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It is intended to toughen poly(methyl methacrylate) (PMMA) by the addition of particles of rubbery poly[(n-butyl acrylate)-co-styrene] made by emulsion polymerization. In order to retain the good optical clarity of the PMMA, it is necessary to match the refractive indi- ces ñ of the PMMA and copolymer particles. Estimate the relative proportions of the two comonomers required in the particles given that at room temperature the refractive indices of the homopolymers are PMMA, 1.489; poly(n-butyl acrylate), 1.466; and polystyrene, 1.591. Would you expect the material to retain its clarity if the temperature were changed from ambient?

It is intended to toughen poly(methyl methacrylate) (PMMA) by the addition of particles of rubbery poly[(n-butyl acrylate)-co-styrene] made by emulsion polymerization. In order to retain the good optical clarity of the PMMA, it is necessary to match the refractive indi- ces ñ of the PMMA and copolymer particles. Estimate the relative proportions of the two comonomers required in the particles given that at room temperature the refractive indices of the homopolymers are PMMA, 1.489; poly(n-butyl acrylate), 1.466; and polystyrene, 1.591. Would you expect the material to retain its clarity if the temperature were changed from ambient?

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Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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16.2 It is intended to toughen poly(methyl methacrylate) (PMMA) by the addition of particles of rubbery poly[(n-butyl acrylate)-co-styrene] made by emulsion polymerization. In order to retain the good optical clarity of the PMMA, it is necessary to match the refractive indi- ces ñ of the PMMA and copolymer particles. Estimate the relative proportions of the two comonomers required in the particles given that at room temperature the refractive indices of the homopolymers are PMMA, 1.489; poly(n-butyl acrylate), 1.466; and polystyrene, 1.591. Would you expect the material to retain its clarity if the temperature were changed from ambient?
Transcribed Image Text:16.2 It is intended to toughen poly(methyl methacrylate) (PMMA) by the addition of particles of rubbery poly[(n-butyl acrylate)-co-styrene] made by emulsion polymerization. In order to retain the good optical clarity of the PMMA, it is necessary to match the refractive indi- ces ñ of the PMMA and copolymer particles. Estimate the relative proportions of the two comonomers required in the particles given that at room temperature the refractive indices of the homopolymers are PMMA, 1.489; poly(n-butyl acrylate), 1.466; and polystyrene, 1.591. Would you expect the material to retain its clarity if the temperature were changed from ambient?
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