Question

Vice Canada Ap. Two polymers are comprised of the same monomer. Their product labels indicate information about the molecular weight and melting temperature: 10 pts Molecular weight Polymer 1 Melting temperature Polymer 2 425 g/mol 390 g/mol Degree of branching 190°C 260°C (not given on product label) (not given on product label) 1 (4 marks) How does the degree of branching compare in Polymer 1 versus Polymer 2, given the observed difference in melting temperatures? Justify your answer, with reference to underlying mechanisms. 2.(4 marks) How do the ductility of Polymer 1 and 2 compare? Explain your answer fully, with reference to underlying mechanisms, 3.(2 marks) Determine the degree of polymerization (DP) for Polymer 1 and 2. Show your work and explain your answer, where appropriate. B I Y A.

Answer 1

Page No Page 1 3 Degree of polymeçilchón 2 molecular weight a polymer molely! weight of monomer From which polymee is prepared 1 Plumer properties Strongly dependent up on the molecules distribution pothularly the amount of bronching of side branches are short then it is having low Castellining and is side bronchey are longe then iris having high custollining because they are able to form lamellat (2453 e there own. Typically have the branching meens hishe the density and the sofrer and shenges the polymes. As the second polymee ie (polymee 2) is having high melting temperature means it is having high crystallinity and also having high degree q bronching thon polymer 1 Hefe, they have not given moleculcı weight of monomee but they have said that the two polymees are comprised of some monemei. suppose we will conside the meciul weight a minute is 76 ms. (propylene glycol os monomen I for 1 polymer Dp: 5:59 for polymer 2 Ape s : 132 As the molecular weight is high for polymer 2, degree of -polymeεization is high in this polymer than polymee 2 Duchlin of_polymer is mainly dependent on rectees Such as (sto! Structure, Coustel whickness degree of Custollinis kemperature, yate of deformchon, Stress rate etc. A loues moleculez Leight and high temperature polymer 2) increases mobility of_polymee chain due to level packing density, which in tum increases the Lendency of polymer to yield under stress but it also decseases the mechanical strength. so, High srouin rate has the same effect on mechanical propecties as a lower temperature, In other words we con se, high Shrain roles promule britle fracture and low strain rate promote ductile Fracture. so we cansoy polymer 1 con promote less ductility than polymer 2.