The Dependence of Glass Transition Temperature and Flow Temperature on Solvent or Plasticiser Concentration

2017 ◽  
Vol 44 (1) ◽  
pp. 17-22 ◽  
Author(s):  
T.A. Matseevich ◽  
L.M. Goleneva ◽  
E.S. Afanas'ev ◽  
E.A. Kurskaya ◽  
O.V. Kovriga ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Intermolecular Interaction ◽  
Chemical Structure ◽  
Van Der Waals ◽  
Flow Temperature ◽  
Van Der Waals Volume ◽  
Thinning Effect

A scheme has been developed for calculating the glass transition temperature and flow temperature of plasticised polymers. The scheme takes into account the chemical structure of the polymer and plasticiser, the molecular weight of the polymer, the intermolecular interaction between the polymer and plasticiser, the van der Waals volume of the repeating unit of the polymer and the plasticiser molecule, and the plasticiser concentration. The thinning effect is also taken into account, as manifested by a reduction in the viscosity of the polymer–plasticiser system with increasing plasticiser concentration.

An Approach to Analysing the Influence of the Chemical Structure of the Solvents and their Concentration on the Glass Transition Temperature of the Polymer for Systems Containing a Polymer and Two Solvents

2017 ◽  
Vol 44 (4) ◽  
pp. 41-44
Author(s):  
T.A. Matseevich ◽  
E.A. Kurskaya ◽  
O.V. Kovriga ◽  
A.A. Askadskii
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Intermolecular Interaction ◽  
Chemical Structure ◽  
Van Der Waals ◽  
Van Der Waals Volume

A scheme has been developed for calculating the glass transition temperature of a system containing a polymer and two different solvents. Account is taken of the chemical structure of the polymer and solvents (one of them may be a plasticiser), the intermolecular interaction between the polymer and solvents, and also between the solvents themselves, the van der Waals volume of the repeating unit of the polymer and molecules of both solvents, and their concentration.

The Influence of the Chemical Composition and Concentration of Components of a Polymer/Nanoparticle Mixture on their Flow Temperature

2017 ◽  
Vol 44 (10) ◽  
pp. 23-26
Author(s):  
T.A. Matseevich ◽  
O.V. Kovriga ◽  
A.A. Askadskii
Keyword(s):  
Molecular Weight ◽  
Chemical Composition ◽  
Computer Program ◽  
Intermolecular Interaction ◽  
Chemical Structure ◽  
Van Der Waals ◽  
Calculation Scheme ◽  
Flow Temperature ◽  
Van Der Waals Volume ◽  
Polar Groups

A scheme has been developed for calculating the flow temperature, Tf, of a system containing a polymer and nanoparticles. The chemical structure of the polymer and nanoparticles, the intermolecular interaction between polymer and nanoparticle when the latter is modified with polar groups, the van der Waals volume and the molecular weight of the polymer, and the concentration and shape of the nanoparticles were taken into account. The dependences of Tf on the radius of the nanoparticles, their concentration, and the number of polar groups grafted to their surface have been established. The calculation scheme has been computerised and is a separate option in the ‘Kaskad’ computer program developed by INEOS.

scholarly journals Glass transition temperature and elastic modulusof nanocomposites based on polyimides

Vestnik MGSU ◽  
2015 ◽  
pp. 50-63
Author(s):  
Tat’yana Anatol’evna Matseevich ◽  
Marina Nikolaevna Popova ◽  
Andrey Aleksandrovich Askadskiy
Keyword(s):  
Mechanical Properties ◽  
Glass Transition ◽  
Elastic Modulus ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Chemical Structure ◽  
Van Der Waals Volume ◽  
Polar Groups ◽  
Wide Range ◽  
Nanoparticles Concentration

Today great attention is paid to production and research of the mechanical and termal properties of nanocomposites based on polyimides. These polymers are heatresisting and possess the increased mechanical properties in wide range of temperatures. Various nanoparticles are introduced into polyimides: graphite nanotubes and flatparticles, the particles of SiO , the surface of which is modified, the particles of ZrOandmontmorillonite, etc.The authors analyzed the influence of nanoparticles on the glass transition temper-ature T and elastic modulus E of the polyimides based on 1,3-bis-(3,3’,4,4’-dicarboxy-phenoxy)benzene and 4,4’-bis-(4-aminophenoxy)biphenyl, and pyromellitic dianhydride and oxydianiline. Nanoparticles introduced in small amounts are produced of graphite and ZrO . The suggested ratios take into account the chemical structure of the polymer and nanoparticles, as well as the structure of their surface in case of chemical modification; the concentration of nanoparticles and their form, the number of polar groups on the surface. The number of polar groups and nanoparticles’ concentration have the greatest influence on T . The elastic modulus of nanocomposites depending on nanoparticles’ concentration is connected with van der Waals volume of the repeating unit of polymer and nanoparticle.

Imide Oligomers Containing Pendent and Terminal Phenylethynyl Groups—II

1998 ◽  
Vol 10 (3) ◽  
pp. 273-283 ◽  
Author(s):  
J W Connell ◽  
J G Smith ◽  
P M Hergenrother
Keyword(s):  
Molecular Weight ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Average Molecular Weight ◽  
Adhesive Tape ◽  
High Glass Transition Temperature ◽  
Compressive Properties ◽  
Compression Moulding ◽  
Imide Oligomers

As part of a programme to develop high-performance/high-temperature structural resins for aeronautical applications, imide oligomers containing pendent and terminal phenylethynyl groups were prepared, characterized and the cured resins evaluated as composite matrices. The oligomers were prepared at a calculated number-average molecular weight of 5000 g mol−1 and contained 15–20 mol% pendent phenylethynyl groups. In previous work, an oligomer containing pendent and terminal phenylethynyl groups exhibited a high glass transition temperature (∼313 °C), and laminates therefrom exhibited high compressive properties, but processability, fracture toughness, microcrack resistance and damage tolerance were less than desired. In an attempt to improve these deficiencies, modifications in the oligomeric backbone involving the incorporation of 1,3-bis(3-aminophenoxy)benzene were investigated as a means of improving processability and toughness without detracting from the high glass transition temperature and high compressive properties. The amide acid oligomeric solutions were prepared in N-methyl-2-pyrrolidinone and were subsequently processed into imide powder, thin films, adhesive tape and carbon fibre prepreg. Neat resin plaques were fabricated from imide powder by compression moulding. The maximum processing pressure was 1.4 MPa and the cure temperature ranged from 350 to 371 °C for 1 h for the mouldings, adhesives, films and composites. The properties of the 1,3-bis(3-aminophenoxy)benzene modified cured imide oligomers containing pendent and terminal phenylethynyl groups are compared with those of previously prepared oligomers containing pendent and terminal phenylethynyl groups of similar composition and molecular weight.

Properties of Hyperbranched Polyglycidol’s Derivatives

2020 ◽  
Vol 869 ◽  
pp. 190-195
Author(s):  
Yuri Mikhailov ◽  
Ludmila Romanova ◽  
Anna Darovskikh ◽  
Nilson Garifullin
Keyword(s):  
Molecular Weight ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Functional Groups ◽  
Enthalpy Of Formation ◽  
Rheological Parameters ◽  
Weight Composition ◽  
Composition And Structure

Some properties (enthalpy of formation, glass transition temperature and rheological parameters) of hyperbranched polyglycidol derivatives containing nitrate and azide functional groups were investigated. The dependence of the found properties on the molecular weight, composition and structure of the investigated substances was determined.

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