Abstract:
A curable resin comprising a curing agent, wherein the curing agent comprises an adjustable structural unit having a stable chain-like arrangement which is adjustable to a stable ring-like arrangement, wherein the ring-like arrangement comprises the constituents of the chain-like arrangement with two terminal constituents exhibiting an attractive chemical interaction, and is adjustable back from the ring-like arrangement to the chain-like arrangement by separation of the two terminal constituents.
Abstract:
A method of controlling a process for the manufacture of a multicomponent sheet material having a desired pre-determined parameter comprising applying an acoustic or an electromagnetic signal to interact with the sheet material whereby the interaction modifies the applied signal, detecting the modified signal, comparing the modified signal or data derived from it with data relating to the pre-determined parameter and modifying at least one step of the process whereby the data relating to the modified signal is modified towards the data relating to the pre-determined parameter.
Abstract:
A composite material (1) comprising at least one prepreg (3), said prepreg comprising at least one polymeric resin and optionally at least one fibrous reinforcement; and a conducting ink (2) applied to at least one surface of said prepreg (3); where the conducting ink (2) has a surface tension lower than the surface energy of the at least one surface of said prepreg (3) to which the ink (2) is applied.
Abstract:
A non-fibrous, apertured membrane comprises at least one thermoplastic polymeric material and has a discrete porous structure. The membrane is soluble in the thermoset matrix polymer of a composite material.
Abstract:
Composite material that contain epoxy resin which is toughened and strengthened with thermoplastic materials and a blend of insoluble particles. The uncured matrix resins include an epoxy resin component, a soluble thermoplastic component, a curing agent and an insoluble particulate component composed of elastic particles and rigid particles. The uncured resin matrix is combined with a fibrous reinforcement and cured/molded to form composite materials that may be used for structural applications, such as primary structures in aircraft.
Abstract:
A curable resin comprising a curing agent, wherein the curing agent comprises an adjustable structural unit having a stable chain-like arrangement which is adjustable to a stable ring-like arrangement, wherein the ring-like arrangement comprises the constituents of the chain-like arrangement with two terminal constituents exhibiting an attractive chemical interaction, and is adjustable back from the ring-like arrangement to the chain-like arrangement by separation of the two terminal constituents.
Abstract:
A prepreg comprising a single structural layer of electrically conductive unidirectional fibers and a first outer layer of curable resin substantially free of structural fibers, and optionally a second outer layer of curable resin substantially free of structural fibers, the sum of the thicknesses of the first and second outer resin layers at a given point having an average of at least 10 micrometers and varying over at least the range of from 50% to 120% of the average value, and wherein the first outer layer comprises electrically conductive particles.
Abstract:
The invention relates to a resin curing agent having the formula (I), wherein R1 to R4 are each individually selected from linear or branched C1 to C5 alkyl, a process for its manufacture, blends of the reaction products, and two-component curable resin systems.
Abstract:
A resin composition that is storable at ambient temperatures. The resin composition forms a cured resin when exposed to a curing agent and heated to a curing temperature that is relatively close to ambient temperature. The resin composition includes a resin component that is composed of a liquid part that is made up of one or more liquid thermosetting resins and a solid part that includes particles of one or more solid thermosetting resins. The liquid part further includes a gelation agent that is present in a sufficient amount to maintain the particles in suspension within the liquid part at ambient temperatures. The viscosity of the resin component changes from a high viscosity state to a low viscosity state when the temperature is increased from ambient temperature to the curing temperature. The high viscosity state is substantially more viscous than the low viscosity state.
Abstract:
An epoxy resin composition comprising an epoxy resin component combined with a sufficient amount of an imidazole curative to provide curing of the epoxy resin composition. The epoxy resin composition further includes a non-hydroxyl containing cure accelerator for the imidazole curative.