The effect of strong intermolecular and chemical interactions on the compatibility of polymers

Askadskii, А.A.

doi:10.1070/rc1999v068n04abeh000503

Cited by 23 publications

(17 citation statements)

References 55 publications

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“…The method suggested in [4][5][6][7] applies a semi empirical approach to solving this problem when primary relations for calculating the physical parameters are derived from ideas developed in the physics of solids and calibration is carried out using experimentally measured properties for well studied model polymers (so called polymer standards). Calculations of physical properties of polymers based on the chemical structure of the repeating unit applies the method of atomic physical parameters for which the fundamental parameter is the van der Waals volume of atoms that make up the repeating unit of the linear polymer or the repeating fragment of the polymer network.…”

Section: Fundamentals Of Methods For Calculating Physical Properties Omentioning

confidence: 99%

“…Calculating methods for the physical parameters of polymers based on the chemical structure of the repeating unit are only described in monographs [3][4][5][6][7]. The method suggested in [4][5][6][7] applies a semi empirical approach to solving this problem when primary relations for calculating the physical parameters are derived from ideas developed in the physics of solids and calibration is carried out using experimentally measured properties for well studied model polymers (so called polymer standards).…”

Section: Fundamentals Of Methods For Calculating Physical Properties Omentioning

confidence: 99%

“…This comes out of the generalized equation for assessing the rubber equilibrium modulus, Е ∞ , for the network systems obtained and described in [5,7,11] as follows: Fig. 4.…”

Section: Calculation Of Elasticity Modulus For Polymer Network With mentioning

confidence: 99%

“…Therefore, let us also note that, according to the definition given in [4][5][6][7], a cross linked point of a network represents a group of atoms, including those that are branching centers and neighboring atoms chemically bonded to the former with the closest substituting groups. The cross linked point structure formed in compliance with this definition is marked by a dashed line.…”

Section: Polymer Network With Organosilicon Linear Fragmentsmentioning

confidence: 99%

“…This calculation indicated that, theo retically, a broad range of variations in the elasticity modulus without applying any plasticizer or filler may be obtained by forming high cross linked network structures containing bulky, rigid, cross linked points connected by short chains of regulated length (Fig. 3) or by varying the volume of rigid cross linked points.This comes out of the generalized equation for assessing the rubber equilibrium modulus, Е ∞ , for the network systems obtained and described in [5,7,11] as follows: Fig. 4.…”

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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: Fundamentals Of Methods For Calculating Physical Properties Omentioning

confidence: 99%

Section: Fundamentals Of Methods For Calculating Physical Properties Omentioning

confidence: 99%

“…This comes out of the generalized equation for assessing the rubber equilibrium modulus, Е ∞ , for the network systems obtained and described in [5,7,11] as follows: Fig. 4.…”

Section: Calculation Of Elasticity Modulus For Polymer Network With mentioning

confidence: 99%

Section: Polymer Network With Organosilicon Linear Fragmentsmentioning

confidence: 99%

mentioning

confidence: 99%

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Gradient polymeric materials

et al. 2012

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Thermodynamic analysis of the phase equilibrium of the polystyrene‐poly(vinyl methyl ether) system

Nikulova

Chalykh

2020

J of Applied Polymer Sci

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The phase diagrams of polystyrene (PS)-poly(vinyl methyl ether) (PVME) system obtained via optical interferometry in the study of polymer interdiffusion are presented. The influence of molecular weight of the PS on the position of the binodal curve dome and the critical point is shown. Paired interaction parameters and their temperature dependences are calculated in the framework of Flory-Huggins theory both for the present experimental diagrams and for the ones, previously obtained by different authors. It is shown that the generalized temperature dependence of the Flory-Huggins parameter can be used to model phase equilibrium in a wide range of temperatures and compositions. For the first time for PS-PVME system, the generalized phase state diagram characterized by both lower and upper critical solution temperatures is calculated and constructed.

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ChemInform Abstract: The Effect of Strong Intermolecular and Chemical Interactions on the Compatibility of Polymers

Askadskii

1999

ChemInform

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The effect of strong intermolecular and chemical interactions on the compatibility of polymers

Cited by 23 publications

References 55 publications

Gradient polymeric materials

Gradient polymeric materials

Thermodynamic analysis of the phase equilibrium of the polystyrene‐poly(vinyl methyl ether) system

ChemInform Abstract: The Effect of Strong Intermolecular and Chemical Interactions on the Compatibility of Polymers

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