Quiz 1 Flashcards
For biomaterials belonging to the first generation, which of the following was their primary requirement to avoid adverse tissue reactions?
Bioactive
Bioinert
Biointeractive
None of the above
Bioinert
What is the key characteristic of vinyl monomers that allows them to form vinyl polymers?
They contain carbon-nitrogen double bonds
They contain carbon-oxygen double bonds
They contain carbon-sulfur double bonds
They contain carbon-carbon double bonds
They contain carbon-carbon double bonds
Arrange the following steps in the correct order for the path from the basic science of biomaterials to a medical device to clinical application.
Steps:
* Step A: Research on Biomaterials
* Step B: Preclinical and clinical testing
* Step C: Engineering to develop a medical device
* Step D: Commercialization and clinical application
* Step E: Regulatory approval
Step A → Step C → Step B → Step E → Step D
Which of the following is an example of a hydrocarbon polymer?
Polyvinyl Chloride
Polystyrene
Polyurethane
Nylon
Polystyrene
Which of the following does NOT describe Addition Polymerization?
The entire monomer molecule becomes part of the polymer
It includes the synthesis of polystyrene from styrene
It is also called step growth polymerization
It is also called chain growth polymerization
It is also called step growth polymerization
Arrange the following crosslink types in the correct order of bond strength in water:
Crosslink Types:
- Type A: Ionic
- Type B: Covalent
- Type C: Hydrogen bonding
- Type D: Hydrophobic effect
Type B > Type A > Type C > Type D
In a chemically cross-linked hydrogel, which of the following statements is NOT correct?
The polymer chains are connected by covalent bonds to form a network
They cannot swell significantly due to the retractive force of the crosslinked structure
They can maintain their original shape during and after swelling
They can be viewed as one molecule of large size or supramacromolecules
They cannot swell significantly due to the retractive force of the crosslinked structure
Which of the following properties does NOT belong to thermoset elastomers?
Cannot be reprocessed after curing
Highly durable and elastic
Permanent chemical crosslinking
Physical interactions through hydrogen bonding and crystallization
Physical interactions through hydrogen bonding and crystallization
What is the fundamental structural difference between thermoplastic
polyurethanes and thermosetting polyurethanes that leads to their distinct properties?
The presence or absence of covalent cross-links
Their ability to melt and flow when heated
The formation of crystalline or amorphous phases
Being recyclable and reprocessable
The presence or absence of covalent cross-links
Which of the following will most likely lead to a flexible polyurethane elastomer?
Using a chain extender to increase cross-linking
Using polyols with long chains and low functionality
Using triisocyanate instead of diisocyanate
Using polyols with high functionality instead of bi-functional polyol
Using polyols with long chains and low functionality
True or false: Intraocular lenses are classified as Class II medical devices by the FDA.
false
True or false: In general, increasing molar mass leads to more chain entanglements and an
increase in flowability.
false
True or false: Using cross-linkers is one of the ways to form physically cross-linked hydrogels.
false
True or false: The elasticity in elastomers is entropy-driven, meaning the chains stretch and align under force but naturally return to a disordered state when the force is removed to maximize entropy.
true
The formation of an alginate hydrogel with calcium chloride primarily occurs
through which of the following interactions?
Ionic bonding
Hydrophobic interactions
Covalent bonding
Hydrogen bonding
Ionic bonding
