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Pva

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  • 1. POLYVINYL ALCOHOL (POLYETHENOL) By Manjot, Dilpreet and Benjamin IUPAC name: poly(l-hydroxyethylene) (C 2 H 4 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.
    Hydrolysis Methyl 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