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hw_12sol - 3.091 Fall Term 2004 Homework#12 page 2...

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3.091 Fall Term 2004 Homework #12 page 2 Homework #12 Solution Outlines Poly-8. The molecular weight of the monomer (–C 2 H 4 ) is 28 amu. The molecular weight range is: 500 (28) to 50,000 (28) = 14,000 amu to 1,400,000 amu Poly-9. The molecular weight of the monomer (–C 8 H 8 –) is 104 amu. 200,000 amu 300,000 amu chain = 1.92 × 10 3 monomers and chain = 2.88 × 10 3 monomers amu chain 104 amu chain 104 monomers monomers 1. (a) atactic: Cl 2 H C C H H C H C CH C H 2 C H 2 Cl Cl Cl isotactic: H C C H H C C H H C C H 2 2 2 H C Cl Cl Cl Cl syndiotactic: Cl Cl H C H C CH CH C H 2 C H 2 C H 2 Cl Cl (b) mol. wt. monomer = 2 × 12.011 = 24.022 3 × 1.00794 = 3.0238 1 × 35.4527 = 35.4527 4000 mers = 2.500 × 10 5 g/mol 2. (a) – linear is HDPE – straight chains pack better (b) HDPE straight chains are capable of some degree of crystallization interface between amorphous and crystalline material scatters visible light white appearance.
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3.091 Fall Term 2004 Homework #12 page 3 (c) semi-crystalline nature of HDPE adds rigidity LDPE is more flexible
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