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Herein, a kind of multi-responsive core-crosslinked poly (thiolether ester) micelles was facilely prepared for reactive oxygen species (ROS), acid and reduction sensitive drug delivery. Firstly, a hydroxyl-rich poly (thiolether ester) (PTE) was synthesized by the thiol-ene/thiol-expoxy polymerization using ethanedithiol (EDT) and glycidylmethacrylate (GMA) as monomers. The resultant PTE was then coupled...
In order to avoid the serious melt-dripping problems caused by conventional phosphorus flame retardants, a new arylene-ether containing monomer named 2,2′-(4,4′-(1,4-phenylenebis(oxy))bis(4,1-phenylene))bis(oxy) diethanol (PBPBD) was synthesized and introduced into the PET main-chain via condensation polymerization. With the incorporation of arylene-ether units, the thermal stability and the char...
A self-cross-linkable poly(ethylene terephthalate) block copolyester (SSP-PETPx) has been synthesized via solid-state polymerization (SSP). In the SSP process, a cross-linkable monomer named 4-(phenylethynyl) di(ethylene glycol) phthalate (PEPE) is incorporated into the amorphous phase of PET. The sequence distribution of the resulted copolyester SSP-PETPx is analyzed with 1H NMR, showing that the...
A series of copolyesters containing ionic groups (PETIs-K) were synthesized by melt co-polycondensation using terephthalic acid, ethylene glycol, and potassium salt of bishydroxyethyl ester of 10-hydroxy-10-oxo-10H-phenoxaphosphine-2,8-dicarboxylic acid (DHPPO-K) as monomers. The copolyesters only with analogous phosphorus-containing heterocycles (PETPs) were also synthesized and used as a control...
Flame-retardant-free and thermo-cross-linkable copolyesters have been synthesized, and their flame retardation and anti-dripping behavior as a consequence of cross-linking during combustion were investigated in detail. TG-DSC simultaneous thermal analysis, rheological analysis, and TGA established the extent and rate of the cross-linking reaction. The extent of cross-linking depends on the content...
The hydrogen bond interactions and dynamics of the poly (methyl methacrylate) (PMMA) and poly (4-vinyl phenol) (PVPh) polymer blends were studied by a variety of advanced solid-state NMR techniques. The possible hydrogen bond interactions between the carbonyl group of PMMA and hydroxyl group of PVPh were successfully elucidated by two-dimensional 1 H– 1 H spin-exchange 13 C–...
Phosphorus-containing flame-retardant monomer entitled 9,10-dihydro-10-[2,3-di(hydroxycarbonyl)propyl]-10-phospha-phenanthrene-10-oxide (DDP) was first esterified with 1,3-propane diol, then incorporated in poly(trimethylene terephthalate) (PTT) chain via solid-state polymerization (SSP) at 200 °C. Reaction kinetics of incorporation was studied choosing 30 wt% DDP content as representative example...
Polycarbonate (PC) was blended with various loadings of novel phosphorus-containing thermotropic liquid crystalline copolyester named PHDDT to form the in situ reinforced composites (PC/PHDDT) by flake extrusion. The morphology, thermal behaviors, tensile properties and flame-retardant performances of PC/PHDDT composites were investigated. Results suggested that fine deformation and microfibrillation...
This paper describes smart hydrogels composed of pH-sensitive poly(acrylic acid) (PAA) and biodegradable temperature-sensitive hydroxypropylcellulose-g-acrylic acid (HPC-g-AA) for controlled drug delivery applications. In a pH-responsive manner, the hydrogels with the higher HPC-g-AA content resulted in the lower equilibrium swelling. Although temperature had little influence on the swelling of the...
For polymer/liquid crystal polymer (LCP) blend systems, the in-situ fibrillation of LCP in polymer matrix can result in the self-reinforcement of polymer/LCP composites. How to control the microfibrillation of LCP in matrix is a key to enhance the mechanical properties of composites. In this paper, we investigated the transesterification-controlled compatibility and microfibrillation of phosphorus-containing...
A novel amphiphilic biodegradable poly(ethylene glycol)–poly(2-methyl-2-carboxyl-propylene carbonate) (MPEG–PMBC) block copolymer was successfully synthesized by ring-opening polymerization (ROP) of 2-methyl-2-carboxyl-propylene carbonate (MBC) with MPEG as a macroinitiator. 13 C NMR and GPC confirmed its structure. It could self-assemble into micelles in aqueous solution with the critical...
A new method of the surface modified starch (SM-St) by grafting reaction of the hydroxyl groups on the starch with l-lactic acid was developed. A novel biodegradable starch grafted copolymer, starch-g-poly(l-lactide) (St-g-PLLA), was synthesized in situ by the ring-opening graft polymerization of a l-lactide (LLA) monomer onto the surface of the SM-St granules in the presence of Sn(Oct) 2 ...
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