6. Polymer Structure Crystallinity

What is the temperature at which the transition occurs between the glassy and rubbery states of a polymer?

• Tm

• Tg

• Tc

• Ts

Which type of polymer behavior is characterized by being hard and rigid at room temperature?

• Rubbery

• Glassy

• Crystalline

• Amorphous

What is the glass transition temperature of Polyethylene?

• -125°C

• 69°C

• 28°C

• -20°C

What structural feature of a polymer influences the value of Tg?

• Time

• pH Level

• Temperature

• Chain Length

Which method is used to study the transitions in polymers conveniently?

• Titration

• Chromatography

• Spectroscopy

• Differential Scanning Calorimetry

What is the process of breaking down intermolecular bonds of starch molecules in the presence of water and heat called?

• Hydrolysis

• Gelatinization

• Denaturation

• Coagulation

Which type of starch contains branched chains of alpha-D-glucose monomers?

• Amylose

• Amylopectin

• Lignin

• Cellulose

What happens to the starch granules when heated in water above 50 degrees Celsius?

• They solidify

• They dissolve

• They remain unchanged

• They shrink

What is the temperature at which starch granules rapidly swell and yield a thickened paste known as?

• Freezing Point

• Gelatinization Temperature

• Boiling Point

• Melting Point

Which factor affects the gelatinization of starch by competing with starch for water?

• Fat

• Protein

• pH Level

• Sugar