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प्रश्न
Write two uses and two properties of polythene.
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उत्तर
Uses of high-density polyethylene:
- HDP is used in the manufacture of toys and other household articles like buckets, dustbins, bottles, pipes, etc.
- It is used to prepare laboratory wares and other objects where high tensile strength and stiffness is required.
Properties of high-density polyethylene:
- HDP is crystalline, melting point in the range of 144 - 150 °C.
- It is much stiffer than LDP and has high tensile strength and hardness.
- It is more resistant to chemicals than LDP.
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संबंधित प्रश्न
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| 1. Teflon | a. CH2 = CH2 |
| 2. PVC | b. CF2 = CF2 |
| 3. Polyester | c. CH2 = CHCl |
| 4. Polythene | d. C6H5OH and HCHO |
| 5. Bakelite | e. Dicarboxylic acid and polyhydoxyglycol |
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\[\ce{n HOOC–R–COOH + n HO–R'–OH}\]
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| (iv) Protein | (d) Amide linkage |
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(a) \[\begin{array}{cc} |
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| (iii) Neoprene | (c) \[\begin{array}{cc} \phantom{................................}\ce{CN}\\ \phantom{..............................}|\\ \ce{-(CH2 - CH = CH - CH2 - CH2 - CH)\underset{n}{-}} \end{array}\] |
| (iv) Novolac | (d) \[\begin{array}{cc} \ce{-(CH2 - CH)\underset{n}{-}}\\ \phantom{.....}|\\ \phantom{.......}\ce{CN} \end{array}\] |
| (v) Buna—N | (e)  |
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