Calculate the number-average molar mass and the weight-average molar mass of a mixture of equal amounts of two polymers of molar mass 82 kg mol-1, and 108 kg mol-1.
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Calculate the number-average molar mass and the weight-average molar mass of a mixture of equal amounts of two
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- Calculate the number-average molar mass and the weight-average molar mass of a mixture of equal amounts of two polymers, one having M = 62 kg mol−1 and the other M = 78 kg mol−1.Calculate the number-average molar mass and the weight-average molar mass of a mixture of two polymers, one having M = 62 kg mol−1 and the other M = 78 kg mol−1, with their amounts in moles in the ratio 3:2.Determine the dispersity of a sample of a synthetic polymer with number-average molar mass 36 kg mol-1 and weight-average molar mass 124 kg mol1.
- The table below gives the fraction of molecules of a polymer sample having a given averagemolecular weight. Calculate the number average molecular weight, Mn and the weight averageMW, Mw.The radius of gyration of a three-dimensional partially rigid polymer of 1000 units each of length 150 pm was measured as 2.1 nm. What is the persistence length of the polymer?relation between melting temperature Tm and maximum crystallization temperature of polymer
- synthetic ion exchange resins. These resins are organic polymeric networks that contain functional groups that are permanently attached to the resin. One such functional group is sulfonic acid, -SO3H. When placed in water, the resin (being a large organic molecule) will not dissolve. However, the ionic functional groups become hydrated and the resin will swell as it takes up waters of hydration. The resin may then be thought of as a solid solution mixture with the functional groups being "dissolved" but the polymer remaining as a solid. The hydronium ion (H3O+) associated with acidic functional groups like sulfonic acid will dissociate just as it would if the acid were free of the resin. If other cations such as Cu2+ or Na+ are added to the resin, an ion-exchange reaction can occur: . Note that one H+ is released for each positive charge bound to the resin. Since the resin exchanges a hydrogen ion for a sodium ion in this reaction, sulfonic acid resins are called cation-exchange…Poisson’s ratio for polyethene is 0.45. What change in volume takes place when a cube of polyethene of volume 1.0 cm3 is subjected to a uniaxial stress that produces a strain of 1.0 per cent?Distinguish between number-average and weight-average molar masses. Why might they differ?