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A feasible co-endcapping strategy has been developed for the synthesis of monofunctional polyhedral oligomeric silsesquioxanes (POSS) modified waterborne polyurethane (WPU). The work starts from the synthesis of di-isocyanate terminated PU prepolymer from isophorone di-isocyanate (IPDI), poly (1,4-butylene adipate) end-capped diol (PBAD), and 2,2-bis(hydroxymethyl) butyric acid (DMBA). The two kinds...
A new epoxide-terminated hyperbranched polyether sulphone (EHBPES) was synthesized using simple one-pot A2+B3 approach. This highly effective toughener can toughen diglycidyl ether of bisphenol A/triethylenetetramine (DGEBA/TETA) curing system without forming phase-separated morphology. Effects of molecular weight (MW) and loading amounts on the mechanical and thermal properties of cure hybrids were...
In this work, the reversible addition-fragmentation chain transfer (RAFT) polymerization was utilized to synthesize the amphiphilic diblock copolymers of poly(methacrylic acid)-b-poly(2,2,2-trifluoroethyl methacrylate) (PMAA-b-PTFEMA) via one-pot two-step reaction protocol. The controlled radical polymerization of MAA monomer was first carried out in pure water by using 4-cyanopentanoic acid dithiobenzoate...
A novel alternating D–A copolymer, PPor–BT, with dioctylporphyrin (Por) as a donor unit and 5,6-bis(octyloxy)benzo-2,1,3-thiadiazole (BT) as an acceptor unit, was designed and synthesized by Pd-catalyzed Sonogashira-coupling reaction. The copolymer showed good solubility and film-forming ability. PPor–BT exhibited a broad absorption band from 350 to 950 nm with two peaks centered at 456 and 818 nm...
A kinetic study on the ring-opening polymerization (ROP) of octamethylcyclotetrasiloxane (D4) in miniemulsion is presented in this work. The polymerization is initiated by dodecylbenzenesulfonic acid (DBSA) which also serves as the surfactant (inisurf). The influence of the size of monomer droplet and the concentration of DBSA on the polymerization rate were studied. Since the main place for the ROP...
Novel hyperbranched poly(phenylene oxide)s (HPPOs) with phenolic terminal groups were prepared from 4-bromo-4′,4″-dihydroxytriphenylmethane via a modified Ullmann reaction. This monomer was treated with potassium carbonate or sodium hydroxide as a base and copper chloride as a catalyst in an aprotogenic solvent, either dimethylsulphoxide (DMSO) or sulfolane. The sulfolane/NaOH system at higher temperature...
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