List of top Textile Engineering and Fibre Science Questions on Polymerization methods asked in GATE TF

Poly(ethylene terephthalate) has a number average molecular weight of 25000. The degree of polymerisation (rounded off to the nearest integer) is ____

Three melt-spun fibre samples A, B and C produced from same polymer under different conditions are found to have densities 1.10 g/cm3, 1.15 g/cm3 and 1.20 g/cm3, respectively. If the mass fraction based degree of crystallinity (xc) of A and C is 0.45 and 0.75, respectively, then xc for B (rounded off to 2 decimal places) is___

Amongst the following fibre forming polymers, the one which is synthesised by chain growth polymerisation is

Let \( y' \) and \( y'' \) denote the first and second derivatives of \( y \). Let \( y(x) \) satisfy:
\[ y'' - 3y' + 2y = 0,\quad y(0)=1,\quad y'(0)=3. \]
Then \(y''(0)\) (in integer) is ____________.

Molecular weight (g/mol) of polypropylene with a degree of polymerisation of 1000 (rounded off to nearest integer) is ________________.

Polydispersity index of a polymer is 5 and its weight average molecular weight is 8400 g/mol. The number average molecular weight (g/mol) of the polymer (in integer) is ________________.