Thermoresponsive copolymers with pendant <scp>d</scp>-galactosyl 1,2,3-triazole groups: synthesis, characterization and thermal behavior

Dhumure, Archana Baburao; Patil, Ajay B.; Kulkarni, Anuja S.; Voevodina, Irina; Scandola, Mariastella; Shinde, Vaishali

doi:10.1039/c5nj01334h

Cited by 12 publications

(9 citation statements)

References 35 publications

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“…The DSC curves of PHEMA, PNIPAM, and PHN are shown in Figure 4 , all of which have an endothermal baseline shift associated with the glass transition temperature ( T g ) at 95, 125, and 118 °C, respectively [ 25 , 26 ]. As shown in the DSC curve of PHN, there is no peaks showing crystallization or melting in the heating range.…”

Section: Results Discussionmentioning

confidence: 99%

“…These results indicate that the improved thermal stability of PHN as compared to those of PHEMA and PNIPAM, which could be related to the formation of the copolymer through covalent bonds, as well as the intramolecular and intermolecular hydrogen bonds between -NH and -OH in the copolymer chains. The DSC curves of PHEMA, PNIPAM, and PHN are shown in Figure 4, all of which have an endothermal baseline shift associated with the glass transition temperature (T g ) at 95, 125, and 118 • C, respectively [25,26]. As shown in the DSC curve of PHN, there is no peaks showing crystallization or melting in the heating range.…”

Section: Formation Of Phn Polymermentioning

confidence: 99%

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Improved Dimensional Stability and Mold Resistance of Bamboo via In Situ Growth of Poly(Hydroxyethyl Methacrylate-N-Isopropyl Acrylamide)

et al. 2020

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Bamboo is a natural and renewable building material but its application has been limited due to the low dimensional stability and poor durability against mold. In this study, monomers of hydroxyethyl methacrylate (HEMA) and N-isopropyl acrylamide (NIPAM) were impregnated in bamboo to facilitate the in situ growth of poly-HEMA and NIPAM (PHN) copolymer. Prior to that, the effects of different reaction conditions, including the molar ratio of HEMA to NIPAM and their concentrations, the amount of initiator (ammonium persulfate, APS) and crosslinking agents (N,N′-Methylenebisacrylamide (MBA), and glutaric dialdehyde (GA)) on the swelling capacity of PHN were optimized. The formation of PHN was confirmed by using Fourier transform infrared spectroscopy and thermogravimetric analysis, which shows the characteristics peaks of both HEMA and NIPAM, and increased pyrolysis and glass transition temperatures, respectively. After impregnation of PHN pre-polymerization formulation to bamboo, it was observed that PHN filled most of the pits in the bamboo cell wall and formed a tight network. Moreover, the dimensional stability of PHN treated bamboo was significantly improved with an anti-swelling efficiency of 49.4% and 41.7%, respectively, after wetting–drying and soaking–drying cycles. A mold infection rate of 13.5% was observed in PHN-treated bamboo as compared to a 100% infected control group after a 30-day mold resistance test. Combined results indicate that in situ polymerization of HEMA and NIPAM in bamboo is a promising method to develop exterior used bamboo products with enhanced dimensional stability and mold resistance.

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Section: Results Discussionmentioning

confidence: 99%

Section: Formation Of Phn Polymermentioning

confidence: 99%

Improved Dimensional Stability and Mold Resistance of Bamboo via In Situ Growth of Poly(Hydroxyethyl Methacrylate-N-Isopropyl Acrylamide)

et al. 2020

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“…The effects most likely depend on every studied polymer without a certain temperature shifting towards a lower or higher value. The results of the DSC investigation showed an increase in glass transition temperature (T g ), a new degradation peak and splitting of the thermal degradation at more than one stage [45,46].…”

Section: Resultsmentioning

confidence: 99%

Grafting versus Crosslinking of Silk Fibroin-g-PNIPAM via Tyrosine-NIPAM Bridges

et al. 2019

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This paper reports the synthesis and complex characterization of novel polymeric networks based on the crosslinking of Bombyx mori silk fibroin via poly(N-isopropylacrylamide) bridges generated by an ammonium cerium nitrate redox system. The research study gives an understanding of the polymerization mechanism in terms of the generation of radical sites, radical growth and termination reaction, as well as the involvement of modifications on silk fibroin structure and properties. The physico-chemical characterization was carried out by FTIR-ATR, X-ray photoelectron spectroscopy and RAMAN spectroscopy with unravelling the chemical modification. The structural characterization and spatial arrangement by secondary structure were carried out by X-ray diffraction and circular dichroism. The thermal behavior and thermal stability were evaluated by differential scanning calorimetry and thermogravimetric analysis. The novel complex polymer network is intended to be used in the field of smart drug delivery systems.

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“…Figure 5 reveals the endothermic peak of PNIPAM at 135 °C, in agreement with the earlier studies. 33 The DSC curve of DMOF does not show any thermal effect in the temperature range from 80 to 190 °C. The DMOF ⊃ PNIPAM- 1 , 2 , and 3 composites show a phase transition at about 140, 160, and 180 °C, respectively, indicated by the endothermic peak observed in DSC.…”

Section: Resultsmentioning

confidence: 90%

Water–Ethanol and Methanol–Ethanol Separations Using in Situ Confined Polymer Chains in a Metal–Organic Framework

Tang

Dubbeldam

Tanase

2019

ACS Appl. Mater. Interfaces

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This study presents a straightforward approach for the in situ polymerization of poly(N-isopropylacrylamide) (PNIPAM) chains within the one-dimensional (1D) pores of the five-coordinated zinc-based metal–organic framework DMOF in order to obtain new MOF-based composites. The loading amount of PNIPAM within DMOF ⊃ PNIPAM composites can be tuned by changing the initial weight ratio between NIPAM, which is the monomer of PNIPAM, and DMOF. The guest PNIPAM chains in the composites block partially the 1D pores of DMOF, thus leading to a narrowed nanospace. The water adsorption studies reveal that the water uptake increased by increasing the loading of PNIPAM in the final DMOF ⊃ PNIPAM composites, indicating that the exposed amide groups of PNIPAM gradually alter the hydrophobicity of pristine DMOF and lead to hydrophilic DMOF ⊃ PNIPAM composites. The composite with the highest loading of PNIPAM displays a selective adsorption for water and methanol over ethanol when using equimolar mixtures of methanol–ethanol and water–ethanol. This is confirmed by the single-component adsorption measurements as well as ideal adsorbed solution theory molecular simulations. Additionally, the water stability of pristine DMOF has been greatly improved after the incorporation of PNIPAM in its pores. PNIPAM can undergo a phase transition between hydrophobic and hydrophilic phases in response to a low temperature change. This property is used in order to control the desorption of water and methanol molecules, thus enabling an efficient and cost-effective regeneration process.

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Thermoresponsive copolymers with pendant d-galactosyl 1,2,3-triazole groups: synthesis, characterization and thermal behavior

Abstract: A series of glycopolymers containing d-galactosyl 1,2,3-triazole groups were synthesized which exhibited thermosensitivity properties.

Cited by 12 publications

References 35 publications

Improved Dimensional Stability and Mold Resistance of Bamboo via In Situ Growth of Poly(Hydroxyethyl Methacrylate-N-Isopropyl Acrylamide)

Improved Dimensional Stability and Mold Resistance of Bamboo via In Situ Growth of Poly(Hydroxyethyl Methacrylate-N-Isopropyl Acrylamide)

Grafting versus Crosslinking of Silk Fibroin-g-PNIPAM via Tyrosine-NIPAM Bridges

Water–Ethanol and Methanol–Ethanol Separations Using in Situ Confined Polymer Chains in a Metal–Organic Framework

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