Journal ArticleDOI
Relationships between glass transition temperature and conversion : analyses of limiting cases
Reads0
Chats0
TLDR
In this paper, the Couchman approach to the expression of the compositional variation of glass transition temperature (or the Di-Benedetto equation) can be used to evaluate the effect of molecular weight on Tg for a stepwise linear polymer.Abstract:
The Couchman approach to the expression of the compositional variation of glass transition temperature (or the Di-Benedetto equation) can be used to evaluate the effect of molecular weight on Tg for a stepwise linear polymer. An expression for the KL constant in the Fox-Flory equation is proposed. It is also possible to estimate the TgL corresponding to the hypothetical linear structure defined in a three-dimensional network. For different epoxy-diamine systems, we have found a good concordance with the results obtained previously using an additive law.read more
Citations
More filters
Journal ArticleDOI
Predicting the Macroscopic Fracture Energy of Epoxy Resins from Atomistic Molecular Simulations
TL;DR: In this paper, a scale-bridging approach that links atomistic molecular dynamics simulations to macroscopic fracture properties on the basis of a continuum fracture mechanics model for two different epoxy materials is presented.
Journal ArticleDOI
Effects of low-temperature curing on physical behavior of cold-curing epoxy adhesives in bridge construction
TL;DR: In this paper, the effect of low-temperature curing on the physical characteristics of a commercial cold-curing epoxy adhesive was experimentally and analytically investigated with a view to a potential application in bridge construction in winter.
Journal ArticleDOI
Multi-objective optimisation of the cure of thick components
TL;DR: In this article, a multi-objective optimisation of the cure stage of composites manufacture is addressed, aiming to minimize the cure process duration and maximum temperature overshoot within the curing part by selecting an appropriate thermal profile.
Journal ArticleDOI
Toughened epoxy polymers via rearrangement of network topology
TL;DR: In this paper, the authors show that without altering the chemical structure, the network topology of a dense thermoset can be engineered to dissipate more energy before rupturing covalent bonds, producing a tougher material without sacrificing ultimate tensile strength, density, or glass transition temperature.
Journal ArticleDOI
Preparation and Corrosion Resistance of ETEO Modified Graphene Oxide/Epoxy Resin Coating
TL;DR: In this paper, a functionalized silane coupling agent (2-(3,4-epoxycyclohexyl)ethyl triethoxysilane) was synthesized to modify the surface of graphene oxide to address nanomaterial agglomeration and enhance the coating resistance of the epoxy resin coating to corrosion by filling the coating with functionalized graphene oxide.
References
More filters
Journal ArticleDOI
Second‐Order Transition Temperatures and Related Properties of Polystyrene. I. Influence of Molecular Weight
Thomas Fox,Paul J. Flory +1 more
TL;DR: In this article, the second-order transition temperature, viscosity-temperature coefficient, and specific volume of fractionated polystyrenes containing diethylbenzene end groups are presented over wide temperature ranges.
Journal ArticleDOI
Cross-Linking–Effect on Physical Properties of Polymers
TL;DR: In this article, a review of the properties of cross-linked polymers is presented from the practical viewpoint of an experimental scientist who is using cross-link polymers but who is not an expert on the theory of crosslinking.
Journal ArticleDOI
Glass transition temperature versus conversion relationships for thermosetting polymers
TL;DR: In this paper, the original DiBenedetto equation has been reevaluated as a convenient constitutive equation for expressing the glass transition temperature (Tg) versus the extent of reaction (x) of a thermoset.
Journal ArticleDOI
On the Second-Order Transition of a Rubber.
TL;DR: The view that the glass transition has a thermodynamic basis is extended to a cross-linked rubber and a relation involving no adjustable parameter is derived for the ratio of second-order transition temperatures to deformation.
Journal ArticleDOI
The evolution of thermosetting polymers in a conversion-temperature phase diagram
TL;DR: In this article, a conversion temperature phase diagram for thermosetting polymers is analyzed and conditions related to incomplete curing or falsification of kinetic parameters are stated, and the curing under different external conditions (isothermal, at a constant heating rate, adiabatic, and in a mold at constant wall temperature) are discussed.
Related Papers (5)
Glass transition temperature versus conversion relationships for thermosetting polymers
The glass transition temperature (Tg) as an index of chemical conversion for a high‐Tg amine/epoxy system: Chemical and diffusion‐controlled reaction kinetics
G. Wisanrakkit,John K. Gillham +1 more