Question 87 (part 2) · LDEK · Composites
Conversion ratio of monomer to polymer is significant for the filling durability, due to the essential influence on physical-mechanical properties of the composite material. Indicate the consequence of conversion:
1) giving the composite material dark yellow color;
2) composite material shrinkage;
3) decrease of the material’s volume;
4) increase of spreading of the material in the cavity at the last stage of polymerization.
Correct answer is:
2) composite material shrinkage;
3) decrease of the material’s volume;
4) increase of spreading of the material in the cavity at the last stage of polymerization.
Correct answer is:
- A. 1,2.
- B. 1,3.
- C. 1,4.
- D. 2,3.
- E. 3,4.
Hint
During polymerisation, van der Waals distances between monomers turn into shorter covalent bonds — what happens to the bulk of the material?
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