Polymers and nanomats

Question 1

Polymer definition

Answer 1

macromolecules built up from monomers with average molar mass of at least 1000 or 100 repeat units

Question 2

Nanomaterial definition

Answer 2

Material with structural components that are between 1-100nm in at least 1 dimension

Question 3

Nanoparticles definition

Answer 3

Discrete particles between 1-100nm in all 3 dimensions

Question 4

Addition vs condensation monomer

Answer 4

Addition polymer has same empirical formula as monomer
C=C

Condensation polymers are elimination of small molecules of H2O or HCl
Must have 2 fn groups
Eg polyester, polyamide

Question 5

Thermoplastic vs thermosetting

Answer 5

Plastic softens upon heating, setting decomposes on strong heating

Plastic weak idid, setting strong covalent cross links

Question 6

LDPE vs HDPE polyethene

Answer 6

LDPE more flexible, lower strength, lower mp
LDPE branched chain structure

HDPE stiffer harder stronker, higher mp,
HDPE

Question 7

Polyester vs polyamide

Answer 7

Polyester no wrinkles
Polyamide has wrinkles because H bonds and hence high tensile strength

Question 8

Polypropene PP or PET?

Answer 8

PET can be alkaline hydrolysed so PP is better because it has alkane (inert)