A new perspective on the glass transition, tack and rheology of oligomeric epoxy resins

•Analysis of the glass transition temperature of oligomeric epoxy resins.•Determination of the fragility of epoxy oligomers using rheometry and differential scanning calorimetry (DSC).•Estimation of the molecular weight characteristics based on the frequency dependence of loss modulus. Bis-phenol A...

Full description

Saved in:
Bibliographic Details
Published inJournal of non-crystalline solids Vol. 646; p. 123261
Main Authors Amirova, LM, Andrianova, KA, Gaifutdinov, AM, Amirov, RR
Format Journal Article
LanguageEnglish
Published Elsevier B.V 15.12.2024
Subjects
Differential scanning calorimetry
Dynamic modulus
Fragility
Glass transition temperature
Tack
Time-temperature superposition
Viscosity
Viscosity
Differential scanning calorimetry
Tack
Dynamic modulus
Time-temperature superposition
Glass transition temperature
Fragility
Online AccessGet full text

Cover

More Information
Summary:•Analysis of the glass transition temperature of oligomeric epoxy resins.•Determination of the fragility of epoxy oligomers using rheometry and differential scanning calorimetry (DSC).•Estimation of the molecular weight characteristics based on the frequency dependence of loss modulus. Bis-phenol A based oligomeric epoxy resins with known molecular characteristics were selected as model liquids for the study of glass transition processes, rheological properties and tack. The effect of cooling and heating rates on the glass transition dynamics of epoxy resins has been studied. Rheology and differential scanning calorimetry methods were used to determine the fragility indices of oligomeric epoxy resins. The tack of oligomers was determined as a function of the reduced temperature T/Tg, and it is shown that the tack parameters for all studied oligomers correlate well with their fragility indices. Rheological measurements of epoxy oligomers were performed in the oscillation mode in a wide frequency range. Applying the principle of time-temperature superposition, generalized dependencies of the storage and loss modulus on the weight average molecular weight and molecular-mass distribution was determined. The parameters of generalized frequency dependences of the complex modulus components and the molecular weight characteristics of oligomers were correlated. [Display omitted]
ISSN:0022-3093
DOI:10.1016/j.jnoncrysol.2024.123261