Thermosets with core–shell nanodomain by incorporation of core crosslinked star polymer into epoxy resin
作者： Yuan Meng , Xing-Hong Zhang , Bin-Yang Du , Bo-Xuan Zhou , Xin Zhou
DOI: 10.1016/J.POLYMER.2010.11.046
关键词: Atom-transfer radical-polymerization 、 Materials science 、 Polystyrene 、 Polymer 、 Copolymer 、 Curing (chemistry) 、 Glass transition 、 Epoxy 、 Polymer chemistry 、 Diglycidyl ether
摘要: Abstract Core crosslinked star (CCS) polymers, which have poly (divinyl benzene-co-styrene) [P(DVB-St)] core and multiple arms of polystyrene- b -poly(ethylene oxide) diblock copolymer (PEO- -PS) [denoted as PEO- -PS/P(DVB-St) CCS], were synthesized via atom transfer radical polymerization(ATRP). CCS polymer was spherical with average diameters scores nanometers from transmission electron microscopy (TEM) dynamic light scattering (DLS), blended diglycidyl ether bisphenol (DGEBA) 4,4′-diamino diphenyl methane (DDM) in tetrahydrofuran (THF). With 5 or 10 wt% polymer, core–shell nanodomains 29 32 nm observed atomic force (AFM), randomly distributed the resultant thermosets. Considering difference miscibility epoxy P(DVB-St) -PS after before curing reaction, a reaction-induced microphase separation (RIMPS) mechanism proposed to account for formation During curing, RIMPS PS subchain occurred but confined by core, resulting thermoplastic shell around core. Such nanodomain could be easily etched away THF, whereas control thermosets containing PEO/P(DVB-St) not THF. The glass transition temperatures ( T g s) significantly improved compared pure
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