Polymer Synthesis & MW Viscoelasticity & Rheology $100 $200 $300 $400 $500 Potpourri Polymer...

Polymer Synthesis &

Viscoelasticity & Rheology

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Potpourri Polymer Crystallinity

Chemical Structure &

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

Polymer Synthesis & MW For $100

Two ways that polymers can be characterized based on their

chemistry of synthesis.

What are ...

Back toGame

Condensation and Addition

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

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

magnitude.

What is ...

Back toGame

wn MMM

What is ...

This is what MALDI-TOF mass spec stands for.

Back toGame

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 ...

1. Initiation2. Propagation3. Termination

Back toGame

Three common spectroscopic

methods

What is ...

Chemical Structure & FTIR For $100

Back toGame

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 ...

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

Back toGame

What two functional groups combine to make a nylon linkage

What are ...

di-acid and di-amine

Back toGame

Amine Functional

Groups

hexamethylenediamine

Adipoyl chloride

In the FTIR lab, the polymer is cast onto this

material because it is transparent to IR.

What are ...

Back toGame

KBr glass

What is ...

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

analyzed in the FTIR lab).

Back toGame

Potpourri For $100

List three instruments that can be used to measure Tg,

and what property changes with each

What are...

Back toGame

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 ...

Back toGame

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

Back toGame

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

Back toGame

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 ...

Back toGame

The chain must fold back on itself

Crystallites often aggregate into these supermolecular

structures

What are ...

Back toGame

Sphereulites

Normal spherulite growth in the bulk proceeds until this occurs.

What is ...

Impingement with another spherulite.

Back toGame

What are...

Name two artifacts in the POM image below.

Maltese cross

Ringed Pattern

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What is ...

The relationship between spherulite radius and time for isothermal crystalization.

Back toGame

Linear

Viscoelasticity & RheologyFor $100

The science of the deformation and flow of materials

What is ...

Back toGame

Rheology

These fluids obey this law:

What are ...

Back toGame

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 ...

Back toGame

The Carreau model

This viscoelastic model does not exhibit permanent set on creep

recovery.

What is ...

Back toGame

Voigt-Kelvin Element

Identify the types of materials on the flow curve below

What is ...

Back toGame

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

Polymer Synthesis & MW Viscoelasticity & Rheology $100 $200 $300 $400 $500 Potpourri Polymer...

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