates of MMT-PU, polyurethane nanocomposites were 764, 707, , respectively and polyurethane nanocomposite exhibited the highest value of fire-retardant. We confirmed that polyurethane nanocomposites improved the fire retardation properties.
Cone calorimeter
Thermal Stability
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The key research of anionic aqueous polyurethane,the factors to affect the performance of aqueous polyurethane and processing mechanism of waterborne polyurethane dispersion were discussed in this paper.The progress on its modifying of anonic aqueous polyurethane was summarized.Some suggestions of the progress of waterborne polyurethane for the future was put forward.
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Polyurethanes are versatile materials used widely in many applications. Annual production of polyurethanes is increasing day by day. The most important application of polyurethane covering its major market is polyurethane foam. Flexible and rigid foams are two major types of polyurethane foam used widely. Flexible and rigid foam samples were synthesized on lab scale by cup foaming. All samples were characterized by finding density of each sample. Cream, gel and rise time were also estimated for each sample. The chemical compositions of all polyurethane foam samples were characterized by FTIR analysis.
Characterization
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基于 Cu 的 thermosensitive nanocomposites 被高精力球 milling 做。基于 Cu 的 thermosensitive nanocomposites 的微观结构和性质被传播电子显微镜学(TEM ) 和 themosensitivity 测试学习。milling 时间在微观结构的效果和基于 Cu 的 nanocomposite 材料的 thermosensitivity 被研究。基于 Cu 的 nanocomposite 能被高精力球 milling 做的 Theresults 表演。作为他们， illing 时间增加，在 nanocomposite 的铜粒子尺寸减少，然后， nanocomposite 的 thethermoexpansivity 增加。当 milling 时间直到 100 h 时， nanocomposite 具有最好的 thermoexpansivity。在 35-45 deg C， nanocomposite 显示出好 thermosensitivity。
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This paper evaluated the function and importance of aqueous polyurethane dispersions. The research development of aqueous polyurethane dispersions was reviewed, too. The methods for preparing aqueouos polyurethane dispersions were summarized. It was told that the main method was that in the systems of aqueous polyurethane dispersions both vinyl group and isocyanate group were used simultaneously to form interpenetrating polymer networks. Finally the application development trend of aqueous polyurethane dispersions was pointed out.
Isocyanate
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This chapter contains sections titled: Introduction Ceramic/Metal Nanocomposites Nanocomposites by Mechanical Alloying Nanocomposites from Sol–Gel Synthesis Nanocomposites by Thermal Spray Synthesis Metal Matrix Nanocomposites Bulk Ceramic Nanocomposites for Desired Mechanical Properties Thin-Film Nanocomposites: Multilayer and Granular Films Nanocomposites for Hard Coatings Carbon Nanotube-Based Nanocomposites Functional Low-Dimensional Nanocomposites Encapsulated Composite Nanosystems Applications of Nanocomposite Wires Applications of Nanocomposite Particles Inorganic Nanocomposites for Optical Applications Inorganic Nanocomposites for Electrical Applications Nanoporous Structures and Membranes: Other Nanocomposites Nanocomposites for Magnetic Applications Particle-Dispersed Magnetic Nanocomposites Magnetic Multilayer Nanocomposites Nanocomposite Structures having Miscellaneous Properties Concluding Remarks on Metal/Ceramic Nanocomposites
Nanoporous
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Research progress of application of polyurethane in functional polymers was reviewed in this paper.The study of biodegradable polyurethane,medical polyurethane,conductive polyurethane,antistatic polyurethane,antibacterial polyurethane and luminous polyurethane were introduced.The prospective development of these polyurethane is put forward.
Antistatic agent
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Polymers have become essential part of life. One can’t think of life without polymers, reason being their innumerable physical and engineering characteristics. Most prominent quality of polymers is their low cost and durability.However, seize to strength ratio of polymers is large as compared to metals. Heat capacity of polymers is also less. Structural strength of polymers is also poor which make them unsuitable for heavy structures. Above all polymer are non biodegradables they may persist in environment for centuries. Due to this disability many countries have imposed restrictions on their use. Low price, long life and readiness to adopt any shape has made polymers invulnerable. Non bio degradability of synthetic polymers shifted the quilt towards the invention of biopolymers. Scientists found the solution in biopolymers. They can be biosynthesized by living organisms or chemically synthesized from biological matter. The biopolymers are natural polymers formed by living organisms. Biopolymers are monomeric units which are bound covalently to form large molecules. Unlike polymers the biopolymers are biodegradable which decompose in bio-products with time after the expiry of intended purpose. Mainly there are three classes of biodegradable polymers namely polysaccharides, polypeptides and poly nucleotides Biopolymers mostly find applications in manufacturing, packaging, biomedical engineering and food industry. Difference between natural and synthetic polymers is discussed. Advantages of biopolymers over polymers are compared. Present study enlists brief overview of biopolymers. Keywords: Polymers, Biopolymers, Biodegradable Abbreviations: PVC, PVDF, Tg, DNA, RNA
Biopolymer
Natural polymers
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