In an A-A B-B step-growth polymerization reaction with an extent of reaction of p=0.999, 600 A-A monomers, 800 B-B monomers, and 71 B-R monofunctional monomers, what is the number average degree of polymerization?

What is the degree of polymerization for 1050 gr of average molecular weight of a polypropylene (C3H5)? C.12 gr/mole and H:1 gr/mole.

This polymer is composed of 2 monomer units: an acid chloride and an amine. In the box below, draw the structure of both monomers. (8-10 C (CH₂)6-C CH₂ 어 H n • You do not have to consider stereochemistry. • You do not have to explicitly draw H atoms. • Do not include lone pairs in your answer. They will not be considered in the grading. • Draw one structure per sketcher. Add additional sketchers using the drop-down menu in the bottom right corner. • Separate structures with + signs from the drop-down menu.

need help for question number 2

question 4 b)

Methyl methacrylate (or methyl 2-methylpropenoate in proper IUPAC nomenclature) is the starting material for the syntheses of poly(methyl methacrylate), also known as PMMA. The monomer is expressed as CH2=CH- COOCH3. Calculate the molecular weight of PMMA for which the degree of polymerization, n, is 5112. Express your answer in kilograms per mole. 0.10012 0.10012 Calculate the approximate stretched-out chain length of one of the chains, taking the C-C bond length to be 1.54 angstroms and ignoring the large side group's effect. Express your answer in microns. 45 45

7. When asymmetric alkenes polymerize (such as chloroethene to produce PVC), the pendant group like chlorine can be arranged in different ways. An arrangement in which the -Cl groups are arranged on the same side of the polymer chain is called a(n) , a. Atactic b. Isotactic arrangement. c. Syndiotactic d. Sporadic 8. Kevlar is a type of polymer which has a great resistance to tear. Its application includes its use in making bulletproof vests and radial tires. The two monomers used to make Kevlar are the following: H H H-O- c-0-H H-N- -N-H Monomer One Monomer Two When these two monomers join a. A molecule of CO2 will be eliminated and an ester linkage will form b. Nothing will be eliminated and the two monomers will be linked through a hydrogen to hydrogen bond c. A water molecule will be eliminated and a peptide linkage will be formed d. Nothing will be eliminated. The two monomers will be linked by a carbon-carbon bond.

Analysis of a sample of polyacrylonitrile shows that there are six lengths of chains, with the number of chains of each length shown in the table below. The molecular weight of the acrylonitrile monomer is 53 g/mol. Calculate the following: (a) The weight average molecular weight and degree of polymerization, (b) The number average molecular weight and degree of polymerization. Number Of chains Mean Molecular weight of chains (g/mol) 3010 10,005 18,005 17,005 15,005 6010 9010 12,010 9005 15,010 4005 18,010