Homework Help is Here – Start Your Trial Now!
Engineering
Chemical Engineering
Studru 4.50 A polymeric material is being considered as a coating film to protect an optical storage disk from water vapor damage. Suppose we need to protect a disk surface from an ambient me- dium that will be at 40% relative humidity at 21°C. How thick must the film be if the concen- tration at the disk/protective film interface is to be below 0.01 wt% water in the film, for a period of 5 years? The film density is 1.224 g/cm³. At 100% relative humidity (at 21°C) the equilibrium uptake of water in the film is 5.4 wt %. The absorption isotherm for water in this polymer is linear. The diffusion coefficient of water in the film is 8.2 x 10-10 cm²/s.

Studru 4.50 A polymeric material is being considered as a coating film to protect an optical storage disk from water vapor damage. Suppose we need to protect a disk surface from an ambient me- dium that will be at 40% relative humidity at 21°C. How thick must the film be if the concen- tration at the disk/protective film interface is to be below 0.01 wt% water in the film, for a period of 5 years? The film density is 1.224 g/cm³. At 100% relative humidity (at 21°C) the equilibrium uptake of water in the film is 5.4 wt %. The absorption isotherm for water in this polymer is linear. The diffusion coefficient of water in the film is 8.2 x 10-10 cm²/s.

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
See similar textbooks
icon
Related questions
Question
Studru 4.50 A polymeric material is being considered as a coating film to protect an optical storage disk from water vapor damage. Suppose we need to protect a disk surface from an ambient me- dium that will be at 40% relative humidity at 21°C. How thick must the film be if the concen- tration at the disk/protective film interface is to be below 0.01 wt% water in the film, for a period of 5 years? The film density is 1.224 g/cm³. At 100% relative humidity (at 21°C) the equilibrium uptake of water in the film is 5.4 wt %. The absorption isotherm for water in this polymer is linear. The diffusion coefficient of water in the film is 8.2 x 10-10 cm²/s.
Transcribed Image Text:Studru 4.50 A polymeric material is being considered as a coating film to protect an optical storage disk from water vapor damage. Suppose we need to protect a disk surface from an ambient me- dium that will be at 40% relative humidity at 21°C. How thick must the film be if the concen- tration at the disk/protective film interface is to be below 0.01 wt% water in the film, for a period of 5 years? The film density is 1.224 g/cm³. At 100% relative humidity (at 21°C) the equilibrium uptake of water in the film is 5.4 wt %. The absorption isotherm for water in this polymer is linear. The diffusion coefficient of water in the film is 8.2 x 10-10 cm²/s.
Expert Solution
steps

Step by step

Solved in 3 steps with 3 images

SEE SOLUTIONCheck out a sample Q&A here
Blurred answer
Recommended textbooks for you
Introduction to Chemical Engineering Thermodynami…
Introduction to Chemical Engineering Thermodynami…
Chemical Engineering
ISBN:
9781259696527
Author:
J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:
McGraw-Hill Education
Elementary Principles of Chemical Processes, Bind…
Elementary Principles of Chemical Processes, Bind…
Chemical Engineering
ISBN:
9781118431221
Author:
Richard M. Felder, Ronald W. Rousseau, Lisa G. Bullard
Publisher:
WILEY
Elements of Chemical Reaction Engineering (5th Ed…
Elements of Chemical Reaction Engineering (5th Ed…
Chemical Engineering
ISBN:
9780133887518
Author:
H. Scott Fogler
Publisher:
Prentice Hall
Process Dynamics and Control, 4e
Process Dynamics and Control, 4e
Chemical Engineering
ISBN:
9781119285915
Author:
Seborg
Publisher:
WILEY
Industrial Plastics: Theory and Applications
Industrial Plastics: Theory and Applications
Chemical Engineering
ISBN:
9781285061238
Author:
Lokensgard, Erik
Publisher:
Delmar Cengage Learning
Unit Operations of Chemical Engineering
Unit Operations of Chemical Engineering
Chemical Engineering
ISBN:
9780072848236
Author:
Warren McCabe, Julian C. Smith, Peter Harriott
Publisher:
McGraw-Hill Companies, The
SEE MORE TEXTBOOKS