The immiscible blends exhibit_______

Polymer Solutions

Quiz
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Other
•
University
•
Hard
Inmaculada García
Used 2+ times
FREE Resource
9 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Excellent mechanical properties
Poor mechanical properties
Poor chemical properties
Intermediate chemical properties
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
1. For amorphous and semi-crystalline polymers, mixing leads to the formation of____
Mechanical blends
Solution-cast blends
Solution-cast blends
Chemical blends
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Polymers are dissolved in common solvent to give
Chemical blends
Latex blends
Solution-cast blends
Mechanical blends
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
1. The physical mixture of two or more polymers that are not linked by covalent bonds is called
Polymerisation
Dendrimer
Polyblend
Multiblend
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the thermodynamic relation frequently used by chemists to determine if a reaction will be spontaneous?
The Boltzmann Relation
The Gibbs free energy equation
The First Law of Thermodynamics
Go ask Jerry Falwell
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
1. Are most blends of polymers miscible in the absence of strong interactions, such as hydrogen bonds?
Yes
No
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why are most blends of polymers immiscible?
The enthalpy of mixing two polymers is often a large, positive number
There is a large decrease in the entropy of the system
There is a very little entropy gained by mixing two polymers and they often have a positive enthalpy of mixing
The ghost of Paul Flory hates miscible blends and makes most of them immiscible
8.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What USUALLY happens to the mechanical and optical properties of a polymer blend if the components show a significant degree of immiscibility and there is no compatibilizer?
The properties display a synergistic increase
The properties are often poor
Phase separation does not affect these properties
9.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
There are several methods of measuring the glass transition(s) of a polymer blend, such as DSC and DMA. How many glass transitions would you expect to see in two component miscible polymer blend? How many glass transitions would you expect to see in a two component immiscible blend (with significant phase separation)?
One broad glass transition in the miscible blend and two glass transitions in an immiscible blend
One broad glass transition in the immiscible blend and two glass transitions in an miscible blend
Two glass transitions, regardless of whether there was phase separation or not
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