Hydrogels and Advanced Formulations

Question 1

Hydrogel characteristics

Answer 1

3D, hydrophilic cross-linked polymer network. Hold lots of water, behave like liquid and solid

Question 2

Ideal hydrogel

Answer 2

Absorbency, low soluble, low residual, cheap, durable, stable, biodegradable, photo stable, neutral pH, re-wettable

Question 3

Hydrogel classifications

Answer 3

Preparation, cross-linking, source, charge, response, physical aspect, structure, degradability

Question 4

Preparation types of hydrogels

Answer 4

Interpenetrating network, homopolymer, co polymer

Question 5

IP hydrogels

Answer 5

homo and copolymers combined with cross linking agent

Question 6

Homopolymer

Answer 6

made of singular type of monomer

Question 7

Copolymer

Answer 7

made of multiple different types of monomers

Question 8

Cross-linking types of hydrogels

Answer 8

physical or chemical

Question 9

Physical cross-linking

Answer 9

intermolecular forces, H-bonding or ionic bonds hold together. Weaker, reversible, less stable

Question 10

Chemical cross-linking

Answer 10

bonded covalently. Stronger, irreversible, stable, require initiator

Question 11

Charge types of hydrogels

Answer 11

anionic, cationic, amphoteric, nonionic

Question 12

Response types of hydrogels

Answer 12

chemical, physical, biochemical

Question 13

Structural types of hydrogels

Answer 13

amorphous, semi-crystalline

Question 14

Physical aspect types of hydrogels

Answer 14

gel and film, matrix, particles

Question 15

Types of hydrogel synthesis

Answer 15

bulk, suspension, photo, solution

Question 16

Bulk polymerisation

Answer 16

simple and pure, pure monomer and initiator, no solvent, few additives. hard to temp control

Question 17

Suspension polymerisation

Answer 17

monomer and initiator mix dropped into solvent and forms beads suspended in solvent

Question 18

Photo polymerisation

Answer 18

in situ, light induced polymers. Initiator is light sensitive. Used in 3D printing

Question 19

Solution polymerisation

Answer 19

ionic or neutral monomers mixed into solvent and cross linker, initiated with UV.

Question 20

Hydrogel applications

Answer 20

nappies, breast implants, cell technology, face masks

Question 21

Additive manufacturing

Answer 21

3D printing where objects are formed from depositing, joining or solidifying materials under computer control

Question 22

SLA

Answer 22

stereolithography 3D printing using photo polymerisation

Question 23

FDM

Answer 23

fused deposition model, layers of plastic form object