Polymer Synthesis &

MW

Viscoelasticity & Rheology

$100 $100 $100$100$100

$200 $200 $200$200$200

$300 $300$300$300$300

$400 $400$400$400

$500 $500$500$500

Potpourri Polymer Crystallinity

$400

$500

Chemical Structure &

FTIR

Final Jeopardy!!!

Category:

Time-temperature-superposition

Final Jeopardy

This equation can be used to determine the temperature

shift factor in the range Tg<T<(Tg+100C)

What is ….. (write out the equation)

Final Jeopardy

WLF Equation

*

2

*1log

TTC

TTCaT

Polymer Synthesis & MW For $100

Two ways that polymers can be characterized based on their

chemistry of synthesis.

What are ...

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Condensation and Addition

Polymer Synthesis & MW For $200

Five different ways that average molecular weights can

be measured

What are ...

•End group analysis

•Colligative property measurements (membrane osmometry)

•Light scattering

•Ultracentrafuge

•Dilute-solution viscosity

•Size-Exclusion Chromatography

•MALDI-TOF mass spec.Back toGame

Polymer Synthesis & MW For $300

For a given polydisperse polymer system, list number average MW, weight average MW, and viscosity average MW in order of increasing

magnitude.

What is ...

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wn MMM

Polymer Synthesis & MW For $400

What is ...

This is what MALDI-TOF mass spec stands for.

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MALDI-TOF mass spec:

Matrix Assisted Laser Desorption/Ionization – Time of Flight Mass Spectroscopy

These are the three major stages that control addition

polymerization

What are ...

Polymer Synthesis & MW For $500

1. Initiation2. Propagation3. Termination

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Three common spectroscopic

methods

What is ...

Chemical Structure & FTIR For $100

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1. Infrared Spectroscopy (FTIR)

2. Raman Spectroscopy

3. Nuclear Magnetic Resonance (NMR) Spectroscopy

List three of the six“Types of Molecular Vibration”

measured with FTIR and act them out.

What are ...

Chemical Structure & FTIR For $200

Bond Stretching1. Symmetric2. Asymmetric

Bond Bending1. In-plane rocking2. In-plane scissoring3. Out-of-plane wagging4. Out-of-plane twisting

Bond Stretching Bond Bending

symmetric

asymmetric

In-plane rocking

In-plane scissoring

Out-of-plane wagging

Out-of-plane twisting

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What two functional groups combine to make a nylon linkage

What are ...

Chemical Structure & FTIR For $300

di-acid and di-amine

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Amine Functional

Groups

hexamethylenediamine

Cl Cl

Adipoyl chloride

In the FTIR lab, the polymer is cast onto this

material because it is transparent to IR.

What are ...

Chemical Structure & FTIR For $400

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KBr glass

What is ...

Chemical Structure & FTIR For $500

Come to the board and draw the chemical structure for PS, PMMA, PEG, and LDPE (the four polymers

analyzed in the FTIR lab).

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Potpourri For $100

List three instruments that can be used to measure Tg,

and what property changes with each

What are...

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DSC – Step change in heat capacity at Tg

DMA – Storage modulus drop or peak in tan delta and loss modulus

TMA – Step change in CTE (or change in slope of Volume vs Temp) at Tg

Potpourri For $200

List three of the six factors that influence Tg

What are ...

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1. Free Volume

2. Secondary Bonds between Molecules

3. Internal Mobility, freedom to rotate about bonds

4. Stiffness of the chains

5. Chain length (Mw)

6. Crosslinking

The name of this famous equation:

What is ...

PotpourriFor $300

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Bragg’s Law

The phenomenon in many thermoplastics where small (microscopic) crack-like

entities form in a direction perpendicular to the applied stress, giving an opaque or

“white” appearance to the material.

What is ...

Potpourri For $400

crazing

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Craze band in polystyrene

These are the two different types of DSCs

What are ...

Potpourri For $500

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1. Power compensated2. Heat flux

Polymer CrystallinityFor $100

The observation (by x-ray measurements) that the

polymer chains were aligned perpendicular to the large flat

faces of the crystals led to this conclusion.

What is ...

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The chain must fold back on itself

Polymer CrystallinityFor $200

Crystallites often aggregate into these supermolecular

structures

What are ...

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Sphereulites

Normal spherulite growth in the bulk proceeds until this occurs.

What is ...

Polymer CrystallinityFor $300

Impingement with another spherulite.

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What are...

Polymer CrystallinityFor $400

Name two artifacts in the POM image below.

Maltese cross

and

Ringed Pattern

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What is ...

The relationship between spherulite radius and time for isothermal crystalization.

Polymer CrystallinityFor $500

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Linear

Viscoelasticity & RheologyFor $100

The science of the deformation and flow of materials

What is ...

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Rheology

Viscoelasticity & RheologyFor $100

These fluids obey this law:

What are ...

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Newtonian Fluids

Viscoelasticity & Rheology(Daily Double)

This model for non-Newtonian Fluids is capable of predicting both the

upper and lower Newtonian behavior for Polymer melts and solutions

What is ...

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The Carreau model

Viscoelasticity & RheologyFor $400

This viscoelastic model does not exhibit permanent set on creep

recovery.

What is ...

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Voigt-Kelvin Element

Viscoelasticity & RheologyFor $500

Identify the types of materials on the flow curve below

What is ...

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N, Newtonian; P, pseudoplastic (shear thinning); B-P, Bingham plastic; D, dilatant (shear thickening)