Term
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Definition
| a quantity equal to the negative logarithm of the transmittance in an infrared spectrometer |
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Term
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Definition
| the condition of a thermoset resin system in an uncured state |
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Term
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Definition
| the condition of a thermoset resin system in a state of partial cure but prior to the gel point |
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Term
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Definition
| the name of the major class of polymerization that involves linking together of monomers with double or triple carbon-carbon bonds. The resulting polymers have main chains comprised only of carbon (with a few exceptions containing -C-C-O- repeat units) |
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Term
| Coefficient of Linear Thermal Expansion |
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Definition
| the change in length of a material in one direction per unit length and unit change in temperature |
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Term
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Definition
| a synergistic mixture of two or more dissimilar materials that remain in different solid phases |
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Term
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Definition
| a quantity that is inversely proportional to the molecular weight between crosslink junctions in thermosets and elastomers; this is related to the number of crosslinks per unit volume |
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Term
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Definition
| an atom that links 2 or more polymer chains together |
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Term
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Definition
| the condition of a thermoset resin system in a state of advanced cure beyond the gel point |
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Term
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Definition
| the term used for polymerization of monomers that form a 3-D covalently bonded network |
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Term
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Definition
| mathematical quantity that describes how complete is the reaction of monomers based on the concentration of remaining reactive groups |
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Term
| Differential Scanning Calorimetry (DSC) |
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Definition
| an analytical technique that measures the net heat flow into a material as the temperature is raised |
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Term
| Dynamic Mechanical Analysis (DMA) |
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Definition
| an analytical technique that measures the mechanical response of a material to a small but oscillating stress as the temperature is raised |
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Term
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Definition
| the family of polymers that cannot be melted and can be easily stretched without damage |
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Term
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Definition
| a test that involves bending a rectangular beam of a material |
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Term
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Definition
| refers to the portion of a reacting thermoset resin system that is attached to the infinite network |
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Term
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Definition
| the value of the degree of cure of a thermoset resin system at the point of gelation |
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Term
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Definition
| the time required for a freshly mixed thermoset resin system to reach gelation for a given temperature exposure |
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Term
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Definition
| the incipient formation of a 3-D covalently bonded network structure |
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Term
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Definition
| the state that amorphous polymers are in during the onset of long-range coordinated molecular motion, which leads to a material with leathery characteristics |
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Term
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Definition
| an amorphous material or polymer with no long-range molecular motion, which leads to a material that is stiff and brittle |
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Term
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Definition
| the total amount of heat released from a freshly mixed thermoset resin system from 0-100% cure |
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Term
| High Perfoemance Thermoset Polymer |
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Definition
| a network polymer suitable for a) high temperature service and/or b) high mechanical loads (structural applications). |
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Term
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Definition
| the equation that shows the relationship between stress and strain in an elastic solid |
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Term
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Definition
| refers to testing performed on samples that have first been moisture saturated, usually in a humidity cabinet at high temperature and high humidity |
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Term
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Definition
| analytical technique used to determine the types and amounts of organic bonds in a material |
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Term
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Definition
| the phase that binds the reinforcement together in a composite material |
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Term
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Definition
| this term is synonymous with the stiffness or rigidity of a material; mathematically it is equal to the slope of the stress vs. strain curve in the elastic region |
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Term
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Definition
| a simple organic compound that can react with itself or other simple compounds to form a polymer |
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Term
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Definition
| the number of covalent bonds that a reactive monomer can form with other monomers |
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Term
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Definition
| the family of polymers that includes both thermosets and elastomers |
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Term
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Definition
| the general term for the chemical reaction of monomers to form a polymer |
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Term
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Definition
| refers to the portion of a reacting thermoset resin system that is comprised of low or moderate molecular weight materials that are not attached to the network |
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Term
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Definition
| the name of the major class of polymerization reactions which involves linking together of monomers with "simple" chemical reactions such as acid+base. The resulting polymers have main chains that usually contain heteroatoms such as O and N |
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Term
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Definition
| the amount that a a material deforms per unit length in a tensile test |
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Term
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Definition
| the maximum strain achieved before fracture in a mechanical test |
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Term
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Definition
| the maximum stress achieved before fracture in a mechanical test |
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Term
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Definition
| the applied load or force divided by the original cross sectional area of the material in a tensile test |
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Term
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Definition
| the term used to describe the mixture of monomers and other chemicals needed to form a thermoset polymer |
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Term
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Definition
| the glass transition temperature of a moisture-saturated polymer |
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Term
| Thermochemical Analysis (TMA) |
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Definition
| an analytical technique that measures the linear expansion of a material as the temperature is raised |
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Term
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Definition
| the family of polymers that can be melted |
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Term
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Definition
| the family of polymers that cannot be melted with the highest stiffness and chemical stability |
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Term
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Definition
| a mechanical property that is synonymous with damage tolerance, resistance to fracture, impact resistance, etc. It most fundamentally relates to resistance to crack propagation |
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Term
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Definition
| the ratio of transmitted to incident light intensity in an infrared spectrometer |
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Term
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Definition
| simultaneously exhibiting the properties of an elastic solid and viscous material |
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Term
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Definition
| the conversion of a high viscosity liquid or semi-solid into a glassy amorphous solid |
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