Plasma‐induced, solid‐state polymerization of <i>N</i>‐isopropylacrylamide

Ünver, Alper; Akovali, G.

doi:10.1002/app.31391

Cited by 8 publications

(13 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Synthesis scheme of the p(NIPAAm‐co‐MBA) hydrogels by DBD plasma liquid polymerization using MBA as crosslinking monomer (m = m′ + m″ refers to the NIPAAm units, while n = n′ + n″ refers to the MBA units as adapted from Zhang et al…”

Section: Methodsmentioning

confidence: 99%

“…However, novel possibilities for creating of hydrogel systems based on microwave irradiation, electron beam irradiation, gamma irradiation, UV‐induced polymerization, glow discharge plasma polymerization of volatile monomers in gas phase, solid phase plasma polymerization, and plasma polymerization in liquids have been reported. In these systems, the reaction time required for synthesis of hydrogels can be considerably shortening from several hours to several minutes in comparison with conventional polymerization methods.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis of Thermo-Sensitive Hydrogels from Free Radical Copolymerization of NIPAAm with MBA Initiated by Atmospheric Plasma Treatment

Jovančić

Vílchez

Molina

2015

Plasma Process. Polym.

View full text Add to dashboard Cite

Thermo-sensitive hydrogels from free radical copolymerization of NIPAAm and crosslinking monomer MBA (p(NIPAAm-co-MBA)) using in situ liquid atmospheric DBD plasma are successfully synthesized as revealed by FTIR and solid state 13 C-NMR analysis, despite a rather short polymerization time of 10 min. The addition of MBA crosslinking monomer exerts a positive influence on the p(NIPAAm-co-MBA) copolymerization process, particularly at higher monomer concentrations and incident plasma power as suggested by GPC analysis. The swelling capacity of the p(NIPAAm-co-MBA) hydrogels declines significantly when the MBA concentration increased due to better crosslinking efficiency during the copolymerization process. The decrease in swelling capacity of p(NIPAAm-co-MBA) is also displayed by cryo-SEM analysis as smaller pore sizes and higher pore density of hydrogels were detected. The thermo responsiveness of p(NIPAAm-co-MBA) hydrogels is confirmed by DSC analysis with LCST values similar to the LCTS value of p(NIPAAm) around 32 8C. Enthalpy /J/g : 58,5924 (Endothermic effect) Exo Peak: 32.8140 o C Onset point: 26.5695 o C Enthalpy: 26.4631 J/g Peak: 33.2749 o C Onset point: 30.6265 o C Enthalpy: 69.6224 J/g Peak: 33.5454 o C Onset point: 21.9078 o C Enthalpy: 58.5924 J/g Peak: 33.0978 o C Onset point: 30.6117 o C Enthalpy: 59.0967 J/g Figure 6. DSC thermograms of the p(NIPAAm-co-MBA) hydrogels obtained at 30 W plasma power with (a) 10% NIPAAm with 0.1% MBA, (b) 10% NIPAAm with 1% MBA, (c) 20% NIPAAm with 0.2% MBA, and (d) 20% NIPAAm with 2% MBA (heating rate of 1.5 8C min À1 from 5 to 50 8C).

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis of Thermo-Sensitive Hydrogels from Free Radical Copolymerization of NIPAAm with MBA Initiated by Atmospheric Plasma Treatment

Jovančić

Vílchez

Molina

2015

Plasma Process. Polym.

View full text Add to dashboard Cite

show abstract

“…According to Yasuda [39], both polymerization processes likely took place in the adhesives. However, because of very low evaporation capability of the monomers used (for example, the vapor pressure of HEMA is 0.01 mm Hg at 25 °C), the occurrence of plasma-state polymerization is less possible and could be ignored [40]. Plasma-induced polymerization likely produced nearly all of the plasma-cured adhesive resins.…”

Section: Discussionmentioning

confidence: 99%

Effect of a non-thermal, atmospheric-pressure, plasma brush on conversion of model self-etch adhesive formulations compared to conventional photo-polymerization

et al. 2012

View full text Add to dashboard Cite

Objective To determine the effectiveness and efficiency of non-thermal, atmospheric plasmas for inducing polymerization of model dental self-etch adhesives. Methods The monomer mixtures used were bis-[2-(methacryloyloxy)ethyl] phosphate (2MP) and 2-hydroxyethyl methacrylate (HEMA), with mass ratios of 70/30, 50/50 and 30/70. Water was added to the above formulations: 10–30 wt%. These monomer/water mixtures were treated steadily for 40 s under a non-thermal atmospheric plasma brush working at temperatures from 32° to 35°C. For comparison, photo-initiators were added to the above formulations for photo-polymerization studies, which were light-cured for 40 s. The degree of conversion (DC) of both the plasma- and light-cured samples was measured using FTIR spectroscopy with an attenuated total reflectance attachment. Results The non-thermal plasma brush was effective in inducing polymerization of the model self-etch adhesives. The presence of water did not negatively affect the DC of plasma-cured samples. Indeed, DC values slightly increased, with increasing water content in adhesives: from 58.3% to 68.7% when the water content increased from 10% to 30% in the adhesives with a 50/50 (2MP/HEMA) mass ratio. Conversion values of the plasma-cured groups were higher than those of light-cured samples with the same mass ratio and water content. Spectral differences between the plasma- and light-cured groups indicate subtle structural distinctions in the resultant polymer networks. Significance This research if the first to demonstrate that the non-thermal plasma brush induces polymerization of model adhesives under clinical settings by direct/indirect energy transfer. This device shows promise for polymerization of dental composite restorations having enhanced properties and performance.

show abstract

“…Novel possibilities for creating hydrogel systems based on glow discharge plasma polymerization of volatile monomers in gas phase [41], solid phase plasma polymerization [42], and plasma polymerization in liquids [43] have been reported. Among them, plasma polymerization in liquids and in contact with liquids demonstrates great technological potential given that it can be performed without using chemical initiators or/and even without cross-linking agents.…”

Section: Novel Strategies For Pnipaam-based Hydrogel Synthesismentioning

confidence: 99%

Novel Synthesis Pathways for PNIPAAm-Based Hydrogels and Their Application in Thermosensitive Textiles

Jovančić

Petruš̆̌̌̌ić

Molina

2014

Handbook of Smart Textiles

View full text Add to dashboard Cite

The research focus is lately directed towards the development of the thermosensitive textiles with advanced functionalities. As sources of inspiration for a progress in the field of these innovative materials, stimuli-sensitive polymer engineering, plasma surface engineering, and nanotechnology have been extensively explored. In this work, the polymerization methods for synthesis of Poly(N-isopropylacrylamide), PNIPAAm-based hydrogels, incorporating natural biopolymers (chitosan and b-cyclodextrin), for achieving dual temperature/pH sensitivity and improvement of relevant loading capacity towards specific guest molecules are outlined. These PNIPAAm-based hydrogels are of great interest for biomedical applications (transdermal drug delivery, cell encapsulation, wound dressing, tissue repair, etc.) and intelligent stimuli-sensitive textile coatings for moisture regain control, antimicrobial properties, water and/or oil repellency, and fragrance release. The strategies for synthesis of PNIPAAm-based hydrogels (macro and micro forms) and their proper integration onto textiles through the plasma surface modification, graft polymerization, and coatings are discussed. Novel possibilities for creating hydrogels based on atmospheric plasma polymerization of NIPAAm monomers in liquids have alos been reported. Plasma polymerization in liquids demonstrated a great technological potential given that it may be performed without the use of chemical initiators and even without cross-linking agents, offering multiple advantages over the conventional hydrothermal polymerization methods. Further research on adequate chemical and physical structures of PNIPAAm-based hydrogels and methods of their applications in textiles could boost a progress in the domain of smart textiles, implying novel performances and end uses.

show abstract

Plasma‐induced, solid‐state polymerization of N‐isopropylacrylamide

Cited by 8 publications

References 22 publications

Synthesis of Thermo-Sensitive Hydrogels from Free Radical Copolymerization of NIPAAm with MBA Initiated by Atmospheric Plasma Treatment

Synthesis of Thermo-Sensitive Hydrogels from Free Radical Copolymerization of NIPAAm with MBA Initiated by Atmospheric Plasma Treatment

Effect of a non-thermal, atmospheric-pressure, plasma brush on conversion of model self-etch adhesive formulations compared to conventional photo-polymerization

Novel Synthesis Pathways for PNIPAAm-Based Hydrogels and Their Application in Thermosensitive Textiles

Contact Info

Product

Resources

About