Synthesis and mechanical behavior of functionally gradient polyisocyanurate materials based on hydroxy-terminated butadiene rubber

Аскадский, А.А.; Goleneva, L. M.; Бычко, К. А.; Afonicheva, O. V.

doi:10.1134/s0965545x08070080

Cited by 11 publications

(11 citation statements)

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“…Taking into account the results obtained, the second alternative of synthesis was implemented by the method of the polymerization of polyisocyanurate networks, the chemical structure of which can be vol untarily changed in the same sample and, therefore, vary its deformation properties in any direction [20][21][22][23][24][25].…”

Section: Polymer Network With Polyether and Polydiene Linear Fragmentsmentioning

confidence: 99%

“…To specify the real possibility of this control of the polymer properties, the glass transition temperature Т g of studied network systems with regard to their chemical composition was calculated [21] using the atomic constants method [5][6][7]. Figure 11 shows a smooth decrease in Т g with an increase in the flexible rubbery fragment fracture α.…”

Section: Polymer Network With Polyether and Polydiene Linear Fragmentsmentioning

confidence: 99%

“…For the first time, the idea of obtaining materials with controllable (gradient) properties by smoothly changing the initial component dosage at the stage of mixing in the reaction composition, as a result of which the chemical composition of the synthesized polymer network was directly regulated in the same sample, was implemented in [21,22]. The industrial product tetrahydrofuran copolymer with propylene oxide (PF OP 15) with a molecular mass М = 1700 is used as oligomeric diol forming flexible linear frag ments in the structure of synthesized polyisocyanurate.…”

Section: Polymer Network With Polyether and Polydiene Linear Fragmentsmentioning

confidence: 99%

“…Moreover, the conditions of a stepped temperature rise to the final temperature of approximately 470-480 K should be observed, which is necessary for the quantitative con version of functional groups. In connection with this, the chemical process was studied in detail and the best conditions of obtaining the above described networks are determined [21].…”

Section: Polymer Network With Polyether and Polydiene Linear Fragmentsmentioning

confidence: 99%

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Gradient polymeric materials

et al. 2012

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Data on gradient polymeric materials that possess broadly varying mechanical, optical, and other properties are generalized. The term "gradient materials of the first type" refers to materials that possess a gradually variable elasticity modulus in the range of 3-2000 MPa for the same material that possesses no layers or interfaces, pasting, heat sealing, etc. They are produced as either transpar ent molds or composites with various reinforced fillers. The synthesis of these materials is based on the formation of polymer networks containing bulky cross linked points with short flexible fragments linking them. These networks have been computer simulated using the physical approach developed by the authors and the chosen software, which allows one to calculate polymer properties based on their chemical structure and the implementation of computerized synthesis of polymers with pre scribed properties. The term "gradient materials of the second type" refers to materials with abruptly changing elasticity modulus and transition zone between the glassy and the rubbery states. GRADIENT POLYMERIC MATERIALS 109 pound. Since the search for such a structure is one of the objectives of this method, consistent description of structures in the method of atomic constants and in CPOS must be provided. The table of atoms and the table of relatedness that sets the selection of atoms and types of bonds in the compound structure are fundamental for CPOS software. The application of this method induces the suit ability of forming these tables for every processed formula of the repeating unit. The problem of the user's communication with the software is of special interest. The image of the structure represents a planar dis position of atoms linked by definite types of bonds. If necessary, correspondence to linear Wiswesser for mulas [10] or Morgan's record form [11] is set using tables of atoms or relatedness. The problem of unique interpretation of the repeating unit structure indicated on the display is of importance. For this purpose, the presence of information about atoms, groups of atoms, and bonds in the database is monitored by the program. The program is compatible with Windows 95 or more recent versions.The Cascade program allows one to calculate more than 60 properties of polymers and copolymers. The most fundamental properties in accordance with the review are the van der Waals volume, Hildebrand solubility parameter, surface energy, refractive index at room temperature, dielectric constant at room temperature, glass transition temperature, dependence of glass transition temperature on molecular mass, temperature of onset of intensive thermal degradation, interface tension at the polymer-polymer boundary, and the elasticity modulus of rubber (rubber like plateau).The software enables one to calculate the properties of copolymers, homogeneous mixtures of poly mers, etc. The Cascade program enables the calculation of 16 characteristics for low molecular weight organic liquids. Calculation of Elasticity Modulus for Polyme...

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Section: Polymer Network With Polyether and Polydiene Linear Fragmentsmentioning

confidence: 99%

Section: Polymer Network With Polyether and Polydiene Linear Fragmentsmentioning

confidence: 99%

Section: Polymer Network With Polyether and Polydiene Linear Fragmentsmentioning

confidence: 99%

Section: Polymer Network With Polyether and Polydiene Linear Fragmentsmentioning

confidence: 99%

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Gradient polymeric materials

et al. 2012

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“…By changing the type and functionality of the polyol and isocyanate precursors, the properties of PU can be easily tailored, ranging from rigid solid to flexible elastomer [1][2][3]. Fluorinated polyurethane coatings not only maintain most of the outstanding mechanical properties of polyurethane, but also offer the basic advantages of improved solvent and chemical resistance, low surface energy, and low coefficient of friction by introducing a fluorine chain segment into the molecular chains of polyurethane.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Fluorinated Hydrophobic UV-Crosslinkable Thiol-Ene Polyurethane Coatings

et al. 2017

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Abstract:The polyurethane prepolymer terminated with a double bond was synthesized using isophorone diisocyanate (IPDI), hydroxyl terminated polybutadiene (HTPB), 1,4-butanediol (BDO), and 2-hydroxyethyl acrylate (HEA). Then, a series of innovative UV-curable polyurethane coatings were prepared by blending ene-terminated polyurethane, fluoroacrylate monomer, and multifunctional thiol crosslinker upon UV exposure. The incorporation of fluoroacrylate monomer and multifunctional thiols into polyurethane coatings significantly enhanced the hydrophobic property, mechanical property, pencil hardness, and glossiness of the polyurethane coatings. This method of preparing UV crosslinkable, hydrophobic polyurethane coatings based on thiol-ene chemistry exhibited numerous advantages over other UV photocuring systems.

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Polymer Gradient Materials: Can Nature Teach Us New Tricks?

Claussen¹,

Scheibel²,

Schmidt³

et al. 2012

Macro Materials & Eng

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Nature offers interesting examples of structures with a gradually changing composition that provides unique mechanical properties. Today, the transfer of biological principles to technical applications is gaining increasing attention. One prominent example of the transfer of biomimetic principles to materials science is the mussel byssus. Byssus threads possess gradually changing mechanical properties from soft to stiff in order to efficiently attach the mussel to the rock. This design is the basis for polymer gradient materials. Herein, we give a comprehensive overview of the most recent developments in the field of PGMs. In addition to basic terminology and definitions, selected highlights of PGMs are presented, followed by experimental techniques and characterization methods.magnified image

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Synthesis and mechanical behavior of functionally gradient polyisocyanurate materials based on hydroxy-terminated butadiene rubber

Cited by 11 publications

References 1 publication

Gradient polymeric materials

Gradient polymeric materials

Preparation and Characterization of Fluorinated Hydrophobic UV-Crosslinkable Thiol-Ene Polyurethane Coatings

Polymer Gradient Materials: Can Nature Teach Us New Tricks?

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