Conformational and optical properties of poly(decyl acrylate)

Tsvethov, V.N.; Andreyeva, L.N.; Korneyeva, Ye.V.; Lavrenko, P. N.; Platé, N.A.; Shibayev, V.P.; Petruhhin, B.S.

doi:10.1016/0032-3950(72)90048-2

Cited by 13 publications

(1 citation statement)

References 8 publications

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“…An increase in equilibrium rigidity is facilitated by chain conjugation, such as, for example, in polyisocyanates, and specific non-covalent interactions, such as in DNA and polysaccharides [16][17][18][19][20][21]. In macromolecules with a comb-like structure, increased rigidity is induced by steric obstacles arising between the side chains, which impede the bending and folding of the main chain as a result of intramolecular thermal movement of the units [11,22,23].…”

Section: Introductionmentioning

confidence: 99%

Thermoresponsive Molecular Brushes with a Rigid-Chain Aromatic Polyester Backbone and Poly-2-alkyl-2-oxazoline Side Chains

Тарабукина

Fatullaev

Krasova

et al. 2021

IJMS

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A new polycondensation aromatic rigid-chain polyester macroinitiator was synthesized and used to graft linear poly-2-ethyl-2-oxazoline as well as poly-2-isopropyl-2-oxazoline by cationic polymerization. The prepared copolymers and the macroinitiator were characterized by NMR, GPC, AFM, turbidimetry, static, and dynamic light scattering. The molar masses of the polyester main chain and the grafted copolymers with poly-2-ethyl-2-oxazoline and poly-2-isopropyl-2-oxazoline side chains were 26,500, 208,000, and 67,900, respectively. The molar masses of the side chains of poly-2-ethyl-2-oxazoline and poly-2-isopropyl-2-oxazoline and their grafting densities were 7400 and 3400 and 0.53 and 0.27, respectively. In chloroform, the copolymers conformation can be considered as a cylinder wormlike chain, the diameter of which depends on the side chain length. In water at low temperatures, the macromolecules of the poly-2-ethyl-2-oxazoline copolymer assume a wormlike conformation because their backbones are well shielded by side chains, whereas the copolymer with short side chains and low grafting density strongly aggregates, which was visualized by AFM. The phase separation temperatures of the copolymers were lower than those of linear analogs of the side chains and decreased with the concentration for both samples. The LCST were estimated to be around 45 °C for the poly-2-ethyl-2-oxazoline graft copolymer, and below 20 °C for the poly-2-isopropyl-2-oxazoline graft copolymer.

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