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
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
Related questions
Question
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
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
Step by step
Solved in 3 steps with 3 images
Recommended textbooks for you
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…
Chemical Engineering
ISBN:
9781118431221
Author:
Richard M. Felder, Ronald W. Rousseau, Lisa G. Bullard
Publisher:
WILEY
Elements of Chemical Reaction Engineering (5th Ed…
Chemical Engineering
ISBN:
9780133887518
Author:
H. Scott Fogler
Publisher:
Prentice Hall
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…
Chemical Engineering
ISBN:
9781118431221
Author:
Richard M. Felder, Ronald W. Rousseau, Lisa G. Bullard
Publisher:
WILEY
Elements of Chemical Reaction Engineering (5th Ed…
Chemical Engineering
ISBN:
9780133887518
Author:
H. Scott Fogler
Publisher:
Prentice Hall
Industrial Plastics: Theory and Applications
Chemical Engineering
ISBN:
9781285061238
Author:
Lokensgard, Erik
Publisher:
Delmar Cengage Learning
Unit Operations of Chemical Engineering
Chemical Engineering
ISBN:
9780072848236
Author:
Warren McCabe, Julian C. Smith, Peter Harriott
Publisher:
McGraw-Hill Companies, The