Polyester presentation.pdf
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This document discusses the structure, manufacturing process, properties, and applications of polyester. Polyester is made from polymers derived from coal, air, water, and petroleum through a chemical reaction between an acid and alcohol. It is manufactured by polymerizing dimethyl terephthalate with ethylene glycol at 150-210°C, then melting, spinning, drawing, and winding the fibers. Polyester has properties including strength, stiffness, hydrophobicity, and resistance to acids, alkalis, bleaching, and sunlight. Its applications include clothing, home furnishings, tires, conveyor belts, safety belts, and cushioning gloves.
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2) An unsaturated polyester resin was synthesized from the glycolysis products and maleic anhydride via polycondensation.
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International Journal of Engineering Research and Applications (IJERA) aims to cover the latest outstanding developments in the field of all Engineering Technologies & science.
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Polymer is a large molecule made of repeating structural units called monomers. The process of linking monomers together to form polymers is called polymerization. There are several ways to classify polymers, including by their origin (natural, synthetic, semisynthetic), structure (linear, branched, cross-linked), and mode of polymerization (addition, condensation). Common polymers include polyethylene, nylon, polyester, bakelite, and natural rubber.
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Katsuki Sharpless Asymmetric Epoxidation and its Synthetic Applications
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2. Low-density polyethylene (LDPE) is produced via free radical polymerization of ethylene under high pressures of 1000-3000 atm and temperatures of 200-275°C. It is used for products like bottles and tubing due to its low cost, chemical resistance, and flexibility.
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Bech2007
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here in details. The research progress of friction and wear resistance properties as a tribological charaterstics
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Polymer is a large molecule made of repeating structural units called monomers. The process of linking monomers together to form polymers is called polymerization. There are several ways to classify polymers, including by their origin (natural, synthetic, semisynthetic), structure (linear, branched, cross-linked), and mode of polymerization (addition, condensation). Common polymers include polyethylene, nylon, polyester, bakelite, and natural rubber.
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2) Scanning electron microscopy showed the nanoparticles were homogeneously dispersed in the polymer matrix.
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Polyester presentation.pdf
- 1. 1
- 2. AbuBakar (20-NTU-TE-0171) M Masood (20-NTU-TE-0156) Dr. Hafiz Shahbaz 2
- 3. Introduction Long-chain polymers (ester, dihydric alcohol, terephthalic acid) Derived from coal, air, water, and petroleum Chemical reaction between an acid and alcohol. Stable and Strong 3
- 4. Structure of Polyester Two main components at 473k 1. Terephthalic acid 2. Ethylene glycol Polyester a strong and stiff material (pi electrons) For pure polyester, the tensile strength at rupture is 27 MPa with a Young's modulus of 920 MPa PET and PBT 4
- 5. Manufacturing of polyester POLYMERIZATION dimethyl terephthalate is first reacted with ethylene glycol in the presence of a catalyst at a temperature 150-210°C. a monomer (single, non-repeating molecule) alcohol, is combined with terephthalic acid and raised to a temperature of 280°C. DRYING Molten ribbon is cooled and extend to fiber MELT SPINNING DRAWING WINDING 5
- 6. PROPERTIES OF POLYESTER Tenacity of polyester fiber Elastic plastic nature Hydrophobic nature Thermal properties Effect of acids Effect Of Alkalis Effect of bleaching 6
- 7. Effect of sunlight Color fastness Microorganisms and bacteria 7
- 8. Applications Clothing Home furnishing Tyres Conveyer belts Safety belts Cushioning and insulating gloves 8
- 9. 9