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MAT510 Midterm
High Performance Thermoset Polymers Vocabulary
47
Chemical Engineering
Graduate
02/07/2015

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Term
Absorbance
Definition
a quantity equal to the negative logarithm of the transmittance in an infrared spectrometer
Term
A-stage
Definition
the condition of a thermoset resin system in an uncured state
Term
B-stage
Definition
the condition of a thermoset resin system in a state of partial cure but prior to the gel point
Term
Chain Polymerization
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)
Term
Coefficient of Linear Thermal Expansion
Definition
the change in length of a material in one direction per unit length and unit change in temperature
Term
Composite
Definition
a synergistic mixture of two or more dissimilar materials that remain in different solid phases
Term
Crosslink Density
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
Term
Crosslink Junction
Definition
an atom that links 2 or more polymer chains together
Term
C-stage
Definition
the condition of a thermoset resin system in a state of advanced cure beyond the gel point
Term
Cure
Definition
the term used for polymerization of monomers that form a 3-D covalently bonded network
Term
Degree of Cure
Definition
mathematical quantity that describes how complete is the reaction of monomers based on the concentration of remaining reactive groups
Term
Differential Scanning Calorimetry (DSC)
Definition
an analytical technique that measures the net heat flow into a material as the temperature is raised
Term
Dynamic Mechanical Analysis (DMA)
Definition
an analytical technique that measures the mechanical response of a material to a small but oscillating stress as the temperature is raised
Term
Elastomer
Definition
the family of polymers that cannot be melted and can be easily stretched without damage
Term
Flexure Test
Definition
a test that involves bending a rectangular beam of a material
Term
Gel
Definition
refers to the portion of a reacting thermoset resin system that is attached to the infinite network
Term
Gel Point
Definition
the value of the degree of cure of a thermoset resin system at the point of gelation
Term
Gel Time
Definition
the time required for a freshly mixed thermoset resin system to reach gelation for a given temperature exposure
Term
Gelation
Definition
the incipient formation of a 3-D covalently bonded network structure
Term
Glass Transition
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
Term
Glassy Solid
Definition
an amorphous material or polymer with no long-range molecular motion, which leads to a material that is stiff and brittle
Term
Heat of Reaction
Definition
the total amount of heat released from a freshly mixed thermoset resin system from 0-100% cure
Term
High Perfoemance Thermoset Polymer
Definition
a network polymer suitable for a) high temperature service and/or b) high mechanical loads (structural applications).
Term
Hooke's Law
Definition
the equation that shows the relationship between stress and strain in an elastic solid
Term
Hot-wet Testing
Definition
refers to testing performed on samples that have first been moisture saturated, usually in a humidity cabinet at high temperature and high humidity
Term
Infrared Spectroscopy
Definition
analytical technique used to determine the types and amounts of organic bonds in a material
Term
Matrix
Definition
the phase that binds the reinforcement together in a composite material
Term
Modulus
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
Term
Monomer
Definition
a simple organic compound that can react with itself or other simple compounds to form a polymer
Term
Monomer Functionality
Definition
the number of covalent bonds that a reactive monomer can form with other monomers
Term
Network Polymer
Definition
the family of polymers that includes both thermosets and elastomers
Term
Polymerization
Definition
the general term for the chemical reaction of monomers to form a polymer
Term
Sol
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
Term
Step Polymerization
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
Term
Strain
Definition
the amount that a a material deforms per unit length in a tensile test
Term
Strain-to-Failure
Definition
the maximum strain achieved before fracture in a mechanical test
Term
Strength
Definition
the maximum stress achieved before fracture in a mechanical test
Term
Stress
Definition
the applied load or force divided by the original cross sectional area of the material in a tensile test
Term
Resin System
Definition
the term used to describe the mixture of monomers and other chemicals needed to form a thermoset polymer
Term
Tg, wet
Definition
the glass transition temperature of a moisture-saturated polymer
Term
Thermochemical Analysis (TMA)
Definition
an analytical technique that measures the linear expansion of a material as the temperature is raised
Term
Thermoplastic
Definition
the family of polymers that can be melted
Term
Thermoset
Definition
the family of polymers that cannot be melted with the highest stiffness and chemical stability
Term
Thoughness
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
Term
Transmittance
Definition
the ratio of transmitted to incident light intensity in an infrared spectrometer
Term
Viscoelastic
Definition
simultaneously exhibiting the properties of an elastic solid and viscous material
Term
Vitrification
Definition
the conversion of a high viscosity liquid or semi-solid into a glassy amorphous solid
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