It is a repeating unit in the polymer. Neglecting contributions from end groups, calculate the number average degree of polymerization of this sample Assuming that the sample has a molar mass dispersity of 1.5, calculate its weight average molar mass. Ex: calculate the degree of polymerization of a sample of polyethylene [ (CH 2-CH 2) n], which has a molecular weight of 150,000 g/mol. 1,89 x 104 Note In the case of polymer with an unknown molecular mass, the extinction coefficient is reported as the mole of the repeating unit. The properties of polymers are strongly influenced by details of the chain structure. ENGR 2300 Chapter 15 15 Terms. 7.1 A high-molecular-weight polyethylene has an average molecular weight of 410,000 g/mol. what is it weight average degree of polymerization. ... chain like molecule made up of repeating units joined end to end. What is the time on the when last sample breaks ( ±5 s)? 300 – 200 nm. A repeat unit is sometimes called a mer or mer unit. 2b), on the other hand, a weak +12 m/z peak series (C series) relative to the U series is the only side product.This C series is assigned as the PS terminated by radical–radical coupling during the polymerization (C 23 = 2648.4 m/z (Na +)).In fact, the C series is also present in the mass spectrum obtained with AgTFA (Fig. A polymer has a number average molecular weight of 100,000 g/mol a PDI of 5 and the mass of its repeat unit is 206 g/mol. flicka7. = 2.55 s Abstract Polystyrene is hard but brittle thermoplastic, less flexible and ductile at room temperature than Polyethylene because the phenyl group in its repeating unit increases the strength of intermolecular forces present in crystalline due to its weak polarity. The word polymer is derived from the classical Greek words poly meaning “many” and meres meaning “parts.” Simply stated, a polymer is a long-chain molecule that is composed of a large number of repeating units of identical structure. What is its average degree of polymerization? EPF is a linear polymer whose basic unit is styrene (C 8 H 8 ) and whose molecular mass is 104, yet when it is linked together as it is in the plastic, its mass can range between 200,000 and 300,000 (because a polymer chain can contain an indefinite number of molecular links, a terminal mass … whaat is its number average degree of polymerization? "Mer" originates from the Greek word "meros," which means a part. To assess the average degree of polymerization (DP), the mass of the polyethylene mer is first calculated: (4 hydrogen atoms × 1 g/mol) + … surface tension. These details include the overall chemical composition and the sequence of monomer units in the case of copolymers, the stereochemistry or tacticity of the chain, and the geometric isomerization in the case of diene-type polymers for which several synthesis routes may be possible. Polymer is a term used to describe large molecules consisting of repeating structural units (monomers) connected by covalent chemical bonds. ... TE 200 Exam 1 24 Terms. a single chemical compound or element that is found in nature. Polymer. wrs41. When lots of monomers are joined together by covalent bonds, they form a polymer. The word polymer derives its meaning from this, which means "many mers." M is the molecular weight of the polymer, DP is the degree of polymerization and the M 0 is the formula weight of the repeating unit. Table 2.1 UV Absorption Reagent ε 215 nm / mol-1 dm3 cm-1 ε 272 nm / mol-1 dm3 cm-1 Poly(methyl methacrylate) 1.7 x 102 1.5 Cinnamic acid ? 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