Responsive P(NIPAM-co-NtBAM) microgels: Flory–Rehner description of the swelling behaviour

Hertle, Yvonne; Zeiser, Michael; Hasenöhrl, Christoph; Busch, Peter; Hellweg, Thomas

doi:10.1007/s00396-010-2232-8

Cited by 63 publications

(78 citation statements)

References 60 publications

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“…The random PNIPAAm-co-PNTBA was synthesized by freeradical polymerization. 20 NIPAAm (20 mmol), NTBA (2.22 mmol), and AIBN (0.24 mmol) were weighed and placed in a reaction flask. Toluene (10 mL) was added to the reaction flask.…”

Section: Synthesis Of Random Pnipaam-co-pntbamentioning

confidence: 99%

“…18 On the other hand, controlled living radical polymerization can improve the previous limitations. 17 The swelling behavior of PNIPAAm-co-poly(N-tert-butyl acrylamide) (PNTBA) random copolymers by radical polymerization was studied with particle diameters in the range 200-315 nm and LCSTs in the range 24-328C for various molar ratios of NIPAAm to NTBA, 20 but the PDI values were not reported. In addition, the nitroxide-mediated copolymerization of NIPAAm and NTBA with N-tert-butyl-N-[1-diethylphosphono(2,2dimethyl propyl)] nitroxide (SG1)/2,2 0 -azobisisobutyronitrile (AIBN) was reported, and the PDIs of the synthesized poly(-PNIPAAm-co-PNTBA)-SG1 were within 1.2-1.3.…”

Section: Introductionmentioning

confidence: 99%

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Thermosensitive copolymer synthesized by controlled living radical polymerization: Phase behavior of diblock copolymers of poly(N‐isopropyl acrylamide) families

Rwei

Chuang

Way

et al. 2015

J of Applied Polymer Sci

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In this study, we prepared a series of thermosensitive polymers with low polydispersity index (PDI) values by nitroxidemediated controlled radical polymerization (NMRP) with 2,2,6,6-tetramethyl-1-piperdinyloxy nitroxide (TEMPO) as a stable nitroxide-free radical. Poly(N-isopropyl acrylamide) (PNIPAAm)-block-poly(N-tert-butyl acrylamide) (PNTBA) was successfully synthesized, first, through polymerization with N-isopropyl acrylamide to obtain the reactive polymer PNIPAAm-TEMPO and, second, through polymerization by the addition of N-tert-butyl acrylamide (NTBA). The added molar fraction of NTBA during the second polymerization was adjusted accordingly to obtain the final polymerization product, a thermosensitive polymer (PNIPAAm-block-PNTBA), which had a targeted lower critical solution temperature (LCST). The result shows that the synthesis method used in this study effectively controlled the formation of the polymer to obtain a low PDI. The thermosensitive block copolymer, PNIPAAm-b-PNTBA (molar ratio 5 9:1), with LCSTs in the range 27.7-39.88C, was obtained through controlled living radical polymerization with PNIPAAm-TEMPO. Specifically, the 5 wt % aqueous solution of PNIPAAm-b-PNTBA (molar ratio 5 9:1) had an LCST of 37.48C; this was close to body temperature, 378C. The 5 wt % aqueous solution of PNIPAAm-b-PNTBA (molar ratio 5 9:1) showed potential for use in biomedical applications.

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Section: Synthesis Of Random Pnipaam-co-pntbamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermosensitive copolymer synthesized by controlled living radical polymerization: Phase behavior of diblock copolymers of poly(N‐isopropyl acrylamide) families

Rwei

Chuang

Way

et al. 2015

J of Applied Polymer Sci

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“…At a temperature below the LCST, a large expansion of the network leads to high absorption (presence of hydrophilic groups-CONH). At a temperature above the LCST increased system entropy occurs [29][30]. Swelling decreases due to hydrophobic interactions of hydrophobic groups of the hydrogels that are dominant.…”

Section: Study Of the Swellingmentioning

confidence: 99%

Synthesis, rheological behavior and swelling properties of copolymer hydrogels based on poly(N-isopropylacrylamide) with hydrophilic monomers

Seddiki¹,

Aliouche²

2013

Bull. Chem. Soc. Eth.

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ABSTRACT. In this study, hydrogels of poly(N-isopropylacrylamide-co-acrylamide) and poly(Nisopropylacrylamide-co-acrylic acid) having a thermoresponsive character were prepared by aqueous free-radical co-polymerization using the ammonium persulfate/N,N,N', N'-tetramethylethylenediamine (APS/TEMED) redoxpair initiator system in the presence of N,N'-methylenebisacrylamide (MBAAm) crosslinker. (NIPAAm-co-AAm) and (NIPAAm-co-AAc) hydrogels with different thermoresponsive properties were obtained by fixing the initial NIPAAm/AAm mole ratio and and (NIPAAm-co-AAc) mole ratio to 80/20 and changing the crosslinker concentration. The copolymers were characterized with infrared spectroscopy (IR) and differential scanning calorimetry (DSC) techniques. The swelling response of the copolymers networks as a function of time, temperature and swelling environment has been observed to be dependent on both structural aspects of the polymers and swelling environment. The swelling has been observed to be decrease with increase in MBAAm in the copolypolymers networks. Rheological behavior was studies in oscillatory module. All copolymers have a viscoelastic behaviour. We note that the elastic modulus G' increases with increasing hydrophilic monomers.

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“…NTBA has been used to adjust the transition temperature in the vicinity of room temperature, enhanced by hydrophilic MAAm. NTBA is a hydrophobic monomer which decreases the volume-phase transition of copolymeric PNIPAM and increases the mechanical properties of the hydrogel [16,17]. The relative concentrations of NTBA and MAAm monomers can provide better hydrophilic-hydrophobic balance within the polymer matrix and hence provide better control over the swelling properties of the gel.…”

Section: Introductionmentioning

confidence: 98%

Swelling, thermal and mechanical properties of NIPAM-based terpolymeric hydrogel

Shekhar¹,

Mukherjee

Sen

2015

Polym. Bull.

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Thermoresponsive hydrogels based on N-isopropylacrylamide, N-tertiary butylacrylamide (NTBA) and methacrylamide (MAAm) have been prepared by free radical copolymerization in water-dioxane mixture. Fourier transform infrared spectroscopy confirmed the presence of all monomers in the hydrogel system. Scanning electron microscopy revealed that the hydrogel having higher amount of NTBA had more smooth structure compared to others. Differential scanning calorimetry results showed that the free and interfacial water decreased but bound water increased with NTBA content in the hydrogel. Dynamic mechanical analysis results revealed increased storage modulus for the hydrogel having higher content of N-tertiarybutylacrylamide. Swelling studies of the hydrogels at different temperatures showed that all samples followed Fickian type of diffusion. The diffusion coefficient increases with increase in MAAm proportion in the hydrogel. The hydrogels were used in concentrating aqueous bovine serum albumin solution. The separation efficiency of hydrogels having higher content of MAAm were found up to 80 % at 5°C but it decreased upon raising the temperature up to 30°C.

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Responsive P(NIPAM-co-NtBAM) microgels: Flory–Rehner description of the swelling behaviour

Cited by 63 publications

References 60 publications

Thermosensitive copolymer synthesized by controlled living radical polymerization: Phase behavior of diblock copolymers of poly(N‐isopropyl acrylamide) families

Thermosensitive copolymer synthesized by controlled living radical polymerization: Phase behavior of diblock copolymers of poly(N‐isopropyl acrylamide) families

Synthesis, rheological behavior and swelling properties of copolymer hydrogels based on poly(N-isopropylacrylamide) with hydrophilic monomers

Swelling, thermal and mechanical properties of NIPAM-based terpolymeric hydrogel

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