21-40 questions

which statement about cross linked polymers is not true?

• cross linking causes polymers to stiffen and retain their shape

• cross linked polymers are thermoset plastics

• after cross linking polymers become very hard like epoxy

• cross linking makes polymers stronger and less reactive

the aggregate state is unusual for branched polymers

• all answers are correct

• liquid

• solid

• gas

cross linked polymer among the following is

• polyethylene

• melamine formaldehyde resin

• LDPE

• Nylon 6,6

which of the following types of polymers is a copolymer?

• network

• graft

• linear

• branched

What effect is used to determine whether a mixture is a real solution or a colloid?

• Brownian

• Coagulation

• Tyndall Effect

• Byju's Effect

The flexibility of branched macromolecules depends on the ...

• degree of branching

• compression ratios

• degrees of flexibility

• degree of fixation

Why polymer modification?

• to confirm if the correct material has been used in an application or to identify an unknown material

• allows for an accurate determination of solution concentrations of the analyte

• it is how plastics are made and many of our products contain plastics

• to impute different, typically desired properties to the new modified material

How many types of true solutions are there?

• Aerosols, Sols, Emulsion, Gel

• Solid-Liquid, Foam, Emulsion

• Liquid-Liquid, Solid-Liquid, Gas-Liquid

• Sol, Emulsion, Foam, and Aerosol

Why are natural polymers better than synthetic?

• allowing for lower power motors for moving parts due to lower frictional properties of polymer wear components compared to metals

• the low frictional properties provide for less wear as well

• different monomers can be mixed in various proportions resulting in a wide range of physical, mechanical, and chemical properties

• they show no adverse effects on the environment or human being

For cross-linked polymers, cross-linking makes sliding of molecules past one another easy; thus such polymers are soft.

• True

• False

• Information is not correct

• All answers are correct