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Pva

  1. 1. POLYVINYL ALCOHOL (POLYETHENOL) By Manjot, Dilpreet and Benjamin IUPAC name: poly(l-hydroxyethylene) (C 2 H 4 O) n
  2. 2. General information <ul><li>Polyethenol also known as Polyvinyl Alcohol is generally known as PVA. It is most commonly used in adhesive products and for making other polymers. </li></ul>Monomer Polymer Polyethenol Polymer O O O O O
  3. 3. Production <ul><li>Unlike many vinyl polymers, Polyvinyl Alcohol </li></ul><ul><li>is not made via polymerization of the </li></ul><ul><li>corresponding monomer. </li></ul>Hydrolysis Methyl Alcohol + Vinyl Alcohol ---------------> Polyvinyl Alcohol
  4. 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. 5. Other Physical Data <ul><li>Relative Molecular Mass: 44g/mol </li></ul><ul><li>Flash Point: 79.44 °c </li></ul><ul><li>Specific Gravity: 1.19-1.31 </li></ul><ul><li>Density: 1.19-1.31 g/cm³ </li></ul><ul><li>Solubility: Soluble In Cold Water, Hot Water </li></ul><ul><li>The material is pretty inert. It is not harmful, does not react very much/easily and can be contained with ease. </li></ul>
  6. 6. Some Uses of PVA <ul><li>Polyvinyl alcohol has excellent film forming, emulsifying, and adhesive properties. </li></ul><ul><li>It is resistant to oil, grease and solvent. </li></ul><ul><li>PVA is fully degradable and is a quick dissolver </li></ul><ul><li>Used in water transfer printing process </li></ul><ul><li>Used in eye drops and hard contact lens solution as a lubricant </li></ul><ul><li>PVA fiber, as reinforcement in concrete </li></ul>
  7. 7. Explanations of Applications <ul><li>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. </li></ul>
  8. 8. Explanations of Applications 2 <ul><li>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. </li></ul>
  9. 9. Explanations of Applications 3 <ul><li>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. </li></ul>
  10. 10. Explanations of Applications 4 <ul><li>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. </li></ul>
  11. 11. THANKS FOR VIEWING
  12. 12. Sources <ul><li>http://www.jtbaker.com/msds/englishhtml/P5282.htm </li></ul><ul><li>http://en.wikipedia.org/wiki/Polyvinyl_alcohol </li></ul><ul><li>http://www.druginfo.co.kr/drugimg/30059.gif </li></ul><ul><li>http://www.lddiscounts.co.uk/images/products/PVA-980ml.jpg </li></ul><ul><li>http://www.solufilm.com/images/solufilm/high50.jpg </li></ul><ul><li>http://en.wikipedia.org/wiki/File:Lilit.jpg </li></ul><ul><li>http://en.wikipedia.org/wiki/File:Contactlenzen_Confortissimo.JPG </li></ul><ul><li>http://www.netdoctor.co.uk/eyes/medicines/100001515.html </li></ul><ul><li>http://www.adhesivesmag.com/Articles/Feature_Article/BNP_GUID_9-5-2006_A_10000000000000112679 </li></ul><ul><li>http://www.articlesbase.com/online-business-articles/plastic-moulded-bodieshard-candies-in-innovative-plastic-moulds-1758253.html </li></ul><ul><li>http://en.wikipedia.org/wiki/Polyethylene_terephthalate </li></ul><ul><li>http://www.practicalchemistry.org/experiments/pva-polymer-slime,153,EX.html </li></ul>
  • ArunKbz

    Jul. 26, 2016

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