Polymer fundamentals Flashcards
1
Q
Examples of products in pharmacy that have polymers
A
- Drugs - can be suspending agenets and emulsifier
- Suspending agents
- Tablets
- Film-coatings
- Implants - drug incoperated in and slow release
- Dressings
- Adhesives - sticking plasters
2
Q
Polymer
A
- Specific type macromolecule composed of large numbers of atoms with high molecular weight. Are built up of repeating units of a monomer
3
Q
Homopolymer
A
- Linear with only one monomer that repeats that is unbranched
4
Q
Alternating Copolymer
A
- Regular arangement of altermating monomer arrangement
5
Q
Random copolymer
A
- Random sequence of monomers with no specific arrangement
6
Q
Block copolymer
A
- Still 2 diffrent types of monomers
- alternating but in blocks
- e.g. 3 monomer A and 3 monomer B
7
Q
Graft copolymer
A
- Long chain of monomer A with branched attachments of monomer B (blocks)
8
Q
Factors that effect the properties of polymers
A
- Functional group of the monomers in the polymer
- Arrangement of the monomer
- How polymer chains interact with eachother and the environment
9
Q
Block copolymer properties
A
- Can act as emulsifying or suspending agent
- Can have hydrophobic and hydrophilic end could act as a surfactant
- Hydrophorbic portion of polymener absorbed on the the surface of oil and hydrophilic floats in the continuous phase
10
Q
volcanisation
Cross linking
A
- Natural latex - liquid and sticky rubber which is poly isoprene (single long chain)
- Heat with sulpher to form supher bridges between the poly isoprene
11
Q
Low molecular weight polymers
A
- Water that exists in three different states with clear bounderies
- Polymer only exists in solid and liquid states (viscous)
12
Q
Factors that effect the dissolution of polymer
A
- Polarity
- Molecular weight - lengthh of polymer chain shorter more likely to dissolve
- Presence of crosslinkages - less likely to dissolve with cross links
- Crystaline and anamorphous form - order when crystaline less likely to dissolve
- Can be patially anamorphous
13
Q
Molecular weight and small polymers
A
- Fixed molecular weight whereas most do not (polydisperse)
- Average polymer molecular weight
- Bell shaped curve for polymer weight on graph with number of molecules on the x axis and molecular wight of single molecule
14
Q
Mn Number average polymer weight
A
- Number of moles that a specific molecular weight has times together add for each molecular weight
- Divide this by the total moles
15
Q
Mw Weight average molecular weight
A
- Weight that a specific molecular weight has times together add for each molecular weight
- Divide this by the total weight
