Water-soluble temperature-responsive poly(vinyl alcohol- co -vinyl acetal)s

Christova, Darinka; Ivanova, Sijka; Ivanova, Galya

doi:10.1007/s00289-003-0178-4

Cited by 36 publications

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“…31 Special morphologies for pNIPAM-based thermoresponsive materials such as hydrogel nanoparticles, 32 poly(l-lactic acid) microcapsules as a pNIPAM gel container, 33,34 shell-crosslinked vesicles, 35 and an interpenetrating network with gelatin 36 were studied. These types of phase transition polymers are preferentially investigated for applications in biology and medicine for use in drug delivery systems, 1,13,32,33,35 carriers for gene delivery, 3 thermosensitive superabsorbents, 2 determination of enzyme concentrations, 16 and control of enzymatic activity.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and properties of new thermosensitive polymer systems

Bohrisch

Hahn

Maedler

et al. 2007

J of Applied Polymer Sci

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The controlled thermal release of aqueous solvent mixtures from polymeric gel particles was investigated. A new type of a polymeric gel consisting of a maleic anhydride/poly(ethylene glycol) condensation product as a crosslinking macromonomer and acrylamides was synthesized by solution or inverse emulsion polymerization for the investigation. Afterward a shell of crosslinked polystyrene was coated to stabilize this new kind of "microcontainer" for the application. This concept was shown as generally useful for various mixtures of organic solvents and water. The cloud point temperature of the polymer gel strongly depended on the following parameters: the type and content of organic cosolvent, the degree of polymerization and constituents of the polyester moiety, and the type and content of the comonomers

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Section: Introductionmentioning

confidence: 99%

Synthesis and properties of new thermosensitive polymer systems

Bohrisch

Hahn

Maedler

et al. 2007

J of Applied Polymer Sci

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“…The GA acts as a chemical crosslinking agent by forming acetal bridges between polymer chains [7][8][9]. The GA acts as a chemical crosslinking agent by forming acetal bridges between polymer chains [7][8][9].…”

Section: Discussionmentioning

confidence: 99%

“…For PVA (Fig.1a) the characteristic absorption peaks are at ν=3330-3350 cm -1 (O-H stretching, hydrogen bonds), ν=2940-2950 cm -1 (C-H stretching), δ=1430 cm -1 (CH 2 bending), ν=1090-1150 cm -1 (C-O and C-O-C stretching) and ν=850 cm -1 (C-C stretching). According to the literature [4,[7][8][9], this vibrational band is mostly attributed to the crystallinity of the PVA, related to C-O-C stretching. According to the literature [4,[7][8][9], this vibrational band is mostly attributed to the crystallinity of the PVA, related to C-O-C stretching.…”

Section: K192mentioning

confidence: 96%

“…The Fig.1b illustrates the FTIR spectrum PVA of crosslinked by glutaraldehyde. In addition, the C-O stretching at 1100 cm -1 in pure PVA is replaced by a broader absorption band (from ν=1000 to 1140 cm -1 ), which can be attributed to the ether (C-O) and the acetal ring (C-O-C) bands formed by the crosslinking reaction of PVA with GA (reaction scheme.1) [7][8][9]. By crosslinking PVA with GA ( Fig.1b), the O-H stretching vibration peak (ν=3330-3350 cm -1 ) was decreased when compared to pure PVA (Fig.1a).…”

Section: K192mentioning

confidence: 99%

“…This result suggests that the hydrogen bonding becomes weaker in crosslinked PVA than in pure PVA because of the diminution in the number of OH groups. Also, the presence of a shoulder at ν=1100-1150 cm -1 and a broader absorption region at ν=1425-1485 cm -1 in the infrared spectrum of PVA/TEOS indicate the presence of Si-C bonds [8][9][10]. In addition, the C-O stretching at 1100 cm -1 in pure PVA is replaced by a broader absorption band (from ν=1000 to 1140 cm -1 ), which can be attributed to the ether (C-O) and the acetal ring (C-O-C) bands formed by the crosslinking reaction of PVA with GA (reaction scheme.1) [7][8][9].…”

Section: K192mentioning

confidence: 99%

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Small Angle X-Ray Scattering, FTIR and SEM Characterization of Nanostructured PVA/TEOS Hybrids by Chemical Crosslinking

Mansur

2005

MRS Proc.

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In the present work, novel hybrid nanostructured composites were produced to be used in many potential applications such as biomedical, drug delivery systems, tri-dimensional scaffolds for biomaterials and tissue engineering, biomembranes and optical devices among others. Hybrids were synthesized by reacting poly (vinyl alcohol) (PVA) in aqueous acid solution with silicon alcoxide tetraethoxysilane (TEOS). PVA/TEOS hybrids were also modified in the nanometer-scale by crosslinking with glutaraldehyde (GA) during the synthesis involving hydrolysis and policondensation of PVA/TEOS. The hybrids were characterized by Fourier Transform Infrared Spectroscopy (FTIR), Small Angle X-ray Scattering (SAXS) and Scanning Electron Microscopy (SEM). FTIR spectra have shown major vibration bands associated with organic-inorganic chemical groups present in the hybrid composite PVA/TEOS. Also, typical absorption bands related to glutaraldehyde alkyl chain have indicated the crosslinking reaction of the hybrid network with glutaraldehyde (PVA/TEOS/GA). SAXS results have indicated different nano-ordered disperse phases for PVA, PVA/TEOS hybrid and PVA/TEOS/GA chemically crosslinked hybrid. SEM micrographs have shown morphology difference between PVA and PVA hybrid samples. EXPERIMENTAL PVA/TEOS/GA Hybrids SynthesisTEOS (Si(OC 2 H 5 ) 4 > 98%) and GA (25% aqueous) were supplied by Sigma-Aldrich. PVA (CPQ, Brazil) was obtained as a 90+ % hydrolyzed powder with a reported average K1.9.1 Mater. Res. Soc. Symp. Proc. Vol. 873E

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A novel method to prepare poly(vinyl alcohol) water‐soluble fiber with narrowly dissolving temperature range

Wang

Zhang

Jiang

et al. 2012

J of Applied Polymer Sci

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Poly(vinyl alcohol) (PVA) is an important water-soluble polymer. In this study, a novel method has been developed for preparing water-soluble PVA fiber with narrowly dissolving temperature range via wet spinning of partly acetalized PVA. The structures and properties of the fiber were characterized by IR, 1 H-NMR, DSC, WAXD, tensile strength tester, etc. IR and NMR spectra showed that acetal groups were successfully generated on the lateral chains of PVA with the catalysis of acid. As a small quantity of CH 2 O was added, the introduction of the acetal group could reduce both the hydrophilicity of amorphous region and the crystallinity of PVA water-soluble fiber, and hence narrowed the dissolving temperature range of fiber. However, the dissolving temperature range was broadened with a further increase of CH 2 O amount, because of the large decrease of crystallinity and crystallite perfection. When the CH 2 O added amount reached up to 20%, the acetalized PVA was completely insoluble, so that the spinning process could not be carried out. The breaking strengths of most acetalized fibers were beyond 4 cN/ dtex, which satisfied the ordinary use of industrial and domestic field.

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Water-soluble temperature-responsive poly(vinyl alcohol- co -vinyl acetal)s

Cited by 36 publications

References 0 publications

Synthesis and properties of new thermosensitive polymer systems

Synthesis and properties of new thermosensitive polymer systems

Small Angle X-Ray Scattering, FTIR and SEM Characterization of Nanostructured PVA/TEOS Hybrids by Chemical Crosslinking

A novel method to prepare poly(vinyl alcohol) water‐soluble fiber with narrowly dissolving temperature range

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