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MSE 2001 Exam 3
MSE 2001 Exam 3
11
Science
Undergraduate 2
04/16/2012

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Term
Tg
Definition
glass transition temperature
Lower cooling rate means lower Tg
Tg denotes the temperature where large-scale molecular motion is essentially prohibited.
is not a thermodynamic variable
Term
Tm
Definition
equillibrium transformation temperature (for crystals)
Term
Viscosity
Definition
mu = (initial mu) * e^(Q/RT) = 1/fluidity
Viscosity is a parameter that is used to describe the mechanical behavior above Tg
Term
Fluidity
Definition
flux = (initial flux)*e^(-Q/RT)
Term
Zachariasen’s Rules for Oxide Glass Formation
Definition
>Oxide glass networks are composed of oxygen polyhedra.
>Coordination of each oxygen atom in the glass network should be 2
>Coordination number of each metal atom in the glass network should be 3 or 4.
Term
Thermoplastics (TP)
Definition
>possible secondary bonds
between chains
Term
Thermoset (TS)
Definition
>cross-links between chains
Term
Polydispersity
Definition
Number average molecular weight/weight average molecular weight
PD = 1 corresponds to molecules that all have the same weight
Term
Rubber elasticity
Definition
Length_ext = m*l*sin(theta/2)
Term
Bond Force Curve
Definition
xo is the equilibrium separation distance
d is the displacement necessary to
cause the atoms to fly apart
Term
Elastomers
Definition
can be stretched to many times
their original length and recover essentially
completely
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