Advertisements
Advertisements
प्रश्न
Attempt the following:
What is meant by LDP and HDP? Mention the basic difference between the same with suitable examples.
उत्तर
LDP is a branched polymer of ethene with polymeric chains loosely held. Hence, even though it is tough, it is extremely flexible. Therefore, LDP is used in producing extruded films, sheets, mainly for packaging and household uses like in preparation of squeeze bottles, attractive containers, etc. where low tensile strength and flexibility are required.
On the other hand, HDP is a linear polymer of ethene with closely packed polymeric chains. Hence, it is much stiffer than LDP and has high tensile strength and hardness. Therefore, HDP is used in the manufacture of toys and other household articles like buckets, dustbins, bottles, pipes, laboratory wares, and other objects where high tensile strength and stiffness are required.
APPEARS IN
संबंधित प्रश्न
Explain the following term: Homopolymers
Based on molecular forces, what type of polymer is neoprene?
Write the structure of melamine.
Write the monomers of the following polymer :
Answer the following in one sentence.
Identify 'B' in the following reaction:
\[\ce{H2N -(CH2)6 - NH2 + HOOC - (CH2)4 - COOH ->[N2][533 K]}\]'B'
Answer the following in one sentence.
Define the term: Vulcanization
Answer the following in one sentence.
What type of intermolecular force leads to high-density polymer?
Answer the following in one sentence.
Identify thermoplastic and thermosetting plastic from the following:
- PET
- Urea formaldehyde resin
- Polythene
- Phenol formaldehyde resin
Answer the following.
Write the reaction of the formation of Terylene.
Draw the structures of polymers formed from the following monomers
\[\ce{n HOOC–R–COOH + n HO–R'–OH}\]
Answer the following.
Write name and formula of raw material from which bakelite is made.
Identify condensation polymers and addition polymers from the following.
\[\begin{array}{cc}\ce{-(CH2 - CH -)_{n}}\\
\phantom{....}|\\\ce{\phantom{.......}C6H5}
\end{array}\]
Answer the following.
Write main specialities of Buna-S, Neoprene rubber?
Nylon 6, 6 is a condensation polymer of hexamethylenediamine and _____________
Monomers ethylene glycol and terephthalic acid undergo condensation polymerization to give polymer called ___________
Mention two uses of LDP.
Write chemical reactions for the preparation of high-density polythene.
Write two uses and two properties of polythene.
Which among the following polymers is obtained from styrene and 1-3-butadiene?
Which of the following polymer is used in paints?
Identify additional polymers from the following.
I. \[\begin{array}{cc}
\ce{-(CH2 - CH -)_{{n}}}\\
\phantom{....}|\\
\phantom{.......}\ce{C6H5}
\end{array}\]
II. \[\ce{-(CH2 - CH = CH - CH2 -)_{{n}}}\]
III. \[\ce{-(CO(CH2)4 - CONH(CH2)6NH -)_{{n}}}\]
IV.
The INCORRECT match for the polymer with its application is:
Which of the following is the monomer of neoprene?
Select the CORRECT match for both the polymers.
\[\ce{{n} CH2 = CH2 ->[333 K - 343 K][6 - 7 atm, catalyst] X}\]
Which of the following is CORRECT about polymer 'X'?
Which among the following polymers can NOT be remoulded?
Identify the catalyst used in the manufacture of high density polythene.
Which among the following polymers is an example of addition polymer?
Which of the following polymers is used as insulation for cables?
Which of the following is not a semisynthetic polymer?
The commercial name of polyacrylonitrile is ______.
Which of the following polymers, need atleast one diene monomer for their preparation?
(i) Dacron
(ii) Buna-S
(iii) Neoprene
(iv) Novolac
Match the polymers given in Column I with the type of linkage present in them given in Column II.
| Column I | Column II |
| (i) Terylene | (a) Glycosidic linkage |
| (ii) Nylon | (b) Ester linkage |
| (iii) Cellulose | (c) Phosphodiester linkage |
| (iv) Protein | (d) Amide linkage |
| v) RNA |
Which of the following is not a copolymer?
F2C = CF2 is monomer of the polymer -
Which of the following is an example of polyester?
Which of the following polymers is synthesized using a free radical polymerisation technique?
Nylon threads are made of ______.
Which of the following polymers do not involve cross linkages?
The catalyst used for the polymerisation of olefins is ______.
Answer the following.
Name and draw structure of the repeating unit in natural rubber.
Name and draw the structure of the repeating unit in natural rubber.
How the Bakelite is prepared? Give the steps involved in the preparation.
Name the compound which reacts with formaldehyde to produce ethyl alcohol.
Name and draw structure of the repeating unit in natural rubber.
The monomer used in preparation of teflon is ______.
Write the structure of isoprene and the polymer obtained from it.
Name and draw the structure of the repeating unit in natural rubber.
Write the structure of isoprene and the polymer obtained from it.
Write the structure of isoprene and the polymer obtained from it.
Write the structure of isoprene and the polymer obtained from it.
Name and draw the structure of the repeating unit in natural rubber.
Write the structure of isoprene and the polymer obtained from it.
Write the structure of isoprene and the polymer obtained from it.
