4.1 A sample of atactic poly(vinyl alcohol) is known to have 60 wt% crystalline regions and 40 wt% amorphous regions. A. Draw the repeat structure of poly(vinyl alcohol), PVA? B. Is this polymer made by free radical or condensation polymerization? C. What type(s) of weak bonds would you expect to help with forming crystals in PVA? D. Copolymers of poly(vinyl acetate), PVAc, and poly(vinyl alcohol) are used in latex paints. What is the role of this copolymer in latex paint? (Use the internet- the Macrogalleria has a nice explanation; side note: Latex paints are commonly used for home interior painting) 60amatallinitu?
4.1 A sample of atactic poly(vinyl alcohol) is known to have 60 wt% crystalline regions and 40 wt% amorphous regions. A. Draw the repeat structure of poly(vinyl alcohol), PVA? B. Is this polymer made by free radical or condensation polymerization? C. What type(s) of weak bonds would you expect to help with forming crystals in PVA? D. Copolymers of poly(vinyl acetate), PVAc, and poly(vinyl alcohol) are used in latex paints. What is the role of this copolymer in latex paint? (Use the internet- the Macrogalleria has a nice explanation; side note: Latex paints are commonly used for home interior painting) 60amatallinitu?
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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Transcribed Image Text:4.1 A sample of atactic poly(vinyl alcohol) is known to have 60 wt% crystalline regions and 40 wt% amorphous regions.
A. Draw the repeat structure of poly(vinyl alcohol), PVA?
B. Is this polymer made by free radical or condensation polymerization?
C. What type(s) of weak bonds would you expect to help with forming crystals in PVA?
D. Copolymers of poly(vinyl acetate), PVAc, and poly(vinyl alcohol) are used in latex paints. What is the role of
this copolymer in latex paint? (Use the internet- the Macrogalleria has a nice explanation; side note:
Latex paints are commonly used for home interior painting)
E. Using equation 4.1, what is the density of the PVA with 60 wt% crystallinity?
The density of pure PVA crystals is 1.350 g/cm³, and for purely amorphous PVA is 1.291 g/cm³.
F. If the PVA were isotactic instead of atactic, discuss qualitatively how the crystallinity and density
would change.
G. Which structure would more likely be optically opaque- a random or block copolymer of PVA and PVAc?
Explain why.
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