Intelligent networks based on poly(oxyethylene)

Tsvetanov, Christo B.; Stamenova, Rayna; Dotcheva, Dobrinka; Doytcheva, Maria; Belcheva, Nadya; Smid, Johannes

doi:10.1002/masy.19981280117

Cited by 18 publications

(20 citation statements)

References 25 publications

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“…Changing the density of these fragments in PU chains one can regulate the hydrophilic–hydrophobic balance in the modified PEGs, thus influencing their physicochemical properties. This paper is a new contribution to the two currently known methods28–34 for chemical modification of PEG: γ− and UV‐irradiation.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and properties of water soluble polyurethanes based on poly(ethylene glycol)

Doseva

Shenkov

Vasilev

et al. 2004

J of Applied Polymer Sci

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Water soluble polyurethanes (WSPU)s have been prepared by polycondensation of isophorondiisocyanate and tolylene-2,4-diisocyanate with poly(ethylene glycol)s (PEGs) of molecular weights 400, 600, and 1,000. The physicochemical properties of the WSPUs depend on the hydrophilic-hydrophobic balance in their polymeric chain, i.e., the properties are determined by relative density of the hydrophobic diisocyanate residues in WSPU. X-ray and differential scanning calorimetry studies show that the WSPUs have a degree of crystallinity lower than that of the pure PEGs of the same molecular weights. Like the PEGs the WSPUs prepared form interpolymer complexes with polyacrylic (PAA) and polymethacrylic (PMAA) acids. These complexes are more stable than the (PEG.PAA) and (PEG. PMAA) complexes. The novel compounds can be considered as modified linear PEGs.

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Section: Resultsmentioning

confidence: 99%

Synthesis and properties of water soluble polyurethanes based on poly(ethylene glycol)

Doseva

Shenkov

Vasilev

et al. 2004

J of Applied Polymer Sci

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“…Recently, more and more attention has been paid to polymer gels with novel properties,1–5 and they have been widely applied in areas such as absorbents, separation media, and controlled release of pharmaceutical and agricultural agents. Poly(ethylene glycol) (PEG), a biodegradable polymer, has been extensively studied as a polymer drug carrier because of its nontoxicity and non‐immunogenity.…”

Section: Introductionmentioning

confidence: 99%

“…With the development of new methods of creating polymer network structures, the applications of PEG gels have become more widespread. Films of PEG blends can be efficiently cross‐linked by UV irradiation in the presence of a hydrogen‐abstracting photoinitiator 4. The resulting material is promising for use in drug‐delivery systems, polymer electrolytes, membrane technology, sensors and polymer‐supported phase‐transfer catalysis.…”

Section: Introductionmentioning

confidence: 99%

The Critical Lowest Molecular Weight for PEG to Crystallize in Cross‐Linked Networks

Qiao¹,

Jiang²,

Dong³

et al. 2004

Macromol. Rapid Commun.

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Summary: Poly(ethylene glycol) (PEG) networks were synthesized by γ‐irradiation. The crystalline behavior of PEG was investigated by differential scanning calorimetry (DSC) and wide‐angle X‐ray diffraction (WAXD). It was shown that the crystallinity of PEG is dramatically lower in the cross‐linked networks than in pure PEG. When the molecular weight of PEG in the networks decreased to 1 000, it could not crystallize at all. Moreover, we also found that the melting temperature of PEG is greatly affected by the presence of a cross‐linked network.The DSC curves of PEG ($\overline M _{\rm w}$ = 1 500) and the corresponding cross‐linked PEG.imageThe DSC curves of PEG ($\overline M _{\rm w}$ = 1 500) and the corresponding cross‐linked PEG.

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“…It is used to obtain stimuli-responsive networks [14][15][16][17]. Linear PEO however has an LCST of over 100°C [18,19].…”

Section: Introductionmentioning

confidence: 99%

Glutaraldehyde-crosslinked poly(glycidol-block-ethylene oxide-block-glycidol) networks with temperatureresponsive swelling behaviour

et al. 2003

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In order to obtain temperature-responsive hydrogel networks, poly-(glycidol-block-ethylene oxide-block-glycidol) copolymers were chemically crosslinked by using glutaraldehyde and tetraethoxysilane in a sol-gel reaction. The crystallinity of copolymer networks prepared has been estimated by differential scanning calorimetry. Thermo-responsive properties were evaluated by measuring the equilibrium swelling degree for a series of copolymer hydrogels as a function of temperature.

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Intelligent networks based on poly(oxyethylene)

Cited by 18 publications

References 25 publications

Synthesis and properties of water soluble polyurethanes based on poly(ethylene glycol)

Synthesis and properties of water soluble polyurethanes based on poly(ethylene glycol)

The Critical Lowest Molecular Weight for PEG to Crystallize in Cross‐Linked Networks

Glutaraldehyde-crosslinked poly(glycidol-block-ethylene oxide-block-glycidol) networks with temperatureresponsive swelling behaviour

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