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A polyamide is a polymer that contains recurring amide groups (R−CO−NH−R′) as integral parts of the main polymer chain.
Moreover, the presence of the central B block in the main polymer chain facilitates the process of compostability.
Absorption bands at 2860 and 2930 cm-1 could be attributed to the valence vibrations v(CH) in CH2 and CH groups of the main polymer chain.
The αc- and αa-relaxations are associated with the molecular motions in the crystalline regions and micro-Brownian motion in the amorphous regions of the main polymer chain, respectively, whereas the β-relaxation is attributed to the rotation of side group dipoles or to the local oscillations of the frozen main polymer chain.
13C-NMR (measurement was made at 80 °C) data of the polymeric mass when compared with the literature, were indicative of poly(NBE ROMP-alt-poly(NBE ROMP-alt-poly, aNBE ROMP-alt-polyiNBE VIP the incorporation of poly(NBE)ROMP unitsequencesin polymer chand.
In this study, polyoxadiazole-based coatings were molecularly designed by attaching two different functional groups, i.e., diphenyl-ether and diphenyl-hexafluoropropane, in the main polymer chain for the purpose of low water permeability and eventually for high corrosion protection of AM50 magnesium alloy.
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Because their main polymer chains are saturated, CM and CSM elastomers are highly resistant to oxidation and ozone attack, and their chlorine content gives some flame resistance and resistance to swelling by hydrocarbon oils.
PVA-p-PDAmC2 has a very high photoreactivity compared with p-PDAmC2; this can be ascribed to the formation of ground state pairs of p-PDAmC2 moieties as side chains due to repulsive interaction between the hydrophobic side chains and the hydrophilic main PVA polymer chain.
In this review, based on introducing sources of discarded biomass, the main composition and polymer chains in discarded biomass materials, the traditional treatment and novel approach for reutilization of discarded biomass were summarized.
And these polymers show a tendency of semicrystallinity to amorphous state with the insertion of more rigid phenyl rings in functional sites of polymers' main chain.
Tgs of styrene polymers with CF3 substituted on the ortho position of the phenyl ring were much higher than those of the meta and para substituted styrenes due to the steric hindrance of the bulky CF3 group close to the polymer main chain, which resulted in a decrease in the segment mobility of the polymer chains and an increasing Tg of the polymers.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com