Synthesis and swelling behavior of polyurethane networks based on hyperbranched polymer

Džunuzović, Jasna V.; Pergal, Marija V.; Jovanović, Slobodan; Vodnik, Vesna

doi:10.2298/hemind110902071d

Cited by 18 publications

(22 citation statements)

References 17 publications

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“…The peak at 1120 cm −1 stem from OCH 3 vibrations . As for Cur/PU nanocomposites (curve 2), we could detect the same peaks as in curcumin sample shifted with a peak at 3400 cm −1 could be assigned to OH stretching vibrations whereas the peaks at 2940 and 2854 cm −1 belong to sp 2 and sp 3 CH stretching vibrations . The peaks at 1730, 1701, 1614, and 1529 cm −1 are stemming from carbonyl groups.…”

Section: Resultssupporting

confidence: 61%

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Structural, mechanical, and antibacterial features of curcumin/polyurethane nanocomposites

Marković

Kováčová

Mičušík

et al. 2018

J of Applied Polymer Sci

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Various types of bacteria inhabit many surfaces thus causing problems which can have very strong impact on human health. Here we present a study of photophysical, mechanical, and antibacterial properties of curcumin/polyurethane nanocomposites prepared by swell‐encapsulation‐shrink method. The prepared nanocomposites have been characterized for degree of swelling, surface morphology, mechanical properties, chemical contents, photoluminescence, hydrophobicity, potentials for singlet oxygen generation, and antibacterial activity. Dynamic mechanical analysis has shown slight changes of glass temperature of curcumin/polyurethane nanocomposites due to blue light irradiation. It was found that nanocomposites have very strong photoluminescence, become photoactive upon blue light irradiation at 470 nm and generate singlet oxygen. Conducted antibacterial tests have shown very strong activity of these nanocomposites especially toward Escherichia coli. These bacteria strains have been eliminated completely only after 1 h irradiation by blue light. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47283.

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Section: Resultssupporting

confidence: 61%

“…Values of three parallel swelling experiments for each sample are averaged. The swelling degree was calculated by gravimetric method …”

Section: Methodsmentioning

confidence: 99%

Structural, mechanical, and antibacterial features of curcumin/polyurethane nanocomposites

Marković

Kováčová

Mičušík

et al. 2018

J of Applied Polymer Sci

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“…The large number of terminal hydroxyl groups present in Boltorn ® HBPs enables fast formation of networks that have good mechanical properties, as well as good resistance to chemicals [11][12][13][14], while the presence of PDMS contributes to the good thermal and surface properties, and to elasticity of the highly crosslinked materials. In our previous studies, we have investigated the influence of the content of !,"-dihydroxyethoxy propyl-poly(dimethylsiloxane) (EO-PDMS) and type of HBPs on the swelling behavior, morphological, thermal and thermomechanical properties of PU networks [15][16][17][18][19][20][21]. These results confirmed that physical and thermal properties are related to the crosslinking density, hydrogen bonding interactions, microphase separation and content of EO-PDMS soft segment.…”

supporting

confidence: 55%

“…Catalyst concentration was kept at 0.02 wt% [25][26][27]. The details for the synthesis of similar PU networks are given in our previously published papers [16][17][18][19][20][21]. Compositions of the synthesized PUs and weights of the reactants used for the synthesis of PUs are presented in Table 1.…”

Section: Synthesis Of Pu Films Based On Pdmsmentioning

confidence: 99%

Surface and thermomechanical characterization of polyurethane networks based on poly(dimethylsiloxane) and hyperbranched polyester

Pergal

Džunuzović²,

Poręba³

et al. 2013

Express Polym. Lett.

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Two series of polyurethane (PU) networks based on Boltorn® hyperbranched polyester (HBP) and hydroxyethoxy propyl terminated poly(dimethylsiloxane) (EO-PDMS) or hydroxy propyl terminated poly(dimethylsiloxane) (HPPDMS), were synthesized. The effect of the type of soft PDMS segment on the properties of PUs was investigated by Fourier transform infrared spectroscopy (FTIR), contact angle measurements, surface free energy determination, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), atomic force microscopy (AFM), dynamic mechanical thermal analysis (DMTA) and differential scanning calorimetry (DSC). The surface characterization of PUs showed existence of slightly amphiphilic character and it revealed that PUs based on HP-PDMS have lower surface free energy, more hydrophobic surface and better waterproof performances than PUs based on EO-PDMS. PUs based on HPPDMS had higher crosslinking density than PUs based on EO-PDMS. DSC and DMTA results revealed that these newlysynthesized PUs exhibit the glass transition temperatures of the soft and hard segments. DMTA, SEM and AFM results confirmed existence of microphase separated morphology. The results obtained in this work indicate that PU networks based on HBP and PDMS have improved surface and thermomechanical properties

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“…Measured values from three parallel swelling experiments were averaged. Gravimetric method has been used to calculate the swelling degree [39].…”

Section: Characterization Of Hcqds/pdms Nanocompositesmentioning

confidence: 99%

Antibacterial photodynamic activity of carbon quantum dots/polydimethylsiloxane nanocomposites against Staphylococcus aureus, Escherichia coli and Klebsiella pneumoniae

Marković

Kováčová

Humpolíček

et al. 2019

Photodiagnosis and Photodynamic Therapy

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Despite of great researcher's efforts the design of antibacterial surfaces is still a big challenge due to appearance of mutated bacteria strains resistant to antibiotics. In this work, results of structural, mechanical, cytotoxic and antibacterial activities of hydrophobic carbon quantum dots/polydimethylsiloxane surface are presented. Antibacterial action of this surface is based on the generation of reactive oxygen species which cause bacteria damage by oxidative stress. At the same time, this surface is not cytotoxic towards the NIH/3T3 cells. Swellingencapsulation-shrink method is applied for encapsulation of hydrophobic carbon quantum dots in medical grade silicone-polydimethylsiloxane. XPS and photoluminescence spectroscopy analyses confirm that hydrophobic carbon quantum dots have been encapsulated successfully into polydimethylsiloxane polymer matrix. Based on stress-strain test the improvement of mechanical properties of these nanocomposites is established. It is shown by electron paramagnetic resonance spectroscopy and luminescence method that nanocomposite generates singlet oxygen initiated by 470 nm blue light irradiation.Antibacterial testing shows the nanocomposite in the form of foil kills Staphylococcus aureus, Escherichia coli and Klebsiella pneumoniae very effective only after 15 min irradiation.

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Synthesis and swelling behavior of polyurethane networks based on hyperbranched polymer

Cited by 18 publications

References 17 publications

Structural, mechanical, and antibacterial features of curcumin/polyurethane nanocomposites

Structural, mechanical, and antibacterial features of curcumin/polyurethane nanocomposites

Surface and thermomechanical characterization of polyurethane networks based on poly(dimethylsiloxane) and hyperbranched polyester

Antibacterial photodynamic activity of carbon quantum dots/polydimethylsiloxane nanocomposites against Staphylococcus aureus, Escherichia coli and Klebsiella pneumoniae

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