Cross linked polymers are (A) Thermoplastic (B) Thermosetting (C) Either (A) or (B) (D) Fibres only

Cross linked polymers are
(A) Thermoplastic
(B) Thermosetting
(C) Either (A) or (B)
(D) Fibres only
by

1 Answer

Answer :

(B) Thermosetting
by

Related questions

Pick out the wrong statement. (A) Linear polymers are formed from bifunctional groups only and are normally thermoplastic (B) Cross-linked branched chain polymers are either elastometric or thermosetting (C) Branching in case of cross-linked polymers caused by small amount of impurities in bifunctional monomer formulation reduces its solubility and increases the softening point (D) Dibasic acids reacts with dihydric alcohols to give polyesters using addition polymerisation reaction

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Last Answer : D) Dibasic acids reacts with dihydric alcohols to give polyesters using addition polymerisation reaction

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Description : Cross linked polymers formed from bi-and trifunctional groups in which cross-linkage in three dimensions via few chemical bonding across linear chains occur imparts to the polymer __________ properties. (A) Thermoplastic (B) Thermosetting (C) Elastometric (D) Brittleness

Last Answer : (C) Elastometric

While the thermosetting polymers are amorphous in nature, the thermoplastic polymers are either amorphous or crystalline. The crystalline polymers are characterised by the (A) Low impact strength (B) High flexibility (C) Better finish and surface appearance (D) High plastic deformation

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Last Answer : A) Low impact strength

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Linear polymers are normally (A) Thermosetting (B) Thermoplastic (C) Elastometric (D) Having extremely high softening poin

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Last Answer : (B) Thermoplastic

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Last Answer : (B) Have three dimensional structure

. Polymers which soften on heating and harden when cooled are (a) Cross-linked polymers (b) Copolymers (c) Thermosetting polymers (d) Thermoplastics

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Last Answer : (D) Less brittle than thermosetting resins

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Last Answer : (A) Do not increase in plasticity with rise in temperature

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Description : List any four properties of thermosetting polymers.

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Identify the group in which all the polymers mentioned can be used to make fibres. (A) Butadiene copolymers, Polyamides, Urea-formaldehyde (B) Cellulose derivatives, Polyisoprene, Polyethylene (C) Cellulose derivatives, Polyamides, Polyurethane (D) Polypropylene, Poly vinyl chloride, Silicon

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Last Answer : (B) Cellulose derivatives, Polyisoprene, Polyethylene

In case of dry spinning of polymers, the polymer solution in a volatile solvent is forced through the spinnerates into a warm air chamber, where the solvent evaporates leaving behind the polymer in the filament form. Dry spinning is used for __________ fibres. (A) Polythene (B) PVC (C) Rayon (D) Polyvinyl acetate

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Last Answer : (B) PVC

Polyvinyl chloride (PVC) (A) Is produced by Polycondensation reaction (B) Uses either emulsion or suspension polymerisation methods (C) Can be made thermosetting by adding a plasticiser (D) Softening temperature is 200°C

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Last Answer : (B) Uses either emulsion or suspension polymerisation methods

Pick out the wrong statement regarding the solubility characteristics of high polymers. (A) Greater the degree of cross-linking in the polymer, lesser is its solubility (B) Polymers having more aliphatic character are more soluble in aliphatic solvents, while those polymers having more aromatic character are more soluble in aromatic solvents (C) Swelling tendency or solubility of polymers in a particular solvent decreases with increase in molecular weight of the solvent (D) High molecular weight polymers on dissolving gives solution of very low viscosity

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Last Answer : (D) High molecular weight polymers on dissolving gives solution of very low viscosity

In step growth polymerisation, generally only one type of reaction & some basic mechanism is involved. Step growth polymerisation reaction is not involved in the manufacture of (A) Cross linked polystyrene (B) Phenol formaldehyde resins (C) Polyesters (D) Polyamides

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Last Answer : (A) High density

Neoprene is rendered non-inflammable, because of (A) Its cross-linked structure (B) Its linear chain structure (C) The presence of chlorine atoms in its monomer (D) The absence of chlorine atoms in its monomer

Description : Neoprene is rendered non-inflammable, because of (A) Its cross-linked structure (B) Its linear chain structure (C) The presence of chlorine atoms in its monomer (D) The absence of chlorine atoms in its monomer

Last Answer : (C) The presence of chlorine atoms in its monomer

In a cross linked polymer, the monomeric units are linked together to constitute a three dimensional network. Which of the following is a cross￾linked polymer? (A) Bakelite (phenol formaldehyde) (B) Polyester (C) Polythene (D) Nylon-6

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Last Answer : (A) Bakelite (phenol formaldehyde)

Bending stress will be least at the extreme fibres for (a) Maximum area of cross section (b) Maximum moment of inertia (c) Maximum section modulus (d) None

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Find the false statement: (A) The relationship construct known as the weak relationship type was defined by Dey, Storey & Barron (1999). (B) A weak relationship occurs when two relationship types are linked by either Event-Precedent sequence or Condition-Precedent sequence (C) Conceptual model is not accurate representation of "Universe of interest". (D) Ternary, Quaternary and Quintary relationships are shown through a series of application scenario's and vignette's

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Last Answer : (C) Conceptual model is not accurate representation of "Universe of interest".

Thermoplastic materials (A) Do not soften on application of heat (B) Are heavily branched molecules (C) Are solvent insoluble (D) None of these

Description : Thermoplastic materials (A) Do not soften on application of heat (B) Are heavily branched molecules (C) Are solvent insoluble (D) None of these

Last Answer : (D) None of these

Silicone is a/an (A) Monomer (B) Inorganic polymer (C) Thermoplastic material (D) A natural polymer

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Last Answer : (B) Inorganic polymer

Pick out the wrong statement. (A) Polystyrene is a thermoplastic polymer (B) Protein is a natural polymer (C) Neoprene is a natural rubber (D) Polythene is a copolymer, while SBR is a homopolymer

Description : Pick out the wrong statement. (A) Polystyrene is a thermoplastic polymer (B) Protein is a natural polymer (C) Neoprene is a natural rubber (D) Polythene is a copolymer, while SBR is a homopolymer

Last Answer : (C) Neoprene is a natural rubber

Polystyrene is a light, transparent, thermoplastic material used for making (A) Toys and combs (B) Packaging bags (C) Non-sticking utensils (D) Electrical insulation

Description : Polystyrene is a light, transparent, thermoplastic material used for making (A) Toys and combs (B) Packaging bags (C) Non-sticking utensils (D) Electrical insulation

Last Answer : (A) Toys and combs

Bakelite is a/an (A) Addition polymer (B) Elastomer (C) Thermoplastic (D) None of these

Description : Bakelite is a/an (A) Addition polymer (B) Elastomer (C) Thermoplastic (D) None of these

Last Answer : (D) None of these

__________ polymer is used for making unbreakable crockery. (A) Thermoplastic (B) Melamine (C) Addition (D) None of these

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Last Answer : (B) Melamine

Which of the following is not a thermoplastic material? (A) Epoxy polymer (B) PVC (C) Polystyrene (D) Polythene

Description : Which of the following is not a thermoplastic material? (A) Epoxy polymer (B) PVC (C) Polystyrene (D) Polythene

Last Answer : (A) Epoxy polymer

Vessels made of __________ can be used to store dry chlorine. (A) Thermoplastic materials (B) Nickel (C) Steel or iron (D) None of these

Description : Vessels made of __________ can be used to store dry chlorine. (A) Thermoplastic materials (B) Nickel (C) Steel or iron (D) None of these

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__________ moulding process cannot be used for thermoplastic plastics. (A) Compression (B) Extrusion (C) Injection (D) None of these

Description : __________ moulding process cannot be used for thermoplastic plastics. (A) Compression (B) Extrusion (C) Injection (D) None of these

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