Polymers

It is correct. Alumina trihydrate and octabromobiphenyl oxide are used as flame retardants for polymers.

Since, toluene is completely compatible with polystyrene.
Tg = V₁Tg₁ + V₂Tg₂
where, Tg₁, Tg₂ = Glass transition temperature of polystyrene and toluene respectively.
V₁, V₂ = Volume fraction of polystyrene and toluene respectively.
Tg1 = 100° C
Assuming Tg₂ = Melting point of toluene = -50° C
Tg = 0.70 (100) + 0.30 (-50) = 70 - 15 = 55° C

Bulky side groups that are stiff and close to the backbone cause steric hindrance, decrease chain mobility and hence,  raise glass transition temperature (Tg).Polypropylene (Tg = –10 °C) < Poly(m-methylstyrene) (Tg = 72 °C) < Polystyrene (Tg = 100 °C) < Poly(o-methylstyrene) (Tg = 119 °C) < Poly(α-methylstyrene) (Tg = 192 °C).
Hence, the correct answer is 1 < 5 < 2 < 4 < 3.

Polycaprolactam is formed by hydrolytic and anionic ring opening polymerisation of caprolactam.

Butadiene and styrene form a completely compatible random copolymer.
Therefore, the following relation is applicable:
Tg = V₁Tg₁ + V₂Tg₂.
Assume 1= polybutadiene
2 = polystyrene
Tg₁ = -80° C; Tg₂ = 100° C
Tg = 0.80 (-80) + 0.20 (100) = - 64 + 20 = - 44° C

Yes, it is correct.
Polycarbonate has a glass transition temperature of about 147° C.
Polysulphone describes a family of thermoplastic polymers. Its glass transition temperature is 185° C.
Polydimethylsiloxane (PDMS) is a crystalline polymer with a glass transition temperature near -125° C.
Polystyrene has a glass transition temperature of about 100° C.

All are correctly matched.
2-hydroxybenzophenone is used as UV stabiliser for polymers.
2-mercaptobenzothiazole is used as accelerator in vulcanisation.
Quinophthalone (greenish yellow) is used as colourant in vinyls and polyolefins.
Dibromoneopentyl glycol (DBNPG) is a brominated flame retardant commonly used as additives during the manufacture of plastic polymers.

Poly vinyl alcohol (PVA) is a vinyl resin.

Yes, it is correct.
Nylon 6,10 is commercial name of poly(hexamethylene sebacamide).
Nomex is commercial name of poly(m-phenyleneisophthalamide).
Kevlar is commercial name of poly(p-phenyleneterephthalamide).

The presence of strong intermolecular bonds in a polymer chain, i.e., a high value of cohesive energy density, will significantly increase Tg. Intermolecular forces increases on going from the intermolecular forces in poly(methyl acrylate), an ester, through the strong hydrogen bonds in poly(acrylic acid) to primary ionic bonds in poly(zinc acrylate). Hence, Tg also increases in the order- polymethylacrylate (Tg = 3 °C) < poly(acrylic acid) (Tg = 106 °C) < poly(zinc acrylate) (Tg >400 °C).

The presence of strong intermolecular bonds in a polymer chain, i.e., a high value of cohesive energy density, will significantly increase Tg. The steric effects of the pendant groups in given compounds (with side chains CH₃, –Cl, and –CN) are similar, but the polarity increases. Consequently, Tg is increased in the order polypropylene ( Tg = –10 °C) < poly(vinyl chloride) (Tg = 87 °C) < polyacrylonitrile (Tg = 103 °C).

Yes. Nylon, Orlon and Teflon are all synthetic polymers.

The densities of the interunit linkages in polycaprolactone (ester units) and polycaprolactam (amide units) are the same. However, the amide units are more polar than the ester units. Consequently, polycaprolactam (226° C) has a much higher Tm than polycaprolactone (61° C).

Nylon 2–nylon 6 is an alternating polyamide copolymer of glycine and amino caproic acid and is biodegradable.
Glyptal is the condensation polymer of ethylene glycol and phthalic acid.

Chain growth polymerisation - In this type of polymerisation, the molecules of the same monomer or different monomers add together on a large scale to form a polymer. The monomers used are unsaturated compounds, e.g. alkenes, alkadienes and their derivatives. Examples are- LDPE, HDPE, Teflon, PAN, etc.

Yes, it is correct.
Tetrabromophthalic anhydride is a reactive flame retardant incorporated into unsaturated resins.
Isoindoline is used as colorant in PVC and polypropylene and some engineering plastics.
2-hydroxybenzotriazole is used as UV stabiliser for polymers.
Dioctylphthalate is used as PVC Plasticiser.

Both are correct.
Tricresyl phosphate and dipropyleneglycol benzoate are used as PVC plasticisers.

Hot SBR is better suited to adhesive formulation than cold SBR. Hot SBR has a lower molecular weight and a broader molecular weight distribution than cold SBR. The lower molecular weight fraction provides quick stick, while the higher molecular weight fraction provides shear strength. On the other hand, narrow molecular weight distribution and higher trans structure of cold SBR make it less adaptable to adhesives.

Tire treads made from solution SBR are superior to those from emulsion SBR. Solution SBR has a higher molecular weight, narrower molecular weight distribution, and higher cis -1,4-polybutadiene content than emulsion SBR. These qualities reduce tread wear and enhance crack resistance of the tire.

Styrene–butadiene block copolymer belongs to the A-B-A type thermoplastic elastomer.
The formation of cellulose ethers, unlike that of cellulose esters, is not reversible. Cellulose ethers are therefore less sensitive to hydrolysis than cellulose esters.

Yes, it is the correct answer.
Poisson ratio of polypropylene is 0.32.
Poisson ratio of polycarbonate is 0.37.
Poisson ratio of polytetrafluoroethylene is 0.45.