Recent questions tagged gatexe-2024

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

A certain polymer synthesized in the laboratory shows that all the chains have same number of repeat units $\text{(i.e., same degree of polymerization)}$. The relationshi...

A suitable physical compatibilizer of a binary blend of poly(ethylene) and poly$\text{(propylene)}$ is __________.poly$\text{(caprolactam)}$poly$\text{(lactic acid)}$poly...

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

The 'die swell' phenomenon exhibited by a polymer melt is due toviscous deformationplastic deformationviscous and elastic deformationelastic recovery

Feedstock recycling of poly$\text{(ethylene terephthalate)}$ is carried out byhydrogenationdehydrogenationhydrolysisozonation

Thermoforming operation of semi-crystalline polymers with glass transition temperature, $T_{g}$, and melting temperature, $T_{m}$, is carried out at a temperature $T$, in...

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

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...

Match the following properties with their respective units.PropertyUnitP. Notched Izod impact strength$1 . \mathrm{Pa} \mathrm{s}$Q. Flexural strength$2 . \mathrm{J} \mat...

Melt flow index $\text{(MFI)}$ of a polymer depends on its molecular weight $(M W)$ and melt viscosity $(\eta)$. Select the correct relation(s) from the following.$\text{...

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

If a given poly(ethylene) sample with specific volume, $v=1.042 \times 10^{-3} \mathrm{~m}^{3} \mathrm{~kg}^{-1}$ shows:specific volume of the crystalline fraction, $v_{c...

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...

The glass transition temperature $\text{( $T_{g}$ )}$ of poly$\text{(2,6-dimethyl-p-phenylene oxide) (PPO)}$ is $206.8^{\circ} \mathrm{C}$ and the $T_{g}$ of poly(styrene...

A monodisperse polymer sample of molecular weight $10,000 \mathrm{~g} \mathrm{~mol}^{-1}$ is mixed with another monodisperse sample of the same polymer of molecular weigh...

For a polymer solution, the dependence of viscosity $(\eta)$ on shear rate $(\dot{\gamma})$ is described by the three-parameter Carreau model given by\[\eta=\eta_{0}\left...

The dilute solution viscometry data for two samples of a polymer with two different molecular weights are shown in the figure, where $\eta_{s p} / c$ has been plotted aga...