Recent activity in Polymer Technology

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 ...

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...

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

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...

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...

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

​​​​Which of the following is the most suitable flexible packaging laminate for dry fruits?$\textsf{PET/LDPE}$$\textsf{PS/LDPE}$$\textsf{BOPP/LDPE}$$\textsf{Nylon/LDPE}$

A rubber contains $70 \mathrm{wt} \%$ butadiene (molar mass $=54 \mathrm{~g} / \mathrm{mol})$, $20 \: \mathrm{wt} \%$ isoprene (molar mass $=68 \mathrm{~g} / \mathrm{mol}...

The heat of polymerization of ethylene is $25 \mathrm{kcal} / \mathrm{mol}$. The amount of heat generated during the polymerization of $5.6$ $\textsf{kg}$ polyethylene is...

​​​In a set of copolymerization reactions, the following monomer reactivity ratios ($\textbf{r 1}$ and $\textbf{r 2}$) were found for different cases.$$\begin{array}{|c|c...

​​​​​Which option(s) correctly match(es) the $\textbf{Class of additives}$ used during polymer compounding with the corresponding $\textbf{Chemicals}$?$$\begin{array}{|l|...

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

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...

​​​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 an ideal rubber, the primary factor responsible for elasticity up to small strains isChange in both enthalpy and entropyChange in enthalpy, but no change in the entrop...

Which one of the following solvent environments will likely result in swelling of solid polystyrene? $0.1 \mathrm{M} \mathrm{NaOH}$ in $\mathrm{H}_{2} \mathrm{O}$$\mathr...

\begin{tabular}{|c|c|c|c|c|}\hline \multirow[t]{6}{*}{ Q. 116} & \multicolumn{4}{|c|}{\begin{tabular}{l}Among the options given, identify the correct match between the po...

\begin{tabular}{l|l|}Q. 118 & Choose the correct option that best correlates the graphs with the polymerization \\methods. \\\hline& $\mathrm{P}$ - living polymerization;...

\begin{tabular}{l|l}Q.120 & Among the options given, which agents are used to vulcanize or cure rubbers? \\\hline& Dicumyl peroxide \\\hline& Zinc stearate \\\hline& Carb...

\begin{tabular}{l|l}Q. 122 & \begin{tabular}{l}Among the options given, identify the correct pair(s) of catalyst and co-catalyst \\that form a Ziegler-Natta catalyst.\end...

\begin{tabular}{|c|c|}\hline Q. 124 & \begin{tabular}{l}Stress versus elongation profiles for different polymeric materials are shown in the \\figure. Choose the combinat...

The propagation step of a free radical copolymerization is represented by the following possible reaction steps:$\text{P1}$: $M_{1}^{*}+M_{1} \rightarrow M_{1}^{*}, \quad...

Match the following additives to their respective functions for poly$\text{(vinyl chloride)}$ compounding.AdditiveFunctionP. Dibutyltin maleate1. LubricantQ. Epoxydized s...

Biaxially oriented poly$\text{(propylene)}$ exhibits high clarity because layering of the crystalline structuresdecreases the variation in refractive index across the fil...