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5. The average molecular weight of a sample of PMMA (Figure 6.8) is 75 650. What is the degree of polymerization for the specimen?

5. The average molecular weight of a sample of PMMA (Figure 6.8) is 75 650. What is the degree of polymerization for the specimen?

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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**5.** The average molecular weight of a sample of PMMA (Figure 6.8) is 75,650. What is the degree of polymerization for the specimen? *Note to Educators: Ensure students understand the concepts of molecular weight and the degree of polymerization, and how to calculate the latter using the given data.*
Transcribed Image Text:**5.** The average molecular weight of a sample of PMMA (Figure 6.8) is 75,650. What is the degree of polymerization for the specimen? *Note to Educators: Ensure students understand the concepts of molecular weight and the degree of polymerization, and how to calculate the latter using the given data.*
--- **Common Polymeric Biomaterials** **Figure 6.8** *Chemical structure of polymethylmethacrylate (PMMA).* The opacifier is added to make the bone cement visible under X-ray imaging. At times, antibiotics can be mixed with the PMMA to fight infections. The liquid component contains the MMA monomer and toluidine, which is an accelerator. The latter is increased by the breakdown of the dibenzoyl peroxide and the production of free radicals. When the solid and liquid components are mixed, the initiator, dibenzoyl peroxide, produces free radicals which drive the polymerization process. The polymerization reaction is exothermic in nature. --- **Explanation of the Chemical Structure Diagram:** The diagram illustrates the chemical structure of PMMA. The structure consists of repeating units (as indicated by the bracket and subscript "n"), each containing a backbone chain of carbon atoms. Attached to the main chain are methyl groups (CH₃) and ester groups (O=C-OCH₃), characteristic of PMMA.
Transcribed Image Text:--- **Common Polymeric Biomaterials** **Figure 6.8** *Chemical structure of polymethylmethacrylate (PMMA).* The opacifier is added to make the bone cement visible under X-ray imaging. At times, antibiotics can be mixed with the PMMA to fight infections. The liquid component contains the MMA monomer and toluidine, which is an accelerator. The latter is increased by the breakdown of the dibenzoyl peroxide and the production of free radicals. When the solid and liquid components are mixed, the initiator, dibenzoyl peroxide, produces free radicals which drive the polymerization process. The polymerization reaction is exothermic in nature. --- **Explanation of the Chemical Structure Diagram:** The diagram illustrates the chemical structure of PMMA. The structure consists of repeating units (as indicated by the bracket and subscript "n"), each containing a backbone chain of carbon atoms. Attached to the main chain are methyl groups (CH₃) and ester groups (O=C-OCH₃), characteristic of PMMA.
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