Recent activity in Synthesis, Manufacturing and Properties

A $75$ $\mathrm{kWh}$ electric vehicle battery pack made of lithium-ion batteries has $4,800$ individual cells in a series-parallel combination, with $120$ cells in serie...

Select the correct option to match the Polymer to its most suitable Monomer(s) from the table given below:PolymerMonomer(s)$\text{P}$Poly($p$-phenylene sulfide)$\text{I}$...

The stress-strain profiles in the figure were obtained following longitudinal tensile loading for a brittle polymer, glass fibre, and a composite lamina consisting of uni...

Which one of the following polymerization methods is used for the synthesis of butyl rubber?Ring opening polymerizationCondensation polymerizationCationic polymerizationA...

Which of these methods is/are used for the synthesis of ceramic powders?Sol-gelHydromechanicalThermomechanicalHydrothermal

A unidirectional composite of a resin is prepared with continuous fibers, wherein the volume fraction of the fiber in the composite is $0.7$. Assume that the resin has a ...

​​​Crystallization is favored in polymer melts when the chain entanglement is $\_\_\_\_\_$ and only polymers with $\_\_\_\_\_$ molecular arrangement can crystallize.maxim...

​​​​Polymer " $\mathbf{Z}$ " has a high melting point and it decomposes even before it melts. Hence, it is usually dissolved and subsequently regenerated. Rayon is one su...

​​​Match the detector for a scanning electron microscope $\textsf{(SEM)}$ in $\textbf{Column I}$ with the resulting output in $\textbf{Column II}$.$\textsf{SE}$: Secondar...

In ball milling of ceramic powder, selection of grinding media depends on the __________ difference between grinding media and powder particles.thermal conductivitydielec...

For chemical vapour deposition $\text{(CVD)}$ process, which of the following statements is/are correct?Target material is stripped off by the bombardment of positive ion...

Consider a unidirectionally aligned continuous glass fibre reinforced epoxy composite with $40$ vol. $\%$ reinforcement. The elastic modulus of the composite along the fi...

A student aims to deposit a thin metallic film on $\mathrm{SiO}_{2}$ substrate, with an adhesion layer between the metal film and substrate, in a contiguous planar fashio...

\begin{tabular}{|l|l|}Q. 112 & Consider the structure of a crosslinked polymer shown in the figure. From the \\options given, identify the monomers that are used in the s...

\begin{tabular}{|c|c|c|}\hline \multirow[t]{2}{*}{ Q. 117} & \multicolumn{2}{|c|}{ What is the correct order of decreasing crystallinity of the given polymers? } \\\hline...

Q. 126 A nylon sample of $0.03 \mathrm{~m}^{2}$ cross-sectional area is subjected to a creep load of $10 \mathrm{kN}$. The load is removed after a duration of $60 \mathrm...

Q. 130 A continuous and aligned glass-fiber reinforced composite consists of $40 \mathrm{vol} \%$ of glass-fiber having a modulus of elasticity of $69 \mathrm{GPa}$ and $...

Phenol-formaldehyde resin is prepared bycondensation polymerizationcationic polymerizationanionic polymerizationring opening polymerization

Nitrile rubber is the copolymer ofstyrene and butadienestyrene and isoprenestyrene and acrylonitrilebutadiene and acrylonitrile

Which of the following polymers is/are synthesized by ring opening polymerization?Poly$\text{(lactic acid)}$Poly$\text{( $\varepsilon$-caprolactone)}$Poly$\text{(styrene)...

A unidirectional composite is prepared using $70 \%$ by volume of epoxy matrix and $30 \%$ by volume of carbon fibre. The elastic modulus of the epoxy matrix is $3.5$ GPa...