Dynamo-optical and electro-optical properties of solutions of diphenyl-substituted poly-para-phenylene terephthalate in polar and non-polar solvents

Tsvetkov, V.N.; Andreyeva, L.N.; Филиппов, А. П.; Belyneva, Ye.V.; Bilibin, A. Yu.; Stepanova, A.R.

doi:10.1016/0032-3950(91)90197-x

Cited by 1 publication

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References 6 publications

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“…Such structures are characterized by the so-called "crankshaft" conformation [11], which provides high equilibrium rigidity. For example, the Kuhn segment length of a para-aromatic polyester (pAPE) (Figure 9) is 26 nm according to hydrodynamic data [80] and 20 nm according to flow birefringence data [81]. As seen in Figures 1 and 9, the APEr.ch.…”

Section: Synthesis Of the Polyester Multifunctional Macroinitiatormentioning

confidence: 98%

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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Section: Synthesis Of the Polyester Multifunctional Macroinitiatormentioning

confidence: 98%

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

View full text Add to dashboard Cite

show abstract

Dynamo-optical and electro-optical properties of solutions of diphenyl-substituted poly-para-phenylene terephthalate in polar and non-polar solvents

Cited by 1 publication

References 6 publications

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

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

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