פולימרים

Free radical polymerization of some vinyl polymers can give polymer chains with syndiotactic placement of monomers in the chain, under which of the following conditions, (Choose from the following four possibilities)

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מיין לפי

Group transfer polymerization is similar to which of the following polymerization processes with respect to the ratio of number average molecular weight to weight average molecular weight (Mn/ Mw) it can achieve?

1

מיין לפי

Group transfer polymerization is similar to which of the following polymerization processes with respect to the MW homogeneity it can achieve?

1

מיין לפי

Living polymerization processes refers to which of the following types of polymerization?

1

מיין לפי

Mechanical properties measured by the tensile modulus (stress/strain) as a function of temperature which of the following statements is correct? (Choose from the following four possibilities)

1

מיין לפי

Mixtures of polymers are called blends. Which of the following is a true about the difference between miscible and non miscible blends? (Choose from the following four possibilities) .

1

מיין לפי

Natural rubber, Hevea is sticky, elastic and a mechanically weak polymer while Gutta-percha is harder and more non-elastic. Both are made of exactly the same monomer material (isoprene) and have the same chemical composition. What is the best explanation for their different properties?

1

מיין לפי

Nylon can be made from the ring opening polymerization of a lactam (molecular weight 148) or the condefisation polymerization of an amino alkyl carboxylic acid (molecular weight 198), [fin both cases the resulting polyamide nylon has a number average molecular weight of 45,000 what is the average degree of polymerization DP of each polymer. (Choose from the following four possibilities)

1

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Nylon 6 can be made from the ring opening polymerization of caprolactam (molecular weight 113) or the condensation polymerization of 6 —aminohexanoic acid (molecular weight 131). If in both cases the nylon 6 has a number average molecular weight of 21,000 what is the average degree of polymerization DP of each polymer. (Choose from the following four possibilities)

1

מיין לפי

Of the following statements on polymer molecular parameters affecting chain flexibility and thus Tg which one is not correct: (Choose from the following four possibilities)

1

מיין לפי

Discuss, Learn and be Happy דיון בשאלות

Free radical polymerization of some vinyl polymers can give polymer chains with syndiotactic placement of monomers in the chain, under which of the following conditions, (Choose from the following four possibilities)

Group transfer polymerization is similar to which of the following polymerization processes with respect to the ratio of number average molecular weight to weight average molecular weight (Mn/ Mw) it can achieve?

Group transfer polymerization is similar to which of the following polymerization processes with respect to the MW homogeneity it can achieve?

Living polymerization processes refers to which of the following types of polymerization?

Mechanical properties measured by the tensile modulus (stress/strain) as a function of temperature which of the following statements is correct? (Choose from the following four possibilities)

Mixtures of polymers are called blends. Which of the following is a true about the difference between miscible and non miscible blends? (Choose from the following four possibilities) .

Natural rubber, Hevea is sticky, elastic and a mechanically weak polymer while Gutta-percha is harder and more non-elastic. Both are made of exactly the same monomer material (isoprene) and have the same chemical composition. What is the best explanation for their different properties?

Of the following statements on polymer molecular parameters affecting chain flexibility and thus Tg which one is not correct: (Choose from the following four possibilities)