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New multifunctional thermosets obtained by dual curing

Total activity: 16
Type of activity
Competitive project
Acronym
DUALCURE
Funding entity
MIN DE ECONOMIA Y COMPETITIVIDAD
Funding entity code
MAT2014-53706-C3-2-R
Amount
60.500,00 €
Start date
2015-01-01
End date
2017-12-31
Keywords
click chemistry, conductividad térmica, curado dual, dual curing, memoria de forma, química click, shape memory, termoestable, thermal conductivity, thermoset
Abstract
The objective of this project is the preparation and characterisation of novel thermosets with improved processability for advanced
applications. To this end it is proposed to use click reactions, which permit a dual cure process to take place in two stages. The reactions
are rapid, efficient, versatile and selective, and allow the two stages of the dual cure process to occur sequentially but independently, as
well as being initiated in a controlled manner. The use of systems with latent curing agents activated by an external stimulus, either
thermal or photochemical, will allow mono-component formulations to be prepared, which can be stored for lengthy periods of time before
their use in service.
It is proposed to use various monomers: simple epoxides, alkynyls, and vinyls or alpha,beta-conjugated bi- or multi-functional monomers,
and hyperbranched polymers with modified end groups. These will be cross-linked under thermal or photochemical conditions using
suitable curing agents selected appropriately: thiols, amines, beta-ketoesters, radical generators, and cationic or anionic species. The
chemical reactions that are relevant here are thiol-ene, thiol-epoxy, cationically and anionically initiated epoxy homopolymerisation, azideino,
aza-Michael and thiol-Michael, and radical polymerisation of activated vinyl compounds. The study of the cure and its optimisation as a
function of the formulations and the conditions of cure will be the principal task of this project, and is the basis upon which the proposed
applications will be developed.
The advanced technological applications proposed are the following: (i) shape memory materials; (ii) insulated metal substrates with low
electrical conductivity and high thermal conductivity.
The shape memory properties will be investigated for those materials which have previously been shown to have suitable values of glass
transition temperature and elastic moduli. It is anticipated that suitable shape memory properties will be achieved either at the end of the
dual cure or in the intermediate stage, depending on the degree of cure and the nature of the reactants. In the latter case, the material at
the end of the first stage of the dual cure could be folded or otherwise deformed during a storage period. Subsequently, by heating above
the transition temperature the initial shape can be recuperated, and the second stage of the dual cure can then be initiated in order to
induce greater stability and significantly increase the mechanical properties.
In respect of the fabrication of insulated metal substrates, the use of increasingly higher powers and frequencies in devices such as light
emitting diodes and highly integrated memory chips implies the need to increase the ability to dissipate the heat generated. The use of
insulated metal substrates in which the printed circuit is bonded to a metal substrate by a dielectric layer, demands a combination of
electrical insulation and increasingly higher thermal conductivity. To achieve this objective, together with ease of fabrication, acceptable
cost and compatibility with the substrate, this project proposes the development of dielectric layers consisting of a matrix containing
thioether groups filled with boron nitride particles. Furthermore, the development of dual cure systems for this application would allow their
use in discontinuous production lines in which the dielectric material can be stored for a period of time before its final assembly.
Scope
Adm. Estat
Plan
Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016
Call year
2015
Funcding program
Programa Estatal de I+D+i Orientada a los Retos de la Sociedad
Funding call
Retos de Investigación: Proyectos de I+D+i
Grant institution
Gobierno De España. Ministerio De Economía Y Competitividad, Mineco

Participants

Scientific and technological production

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