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There is much need in advancing rational design of synthetic cationic polymers as gene carriers. Inspired by the molecular blueprint of the famed branched polyethylenimine (bPEI), here we describe a new series of acid-labile branched poly(ortho ester amino alcohol)s (bPOEAAs) that embodies multiple design principles about polymer degradability, chain branching, and type of cationic amino groups. The...
Thin blend films of the diblock copolymer poly(3-hexylthiophene-2,5-diyl)-block-polystyrene (P3HT-b-PS) and phenyl-C61-butyric acid methyl ester (PCBM) are prepared and investigated. The morphology of films with 9, 25, 33, 50, 58 and 67% PCBM weight fraction is determined. The surface topography is probed with optical microscopy and atomic force microscopy whereas the lateral inner structures are...
An aryl amide derivative (TMB-5) was used to nucleate the poly(l-lactide)/poly(d-lactide) (PLLA/PDLA) blend for the first time. The effect of TMB-5 nucleating agent on the crystallization behavior of PLLA/PDLA blend was systematically investigated. The selective nucleation of stereocomplex (sc) crystals by incorporation of TMB-5 was realized under appropriate crystallization conditions. During the...
A new type of acid-labile cationic copolymer consisting of a hydrophilic poly(ethylene glycol) (PEG) block and a polymethacrylamide block bearing tertiary amines linked by acid-labile ortho ester rings in side chains (PAOE), with defined chain length, had been synthesized via RAFT polymerization. The copolymers could efficiently bind and condense plasmid DNA at neutral pH into narrowly dispersed nano-scale...
Semiconductive polymer shielding layers of power cable require stable volume resistivity to protect the insulation layer from stress enhancements when carbon black (CB)/polymer composite undergoes thermal cycles. For the CB-filled polymer composites, CB would often re-aggregate when temperature is close to the melting point of polymer matrix, so that the conductive network would be destroyed. Re-distribution...
Thermo-sensitive polyurethane (TSPU) solution containing varying concentration of in situ-generated TiO 2 nanoparticles was successfully prepared via an organic–inorganic hybrid technique, and the final nanocomposite membranes were formed via solution casting. Depending on the membrane formation temperature (T mf ) during casting, completely-opposite gas transport behaviors of the...
Well-defined multi-stimuli responsive fluorinated graft poly(ether amine)s (fgPEAs) were synthesized through nucleophilic substitution/ring-opening reaction of commercial poly(propylene glycol) diglycidyl ether and Jeffamine L100, followed by functionalization of hydroxyl groups in backbone by fluorinated alkyl carboxylic acid. fgPEAs are comprised of hydrophilic short poly(ethylene oxide) (PEO) and...
New phenylene-silazane-acetylene polymers, P1 and P2, have been synthesized using Sonogashira cross-coupling reactions with a new designed ethynyl-ended silylenediamine, N,N′-bis(4-ethynylphenyl)-1,1-diphenylsilylenediamine (1), as the key monomer. This also represents the first example that construction of polymers containing silazane unit with Sonogashira coupling reaction. The structures of monomer...
A series of well-defined novel water-soluble diblock copolymers containing conjugated amino-terminal polyfluorene (PF) block and coil-like poly(N-isopropylacrylamide) (PNIPAM) have been successfully synthesized through atom transfer radical polymerization (ATRP) initiated by a 2-bromoisobutyrate end-capped PF macroinitiator using CuCl/HMTETA (1,1,4,7,10,10-hexamethyltriethylenetetramine) as the catalyst...
The effects of monomer composition on the apparent chain transfer coefficient (〈C tr 〉) in reversible addition fragmentation transfer (RAFT) copolymerization were investigated. The studied RAFT systems included methyl methacrylate (MMA)/butyl acrylate (BA) mediated by 1-phenylethyl phenyldithioacetate (PEPDTA) (i.e. MMA/BA–PEPDTA), MMA/BA by 2-cyanoprop-2-yl dithiobenzoate (i.e. MMA/BA–CPDTB),...
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