Recent questions in Polymer Science and Engineering

Which one of the following polymer processing techniques involves shaping a heated sheet?ThermoformingInjection moldingBlow moldingExtrusion

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

Match the material property in Column $\text{I}$ with the measurement technique in Column $\text{II}$.${\text{Column I}}$${\text{Column II}}$$\text{P}$Electrical conducti...

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

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...

Norrish-Smith effect or Trommsdorff effect during free radical bulk polymerization at high conversion is characterized by $\_\_\_\_$.increase in rate of polymerization wi...

For a polydisperse polymer, the viscosity-average molecular weight $\left(\bar{M}_{v}\right)$ becomes equal to the weight-average molecular weight $\left(\bar{M}_{w}\righ...

Which one of the following is NOT a rotational rheometer?Cone and plate rheometerParallel plate rheometerCapillary rheometerCylindrical Couette rheometer

Select the correct option to match the Product with the most appropriate Processing technique from the table given below:ProductProcessing technique$\text{P}$Fibre-reinfo...

Which of the following is/are the most appropriate compatibilizer(s) for the ploypropylene/Nylon $66$ blend?Maleic anhydride grafted polystyreneMaleic anhydride grafted p...

An insulating polymer is used as a dielectric medium between two capacitor plates. The dielectric constant of the polymer is $5.0$ and the permittivity of vacuum is $8.85...

Select the correct option to match the Polymer to its Major polymeric constituent from the table given below:PolymerMajor polymeric constituent$\text{P}$Natural rubber$\t...

Resol is produced by reaction of $\_\_\_\_\_\_$.phenol with an excess of formaldehyde in presence of a base catalystformaldehyde with an excess of phenol in presence of a...

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)$\text{I}$...

Select the correct option to match the Compound/Additive to its most suitable Function from the table given below:Compound/AdditiveFunction$\text{P}$Azocarbonamide$\text{...

The variation of steady shear viscosity $(\eta)$ of a polymer melt with shear rate $(\dot{\gamma})$ is shown in the figure, where $\dot{\gamma}_{s}$ is the upper limit of...

Select the correct option to match the Initiator(s) with the Method of polymerization from the table given below:Initiator(s)Method of polymerization$\text{P}$$\mathrm{BF...

Select the correct option to match the Characterization technique with the Information that is obtained using these techniques.Characterization techniqueInformation$\text...

Which of the following options is/are used to plasticize poly(vinyl chloride) (PVC)?Addition of vinyl acetate comonomer during the synthesis of PVCChlorination of PVCAddi...

A certain amount of plasticizer with a glass transition temperature $\left(T_{g}\right)$ of $-50^{\circ} \mathrm{C}$ was added to a polymer to reduce its $T_{g}$ from $70...

Equimolar mixture of terephthalic acid and butylene glycol was taken to synthesize a polyester. The reaction was stopped at $99.6 \%$ conversion of the acid monomer. The ...

A viscoelastic polymer is subjected to a constant strain of $0.3$. The behaviour of the polymer follows Maxwell model of linear viscoelasticity. Elastic modulus of the po...

A single-screw extruder is operated at $12$ $\mathrm{rpm}$ under open discharge condition (i.e., without a die).The screw has a diameter of $10$ $\mathrm{cm}$, a distance...

Match the vitamins in Column I with their respective coenzyme forms listed in Column II.$$\begin{array}{|ll|ll|} \hline & \textbf{Column I} & & \textbf{Column II} \\ \hli...

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...

​​​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...

​​​​Which one of the following measures of viscosity is dimensionless?Inherent viscosityReduced viscosityZero-shear viscositySpecific viscosity

​​​​Which one of the following permits the direct determination of intrinsic viscosity of a polymer solution for known molecular weight of the polymer?Flory-Huggins equat...

​​​Under which combination of conditions does the glass transition of a polymer increase?Increase in molecular weight and increase in plasticizer contentIncrease in plast...

​​​​In a polymer recycling plant, polymer " $\mathbf{X}$ " was depolymerized by glycolysis in the presence of ethylene glycol and a suitable catalyst. The glycolysis reac...

​​​​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 Product with the most appropriate Processing Technique employed.$$\begin{array}{|l|l|l|l|} \hline & \textbf{Product} & & \textbf{Processing Technique} \\ \hli...

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

Match the $\textbf{Polymer}$ with the most suitable $\textbf{Monomer combinations}$ from which it is synthesized.$\begin{array}{|l|l|l|l|} \hline& \textbf{Polymer} && \te...

​​​Thermoplastic Polyurethane and Polyamide $6$ both contain amide linkages, but when compared to Polyurethane, Polyamide $6$ shows higher melting point due to $\_\_\_\_\...

​​​​Injection molding is typically used to make plastic parts. If the pressure at the gate is monitored as a function of time during the injection of a thermoplastic poly...

​​​​The 'unperturbed dimension' of the polymer chain is represented as,$$\left(\overline{r_{o}^{2}}\right)^{1 / 2} \propto \bar{l}(n)^{1 / 2}$$where,$\left(\overline{r_{o...

​​​Choose the option(s) that correctly match(es) the $\textbf{Zones}$ with their typical $\textbf{Functions}$ in an industrial extruder$$\begin{array}{|l|l|l|l|} \hline &...

​​Which option(s) correctly match(es) the $\textbf{Polymer property}$ with its appropriate $\textbf{Units}$?$$\begin{array}{|l|l|l|l|}\hline & \textbf{Polymer property} &...