D5: Basic polymer properties 1 Flashcards

1
Q

Define a macromolecule

A

molecules composed of a large number of atoms

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2
Q

Define a polymer

A

substance of high molecular weight consisting of repeating monomer unit

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3
Q

What are the 5 polymer structures?

A

1) homopolymer
2) alternating copolymer
3) random copolymer
4) block copolymer
5) graft copolymer

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4
Q

What is the use of simeticone?

A

defoaming agent used to relieve trapped wind/ bloating

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5
Q

What is the IUPAC name of simeticone?

A

polydimethylsiloxane

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6
Q

What polymer structure does simeticone take?

A

homopolymer

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7
Q

What depends on chemical reactivity of a polymer?

A

largely depends on the monomeric unit

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8
Q

What is the physical properties of polymers dependent on?

A

arrangement of monomers

how the polymer chains react with each other and/or environment

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9
Q

What is meant by polydisperse?

A

most synthetic and naturally occurring polymers don’t have an exact molecular weight

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10
Q

How is degree of polydispersity measured?

A

=Mw/Mn

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11
Q

What are the 7 techniques to characterise polymers?

A

1) light scattering techniques
2) viscosity and rheological techniques
3) analytical ultracentrifugation
4) gel electrophoresis
5) Nuclear magnetic resonance
6) differential scanning calorimetry DSC
7) gel permeation chromatography

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12
Q

What does light scattering techniques measure?

A

polymer molecular weight and hydrodynamic radius

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13
Q

What does viscosity & rheological techniques examine?

A

flow properties & polymer shape

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14
Q

How does analytical ultracentrifugation work?

A

separates polymers according to molecular weights

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15
Q

How does gel electrophoresis work?

A

separates polymers according to charge and molecular weight

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16
Q

What does DSC examine?

A

interactions between polymer chains (mp, glass transition temperatures

17
Q

How does gel permeation chromatography work?

A

separate polymers according to molecular weights