Novel thermoresponsive block copolymers having different architectures—structural, rheological, thermal, and dielectric investigations

Kyriakos, Konstantinos; Aravopoulou, Dionysia; Augsbach, Lukas; Sapper, Josef; Ottinger, Sarah; Psylla, Christina; Rafat, Ali; Benitez-Montoya, Carlos Adrian; Miasnikova, Anna; Di, Zhenyu; Laschewsky, André; Müller‐Buschbaum, Peter; Kyritsis, Apostolos; Papadakis, Christine M.

doi:10.1007/s00396-014-3282-0

Cited by 16 publications

(11 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This makes it possible to conclude that these particles are individual macromolecules of star. Their structure is probably similar to that of unimolecular micelles of “core–shell” type, whose arms are strongly folded. The scattering objects with middle R h‐m and large R h‐s hydrodynamic radii are supramolecular structures, which are often called micelle‐like aggregates and loose aggregates, accordingly.…”

Section: Resultsmentioning

confidence: 99%

Synthesis, Characterization, and Investigation of Thermosensitive Star-Shaped Poly(2-isopropyl-2-oxazolines) Based on Carbosilane Dendrimers

Amirova

Rodchenko

Makhmudova

et al. 2016

Macromol. Chem. Phys.

View full text Add to dashboard Cite

Star‐shaped poly(2‐isopropyl‐2‐oxazolines) with dramatically hydrophobic dendrimer core are synthesized using carbosilane dendrimers of first to third generations as macroinitiators. It is observed that half of the initiator functional groups are incorporated in polymerization process. The polymerization degree of polyoxazoline arms is about 25. Strong arm folding results in small molecule dimensions in both aqueous and organic solutions. Thermosensitive properties are studied for second generation‐based star solution with the concentration of 0.00095 g cm−3. Model linear poly(2‐isopropyl‐2‐oxazolines) are investigated for comparison. Carbosilane dendrimer core interaction leads to the formation of different types of aggregates at low temperatures. The temperatures of the beginning (T1 = 42–43 °C) and finishing (T2 = 50 °C) of phase separation are determined. It is shown that macromolecule compactization and aggregation take place even far from the phase transition interval and alternately prevail on heating.

show abstract

Section: Resultsmentioning

confidence: 99%

Synthesis, Characterization, and Investigation of Thermosensitive Star-Shaped Poly(2-isopropyl-2-oxazolines) Based on Carbosilane Dendrimers

Amirova

Rodchenko

Makhmudova

et al. 2016

Macromol. Chem. Phys.

View full text Add to dashboard Cite

show abstract

“…For example, below their CPTs, PNIPAm copolymers with 2–5 kDa terminal PS blocks have been reported to exhibit CMCs in the range of ~1–30 µg mL −1 , depending on the molecular weights of both PNIPAm and PS blocks [ 45 , 46 , 47 ]. It was further shown, that thermoresponsive poly[(methoxy diethylene glycol) methacrylate] and POEGMA both equipped with terminal PS blocks of ~1–1.5 kDa exhibit CMCs in water at ~430 and ~50–200 µg mL −1 , respectively [ 48 , 49 , 50 ]. Ge et al investigated the aggregation behavior of PNIPAm (~25–35 kDa) equipped with terminal dendritic G 2 (0.7 kDa) and G 3 (1.6 kDa) poly(benzyl ether) (PBE) blocks [ 51 ], which are similar to the herein reported EBP-based anchor blocks in both chemistry and molecular weight ( Table 2 ).…”

Section: Discussionmentioning

confidence: 99%

Thermoresponsive Poly(glycidyl ether) Brush Coatings on Various Tissue Culture Substrates—How Block Copolymer Design and Substrate Material Govern Self-Assembly and Phase Transition

Stöbener

Weinhart

2020

Polymers

View full text Add to dashboard Cite

Thermoresponsive poly(glycidyl ether) brushes can be grafted to applied tissue culture substrates and used for the fabrication of primary human cell sheets. The self-assembly of such brushes is achieved via the directed physical adsorption and subsequent UV immobilization of block copolymers equipped with a short, photo-reactive benzophenone-based anchor block. Depending on the chemistry and hydrophobicity of the benzophenone anchor, we demonstrate that such block copolymers exhibit distinct thermoresponsive properties and aggregation behaviors in water. Independent on the block copolymer composition, we developed a versatile grafting-to process which allows the fabrication of poly(glycidyl ether) brushes on various tissue culture substrates from dilute aqueous-ethanolic solution. The viability of this process crucially depends on the chemistry and hydrophobicity of, both, benzophenone-based anchor block and substrate material. Utilizing these insights, we were able to manufacture thermoresponsive poly(glycidyl ether) brushes on moderately hydrophobic polystyrene and polycarbonate as well as on rather hydrophilic polyethylene terephthalate and tissue culture-treated polystyrene substrates. We further show that the temperature-dependent switchability of the brush coatings is not only dependent on the cloud point temperature of the block copolymers, but also markedly governed by the hydrophobicity of the surface-bound benzophenone anchor and the subjacent substrate material. Our findings demonstrate that the design of amphiphilic thermoresponsive block copolymers is crucial for their phase transition characteristics in solution and on surfaces.

show abstract

“…SAXS/SANS studies have been published on a variety of block copolymers such as the diblock copolymer poly(methoxy diethylene glycol acrylate)-block-polystyrene (PS), 5 the diblock copolymer PS-PNIPAM 6 , deuterated polystyrene and poly(n-hexyl methacrylate) (PnHMA), 7 poly(2-isopropyl-2-oxazoline)-b-poly(2-ethyl-2-oxazoline), 8 C18EO100 9 , polyethylene oxide -poly(2-vinylpyridine) 10 , polyethylene oxide -PNIPAM, 11,12 and PNIPAMpoly(n-butyl acrylate) 13,14 and on triblock copolymers such as (LCP, poly(4-cyanobiphenyl-4-oxyundecylacrylate)) 'A' endblock and a deuterated polystyrene 'B' midblock, 15 PS-PMDEGA-PS, 16,17 and PS-PNIPAM-PS 18 . The most studied class of temperature-responsive polymers are poly(ethylene oxide-block-propylene oxide-blockethylene oxide) PEO-PPO-PEO triblock copolymers known as Pluronics ® .…”

Section: Introductionmentioning

confidence: 99%

Synthesis and solution properties of a temperature-responsive PNIPAM–b-PDMS–b-PNIPAM triblock copolymer

2017

View full text Add to dashboard Cite

In this paper, we report the synthesis and self-assembly of a novel thermoresponsive PNIPAM60-b-PDMS70-b-PNIPAM60 triblock copolymer in aqueous solution. The copolymer used a commercially available precursor modified with an atom-transfer radical polymerisation (ATRP) initiator to produce an ABA triblock copolymer via ATRP. Smallangle neutron scattering (SANS) was used to shed light on the structures of nanoparticles formed in aqueous solutions of this copolymer at two temperatures, 25 and 40 °C. The PDMS

show abstract

Novel thermoresponsive block copolymers having different architectures—structural, rheological, thermal, and dielectric investigations

Cited by 16 publications

References 46 publications

Synthesis, Characterization, and Investigation of Thermosensitive Star-Shaped Poly(2-isopropyl-2-oxazolines) Based on Carbosilane Dendrimers

Synthesis, Characterization, and Investigation of Thermosensitive Star-Shaped Poly(2-isopropyl-2-oxazolines) Based on Carbosilane Dendrimers

Thermoresponsive Poly(glycidyl ether) Brush Coatings on Various Tissue Culture Substrates—How Block Copolymer Design and Substrate Material Govern Self-Assembly and Phase Transition

Synthesis and solution properties of a temperature-responsive PNIPAM–b-PDMS–b-PNIPAM triblock copolymer

Contact Info

Product

Resources

About