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Porous films were fabricated from nonporous layer-by-layer multilayers composed of a blend of positively charged disulfide-containing polyamidoamine and poly(allylamine hydrochoride), and negatively charged poly(acrylic acid), followed by removal of cleavable disulfide-containing polycation after incubation in 1 mM DTT solution. The thickness of original multilayered films decreased with the increase...
The primary aim of this paper is to explore the influence of the number of CH 2 groups per –(CH 2 ) n OCOO– repeat unit (Num c ) on the properties of poly(alkylene carbonate)s. A series of poly(alkylene carbonate)s with different Num c , including PTMC (Num c = 3), PTeMC (Num c = 4), PPMC (Num c = 5), PHMC (Num c = 6) and...
An amphiphilic diblock copolymer of poly(acrylic acid-b-dl-lactide) (PAAc-b-PDLLA) was synthesized by ring-opening polymerization of dl-lactide initiated by hydroxyl-terminated polyacrylic acid (PAAc-OH). The critical micelle concentration (CMC) of PAAc-b-PDLLA in aqueous solution, determined by fluorescence spectroscopy using pyrene as a probe, was found about 80mgL −1 . A solution of PAAc-b-PDLLA...
Novel star-shaped copolymers, comprised of a thermo-sensitive poly(N-isopropylacrylamide) (PNIPAAm) segment and three hydrophobic poly(ɛ-caprolactone) (PCL) arms were fabricated. The copolymers were prepared by stannous octoate (Sn(Oct) 2 ) catalyzed ring-opening polymerization of ɛ-caprolactone (CL) using cholic acid functionalized PNIPAAm as the macroinitiator. The lower critical solution...
A novel six-membered cyclic carbonate with pendent allyl ether group, 5-allyloxy-1,3-dioxan-2-one (ATMC), was synthesized from glycerol, and the corresponding polycarbonate, poly(5-allyloxy-1,3-dioxan-2-one) (PATMC) was further synthesized by ring-opening polymerization in bulk at 120°C. Two kinds of catalyst, tin(II) 2-ethylhexanoate (Sn(Oct) 2 ) and immobilized porcine pancreas lipase on...
Three poly(beta-aminoester)s with pendant primary amines were synthesized by Michael addition of N-Boc-protected diamine to 1,4-butanediol diacrylate, followed by removal of N-Boc-protective group under anhydrous acidic conditions. The degradation rate of poly(beta-aminoester)s with pendant primary amines is dependant on their side-chain structures and pH value of incubation buffer. The degradation...
In this paper, we reported the synthesis and properties of novel hydrogel systems designed for colon targeted drug delivery. The gels were composed of konjac glucomannan (KGM), copolymerized with acrylic acid (AA) and cross-linked by N,N-methylene-bis-(acrylamide) (MBAAm). The influence of various parameters on the equilibrium swelling ratios of the hydrogels was investigated. The swelling ratio was...
A crown ether derivative (4'-allyldibenzo-18-crown-6, CE) was covalently incorporated into the network of temperature sensitive poly(N-isopropylacrylamide) (PNIPA) hydrogels by copolymerization in a mixed solvent of water and tetrahydrofuran (H 2 O/THF). The poly(N-isopropylacrylamide-co-4'-allyldibenzo-18-crown-6) (poly(NIPA-co-CE)) hydrogels exhibited dramatically faster deswelling rates...
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