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dc.contributor.authorLequieu, W-
dc.contributor.authorVan de Velde, P-
dc.contributor.authorDu Prez, FE-
dc.contributor.authorADRIAENSENS, Peter-
dc.contributor.authorSTORME, Liesbet-
dc.contributor.authorGELAN, Jan-
dc.identifier.citationPOLYMER, 45(23). p. 7943-7951-
dc.description.abstractSegmented polymer networks (SPNs) based on thermo-sensitive poly(N-isopropyl acryl amide) (PNIPAA) and poly(tetrahydrofuran) (PTHF) have been synthesized by free radical copolymerization of PTHF bis-macromonomers with N-isopropyl acrylamide. The nature of the polymerizable end group on the bis-macromonomer has been varied, respectively from acrylate to acrylamide end groups. The multiphase behaviour of the corresponding SPNs has been examined as a function of the nature of the end group by making use of solid-state C-13 CP/MAS NMR relaxometry, H-1 wideline NMR relaxometry and dynamic mechanical analysis (DMA). When PTHF with acrylate end groups was used during the SPN formation, analysis of proton spin-lattice relaxation times (T-1H) and proton spin-lattice relaxation times in the rotating frame (T-1pH) revealed phase separation with domain sizes larger than 5 nm when the PTHF fraction exceeds 10 wt%. Only for lower PTHF-amounts, the SPNs were homogeneous on the nanometer scale. On the other hand, when PTHF with acrylamide end groups was used as macromolecular cross-linker, the NMR results showed the absence of any domain formation for SPNs with PTHF fractions up to 50 wt%. The major impact of the molecular design on the ultimate phase morphology of bicomponent polymer networks has been confirmed in all cases by DMA-analysis.-
dc.publisherELSEVIER SCI LTD-
dc.subject.othersegmented polymer network; phase morphology; solid-state NMR-
dc.titleSolid state NMR study of segmented polymer networks: fine-tuning of phase morphology via their molecular design-
dc.typeJournal Contribution-
dc.description.notesState Univ Ghent, Dept Organ Chem, Polymer Chem Res Grp, B-9000 Ghent, Belgium. Limburgs Univ Ctr, Div Chem, Mat Res Inst, IMO, B-3590 Diepenbeek, Belgium.Du Prez, FE, State Univ Ghent, Dept Organ Chem, Polymer Chem Res Grp, Krigslaan 281 S4bis, B-9000 Ghent,
item.validationecoom 2005-
item.fulltextNo Fulltext-
item.contributorDu Prez, FE-
item.contributorSTORME, Liesbet-
item.contributorGELAN, Jan-
item.contributorADRIAENSENS, Peter-
item.contributorVan de Velde, P-
item.contributorLequieu, W-
item.fullcitationLequieu, W; Van de Velde, P; Du Prez, FE; ADRIAENSENS, Peter; STORME, Liesbet & GELAN, Jan (2004) Solid state NMR study of segmented polymer networks: fine-tuning of phase morphology via their molecular design. In: POLYMER, 45(23). p. 7943-7951.-
item.accessRightsClosed Access-
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