Binary blends based on poly(<i>N</i>‐isopropylacrylamide): Miscibility studies with PVA, PVP, and PAA

Mano, Valdir; Silva, Maria Elisa Scarpelli Ribeiro e; Barbani, Niccoletta; Giusti, P.

doi:10.1002/app.20027

Cited by 34 publications

(28 citation statements)

References 25 publications

(26 reference statements)

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“…All the observed transition temperatures show variation compared to their theoretical values calculated by equation (1). This deviation from the theoretical value of the glass transition temperature is also observed in an earlier report 20 in which they attributed this behavior to deviation with respect to free volume linearity in the blends. Changes in the free volume are related to specific interactions between polymer chains, increasing specific interactions lead to the formation of a more compact molecular network and diminish the free volume of molar chains.…”

supporting

confidence: 78%

“…However, polyvinyl alcohol (PVA) -Methacrylic AcidEthyl Acrylate (MAA:EA) polymer blend electrolyte has yet to be studied. In the present work, structural, optical and thermal properties of PVA/MAA:EA blends in the range of composition 80: 20 were prepared by using distilled water. The solution was stirred magnetically for 10-12 hours to get a homogeneous mixture and then cast onto plastic dishes.…”

Section: Introductionmentioning

confidence: 99%

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Structural, Optical and Thermal Characterizations of PVA/MAA:EA Polyblend Films

et al. 2018

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Films of polyvinyl alcohol (PVA), Methacrylic Acid -Ethyl Acrylate (MAA:EA) copolymer and their blends PVA:MAA:EA of composition 80:20, 60:40, 50:50, 40:60, 20:80 (wt %) were prepared by using the solution cast technique. The prepared films were investigated by structural, optical and thermal studies. X-ray diffraction (XRD) scans revealed the semicrystalline nature of the blends for lower concentrations of PVA up to 60 wt % and the amorphous nature for higher ones. Fourier transform infra-red spectroscopy (FTIR) of blend samples indicates that there is a compatibility between PVA and MAA:EA copolymers through the formation of hydrogen-bonding between their polar groups. SEM image of polymer blend suggested the presence structural reorganization of polymer chains. UV-Visible spectral analysis revealed that the intensity of the shoulder around 271 nm decreases with increasing MAA:EA content. In DSC analysis, a single glass transition temperature for each blend was observed, which supports the existence of compatibility of such systems. From the observed results, 50:50 (wt %) PVA/MAA:EA is found to be the optimum blending ratio.

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confidence: 78%

Section: Introductionmentioning

confidence: 99%

Structural, Optical and Thermal Characterizations of PVA/MAA:EA Polyblend Films

et al. 2018

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“…To solve this problem, many studies have focused on the preparation of blends and copolymers and on the formation of interpenetrating polymer networks. Following this principle, we have previously reported 24,25 the preparation of blends of PNIPAAm with poly(vinyl alcohol) (PVAl), poly(vinyl pyrrolidone) (PVP), poly(acrylic acid) (PAA), and poly(ethylene-co-vinyl alcohol) (EVAL).…”

Section: Introductionmentioning

confidence: 99%

Bioartificial polymeric materials based on collagen and poly(N-isopropylacrylamide)

Mano

Silva

2007

Mat. Res.

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Films of collagen (CLG) and poly(N-isopropylacrylamide), PNIPAAm, were prepared by casting from water solutions. These bioartificial polymeric materials were studied to examine the influence of PNIPAAm content and glutaraldehyde vapor cross-linking on the thermal and biological stability of CLG. Mixtures, ranging from 20-80 wt% CLG composition, were cross-linked through exposure to glutaraldehyde vapors. Thermal and morphological properties of the films, cross-linked or not, were investigated by differential scanning calorimetry, thermogravimetry, and scanning electron microscopy, with the aim of evaluating miscibility, thermal stability, and interactions among the constituents. The experimental results indicated that the homopolymers are not thermodynamically compatible. However, there is good evidence that effective interactions, probably due to hydrogen bond formation, takes place between the constituents. These interactions are more evident on the samples that were not cross-linked. DSC studies revealed that PNIPAAm exerts a thermal stabilizing effect on uncross-linked CLG, while the cross-linking with glutaraldehyde affects only the biological polymer, preventing the interactions with PNIPAAm. SEM micrographs of the uncross-linked mixtures showed that the morphology, in all compositions studied, remains similar to the pure collagen. In the corresponding cross-linked samples, a more compact aggregation is observed although no appreciably changes can be seen.

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“…[1][2][3] The properties of the blend depend on the degree of compatibility or miscibility of the polymers at molecular mixing; blends can be classified as a compatible blend or completely miscible and incompatible or immiscible blends. [4][5][6] The polymer miscibility is due to some specific interactions such as dipole-dipole forces, hydrogen bonding, and charge transfer complex between the polymer segments. 7 It is estimated that at least 70% of the compounds in use today are based on polymer blends.…”

mentioning

confidence: 99%

Silver‐Doped Zinc Oxide as a Nanofiller for Development of Poly(vinyl alcohol)/Poly(vinyl pyrrolidone) Blend Nanocomposites

et al. 2016

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Nanocomposites of poly(vinyl alcohol) (PVA)/poly(vinyl pyrrolidone) (PVP)/silver-doped zinc oxide (Ag-doped ZnO) ternary blends were prepared and characterized by Fourier transform infrared (FTIR) spectroscopy, ultraviolet (UV), scanning electron microscopy (SEM), X-ray diffraction (XRD), Differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and conductivity studies. The FTIR and UV spectrum indicated the intermolecular interaction between the polar part of blend and the metal oxide nanoparticles. SEM and XRD patterns ascertained the structurally ordered arrangements of nanoparticles within the polymer matrix. The DSC results showed that the addition of Ag-doped ZnO particles to PVA/PVP decreases the thermal behavior such as glass transition and melting temperature of the blend. The TGA study indicated that the composites attained better thermal resistance than a pure blend and the thermal stability of the composite increases with an increase in the concentration of nanoparticles. The electrical properties such as AC conductivity and dielectric properties of the composites were increased with an increase in content of nanoparticles up to a certain concentration (5 wt%), and thereafter the value was found to decrease. C

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Binary blends based on poly(N‐isopropylacrylamide): Miscibility studies with PVA, PVP, and PAA

Cited by 34 publications

References 25 publications

Structural, Optical and Thermal Characterizations of PVA/MAA:EA Polyblend Films

Structural, Optical and Thermal Characterizations of PVA/MAA:EA Polyblend Films

Bioartificial polymeric materials based on collagen and poly(N-isopropylacrylamide)

Silver‐Doped Zinc Oxide as a Nanofiller for Development of Poly(vinyl alcohol)/Poly(vinyl pyrrolidone) Blend Nanocomposites

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