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Polymers(part4)(in Hindi)
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Shankar Kumar
B.TECH | ELECTRONICS & TELECOMMUNICATION | ESE WRITTEN QUALIFIED | 4 YEARS OF TEACHING Experience..

U
Unacademy user
sir, example of polyvinyl chloride is not correct, that is polystyrene...please check it once
Shankar Kumar
a year ago
yess my friend.. I corrected this in the next video..!
ok sir...thank u
sir, if it is possible, please make a video on different types of polymer with their monomers in a single slide
  1. Polymers EMonomers Polymerisation Degree of Polymerisation Different type of polymerisatio n reaction Char, of Polymers Uses Classification of Plastics Thermoplastic Materials Thermosetting Plastic Materials


  2. Hello! Shankar Kumar B.Tech -Electronics&Telecommunication Cleared 2017 ESE written & Two times GATE Qualified. 4 Years of teaching experience


  3. Thermoplastic Materials Polyethylene /PVC/Teflon / Polystyrene


  4. e Tanget 4udi ente o Au fru Branches


  5. 1. Polyethylene It can be 1. High density polyethylene (HDPE) produced at low pressure. 2. Low density polyethylene (LDPE) produced at high pressure. 66 LDPE has low denatfty levels and only a small amount of branching. It is very flexible & easy to clean. It is often used to make plastic film wrap & plastic bags. It can be easily moulded HDPE has higher density levels. It has linear structure with no branching. It is more stronger and resistant to chemicals. It is suitable for blow moulding


  6. The properties of polyethylene include: (i) lighter plastic (ii) does not absorb moisture (iv) relatively low cost (ii) chemically resistant It is used for making : () pipes (ili) packaging (il) fan and blower casing (iv) buckets Ethene Poly(ethene)


  7. 2. Polyvinyl Chloride (PVC) PVC plastic is produced by the addition polymerisation of vinyl chloride. It is different from polyethylene as one of four hydrogen atoms attached to carbon is replaced by a heavier chlorine atom which provides rigidity et The plastic is a self- extinguishing type and widely used for (i) cable jackets (iii) fibre coating (v) flooring & ceiling panelling (ii) lead wire insulation (iv) pipes & fitting


  8. 3. Teflon Teflon is a polytetrafluoroethylene (PTFE) & it is obtained by addition polymerisation technique from tetrafluoroethylene (C F) Polymerisation Tetrafluoroethylene Polytetrafluoroethylene It is used for: (i) bearing bushes (ii) anticorrosion seals (v) chemical pipes (i) piston rings (iv) gaskets for IC - engines


  9. 4. Polystyrene It is obtained from addition polymerisation of monomers styrene,a liquid petrochemical. Polymerisation Styrene Polystyrene The polymer is : () hard & brittle (ii) free from taste & harm to (iv) low dielectric constant food stuff (i) transparent & corrosion resistant It is used for making: (i) food containers (ii) house wares & packaging (i) fan and blower casing (iv) electrical insulation & lenses


  10. Q.2 The reasonfor low rate of plastic recycling are: 1. Scrap plastic has little value because virgin material is rather cheap. 2. Low density of plastic leads to high shipping and handling cost. 3. Recycling leads to a very severe public health hazard. Which of the above reasons are correct? (a) 1, 2 and3 (c) 1 and 3 only (b) (d) 1and 2 only 2and 3 only [ESE: 2017] Ans. (b) 1 and 2 only