Semi-interpenetrating polymer networks based on polyurethane and poly(2-hydroxyethyl methacrylate): Dielectric study of relaxation behavior

Karabanova, L. V.; Boiteux, Gisèle; Seytre, Gérard; Stevenson, Isabelle; Gain, Olivier; Hakmé, Chady; Lutsyk, E. D.; Svyatyna, Anna V.

doi:10.1016/j.jnoncrysol.2009.05.002

Cited by 14 publications

(24 citation statements)

References 35 publications

(70 reference statements)

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“…The composition of the polymer matrix fixed to 83 wt % PU-17 wt % PHEMA, on the basis of results obtained with the semi-IPNS in previous work. 33 Scanning Electron Microscopy Morphology was examined by field emission Scanning Electron Microscopy FEI NovaSEM 230 operating in high vacuum mode, using either Everhart-Thornley (ETD) or Through SCHEME 1 The structure of polyurethane network.…”

Section: Nanocomposite Samples Preparationmentioning

confidence: 99%

“…This is in agreement also with results on several PU-PHEMA semi-IPN compositions investigated earlier. 29,33 For that reason we use, already at this stage, the terms PUrich and PHEMA-rich phase for the two phases giving rise to the two glass transitions to be reported below.…”

Section: Full Papermentioning

confidence: 99%

“…T g of the PU-rich phase was found to be practically independent from composition, whereas T g of the PHEMA-rich phase was found to systematically shifted to lower temperatures with decreasing PHEMA fraction. 29,33 This means that T g of the PU-rich phase (at low temperature) remains unaffected, whereas that T g of the PHEMA-rich phase (at high temperature) becomes lower due to plastification of this phase by presence of PU's chains. It is interesting to note in this connection that DMA and DRS measurements in sequential poly(butyl acrylate)-poly(butyl methacrylate) (PBA-PBMA) IPNS with low cross-linking density showed, in agreement to each other, that the IPNS were microphase separated and that the glass transition temperature and the segmental dynamics of the low-T g PBA-rich phase were independent of composition, whereas those of the high-T g PBMA-rich phase were plasticized with increasing PBA fraction.…”

Section: Full Papermentioning

confidence: 99%

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Hydrophilic nanocomposites based on polyurethane/poly(2‐hydroxyethyl methacrylate) semi‐IPNs and modified/unmodified nanosilica for biomedical applications

Stamatopoulou

Klonos

Koutsoumpis

et al. 2013

J Polym Sci B Polym Phys

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Nanocomposites based on sequential semiinterpenetrating polymer network (semi-IPN) of cross-linked polyurethane and linear poly(2-hydroxyethyl methacrylate) with 0.25 and 3 wt % of nanosilica filler were prepared and investigated. The unmodified silica, carboxyl-modified, and amino-modified silica were used in an attempt to control the microphase separation of the polymer matrix by polymer-filler interactions. A variety of experimental techniques were used to study morphology, thermal transitions, mechanical properties, and polymer dynamics of the nanocomposites. Special attention was paid to the investigation of the hydration properties of the nanocomposites in the perspective of biomedical appli-cations. The results show that the good hydration properties of the semi-IPN matrix are preserved in the nanocomposites. Effects of water on polymer dynamics were found to be particularly pronounced for the secondary b sw , PHEMA and the b PU relaxations, in agreement with interpretations in terms of hydrogen bonding interactions with specific groups in the structure of the two polymers.

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Section: Nanocomposite Samples Preparationmentioning

confidence: 99%

Section: Full Papermentioning

confidence: 99%

Section: Full Papermentioning

confidence: 99%

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Hydrophilic nanocomposites based on polyurethane/poly(2‐hydroxyethyl methacrylate) semi‐IPNs and modified/unmodified nanosilica for biomedical applications

Stamatopoulou

Klonos

Koutsoumpis

et al. 2013

J Polym Sci B Polym Phys

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“…It is quite obvious because of the fact that NBR is a random copolymer having no regular structure. However, with the incorporation of the PU-SiO 2 in the NBR matrix, significant Tan et al -eXPRESS Polymer Letters Vol.6, No.7 (2012) 588-600 [32]. The elongation at break of the NBR/(PUSiO 2 ) blends increases with the addition of PUSiO 2 and exceeds those of the neat NBR and PU-SiO 2 , which exhibits that the incorporation of PU-SiO 2 hybrid network does not deteriorate the elasticity of the NBR.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Novel blends of acrylonitrile butadiene rubber and polyurethane-silica hybrid networks

Tan¹,

Wang²,

Tai³

et al. 2012

Express Polym. Lett.

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Abstract. Novel blends of acrylonitrile butadiene rubber (NBR) and polyurethane-silica (PU-SiO 2 ) hybrid networks have been prepared by melt blending. The PU-SiO 2 hybrid networks were formed via the reaction of NCO groups of NCO-terminated PU prepolymer and OH groups of SiO 2 in the absence of an external crosslinking agent (i.e. alcohols and amines) during the curing process of NBR. Both in the neat PU-SiO 2 system and the NBR/(PU-SiO 2 ) system, the NCO-terminated PU prepolymer could be crosslinked by SiO 2 to form PU-SiO 2 hybrid networks. The effects of PU-SiO 2 introduction into the NBR, on the properties of the resulting blends were studied. It was found that the vulcanization was activated by the incorporation of PU-SiO 2 . Transmission electronic microscopy (TEM) studies indicated that the interpenetration and entanglement structures between NBR and PU-SiO 2 increased with increasing PU-SiO 2 content and the quasi-interpenetrating polymer networks (quasi-IPN) structures were formed when the PU-SiO 2 was 50 wt% in the NBR/(PU-SiO 2 ) systems. The microstructures formed in the blends led to good compatibility between NBR and PU-SiO 2 and significantly improved the mechanical properties, abrasion resistance and flex-fatigue life of the blends.

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“…Semi-IPNs create an opportunity to synthesise PU-PHEMA based composites that retain the biocompatibility of PHEMA and acquire better stability and mechanical properties due to the PU component. In our previous publications, semi-IPNs based on PU and PHEMA were synthesised 22 and studied using small angle X-ray scattering (SAXS), 23 thermodynamic miscibility analysis, dynamic mechanical analysis (DMA), 22 dielectric relaxation spectrometry (DRS), 24 differential scanning calorimetry (DSC) and laser-interferometric creep rate spectroscopy (CRS) measurements. 25 The SAXS study showed that the semi-IPNs were biphasic systems with incomplete phase separation and a nanoheterogeneous structure with characteristic quasi-periodicities of 6-9 and 22-27 nm as a consequence of spinodal decomposition.…”

Section: Introductionmentioning

confidence: 99%

Polyurethane–poly(2-hydroxyethyl methacrylate) semi-IPN–nanooxide composites

et al. 2013

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Two sets of hybrid polyurethane-poly(2-hydroxyethyl methacrylate) semi-interpenetrating polymer network-nanooxide composites with 0.25 or 3 wt% nanosilica or nanoalumina functionalised with OH, NH 2 or CHLCH 2 groups were prepared. A combination of atomic force microscopy, infrared spectroscopy, thermally stimulated depolarisation current measurement, differential scanning calorimetry and creep rate spectroscopy analysis of the nanostructure and properties of the composites was performed. The pronounced dynamic heterogeneity and the strong impact of oxide additives, basically suppression of the dynamics and temperature-dependent increasing modulus of elasticity, were observed. The effects correlated with either interfacial interactions (for silica) or the nanostructure (for alumina). A low oxide content strongly affected the matrix due to the formation of an unusual cross-linked, via double covalent hybridisation of three components, structure of the nanocomposites.

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Semi-interpenetrating polymer networks based on polyurethane and poly(2-hydroxyethyl methacrylate): Dielectric study of relaxation behavior

Cited by 14 publications

References 35 publications

Hydrophilic nanocomposites based on polyurethane/poly(2‐hydroxyethyl methacrylate) semi‐IPNs and modified/unmodified nanosilica for biomedical applications

Hydrophilic nanocomposites based on polyurethane/poly(2‐hydroxyethyl methacrylate) semi‐IPNs and modified/unmodified nanosilica for biomedical applications

Novel blends of acrylonitrile butadiene rubber and polyurethane-silica hybrid networks

Polyurethane–poly(2-hydroxyethyl methacrylate) semi-IPN–nanooxide composites

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