Pva

1. POLYVINYL ALCOHOL
(POLYETHENOL)
By Manjot, Dilpreet and Benjamin
IUPAC name: poly(l-hydroxyethylene)
(C2 H4 O)n

2. General information
Polyethenol also known as Polyvinyl Alcohol is
generally known as PVA. It is most commonly used
in adhesive products and for making other
polymers.
Monomer
Polymer
Polyethenol Polymer
O
O O O O

3. Production
Unlike many vinyl polymers, Polyvinyl Alcohol
is not made via polymerization of the
corresponding monomer.
HydrolysisMethyl
Alcohol+
Vinyl
Alcohol
--------------->
Polyvinyl
Alcohol

4. Bonding Within Material
The relatively simple molecules of
this material bond using covalent
bonds and hydrogen interactions.
The mixture of these two bonds in
this material give it a relatively
high melting point of 230 °C and
also a relatively high boiling point
as a lot of energy is required to
overcome the large quantity of
bonds within this material.
- Intermolecular bond dissociation
enthalpy: 2366kJ/mol
- Hydrogen bond dissociation
enthalpy: 23kJ/mol
-
-

5. Other Physical Data
Relative Molecular Mass: 44g/mol
Flash Point: 79.44°c
Specific Gravity: 1.19-1.31
Density: 1.19-1.31 g/cm³
Solubility: Soluble In Cold Water, Hot Water
The material is pretty inert. It is not harmful, does
not react very much/easily and can be contained
with ease.

6. Some Uses of PVA
Polyvinyl alcohol has excellent film forming,
emulsifying, and adhesive properties.
It is resistant to oil, grease and solvent.
PVA is fully degradable and is a quick dissolver
Used in water transfer printing process
Used in eye drops and hard contact lens solution as
a lubricant
PVA fiber, as reinforcement in concrete

7. Explanations of Applications
Polyvinyl alcohol is used in eye drops because,
when eyes become dry due to a reduced
production of mucin by the conjunctiva, it reduces
the surface tension of the tears and also has similar
properties to the mucin.

8. Explanations of Applications 2
It is also used a water soluble film, the degradation of PVOH
is influenced by its crystalline structure and molecular weight.
The Hydrogens present in the Polyvinyl alcohol have a delta
plus charge meaning the delta minus charge on the oxygen
atom in a molecule of water will attract the delta positive
charge and will surround the hydrogen an cause the film to
break down.

9. Explanations of Applications 3
Polyvinyl alcohol is also used in PET bottles as a
carbon layer, because it helps the bottle when
thrown away, to degrade which means less rubbish
to deal with.

10. Explanations of Applications 4
When PVA is added to a Borax a bond between
the oxygen of the borax and the hydrogen of the
PVA forms (a hydrogen bond) this new formation
links the two substances together, forming a slime.
The slime is vicious because the hydrogen bonds let
the molecules slide over each other but the covalent
bonds within the molecules holds the solid together.

11. THANKS FOR VIEWING

12. Sources
http://www.jtbaker.com/msds/englishhtml/P5282.htm
http://en.wikipedia.org/wiki/Polyvinyl_alcohol
http://www.druginfo.co.kr/drugimg/30059.gif
http://www.lddiscounts.co.uk/images/products/PVA-980ml.jpg
http://www.solufilm.com/images/solufilm/high50.jpg
http://en.wikipedia.org/wiki/File:Lilit.jpg
http://en.wikipedia.org/wiki/File:Contactlenzen_Confortissimo.JPG
http://www.netdoctor.co.uk/eyes/medicines/100001515.html
http://www.adhesivesmag.com/Articles/Feature_Article/BNP_GUID_9-5-2006_A_10000000000000112679
http://www.articlesbase.com/online-business-articles/plastic-moulded-bodieshard-candies-in-innovative-plastic-moulds-1758253.html
http://en.wikipedia.org/wiki/Polyethylene_terephthalate
http://www.practicalchemistry.org/experiments/pva-polymer-slime,153,EX.html