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An injectable hydroxyapatite/poly(lactide-co-glycolide) composite reinforced by micro/nano-hybrid poly(glycolide) fibers for bone repair
Porous nanocomposite of hydroxyapatite/poly(lactide-co-glycolide) (HA/PLGA) is conventionally used in bone tissue engineering but seldom in load-bearing orthopedic applications due to poor mechanical property. This study aimed to fabricate an injectable ternary composite by incorporating different contents of poly(glycolide) (PGA) fibers (0, 30, 50 and 70 wt%) into the nanocomposite HA/PLGA matrix...
http://www.polymer.cnt//ss/pbzhang/publicationsshow_12129.html |
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Rare-Earth-Metal Complexes Bearing Phosphazene Ancillary Ligands: Structures and Catalysis toward Highly Trans-1,4-Selective (Co)Polymerizations of Conjugated Dienes
The
bis-arylated phosphazene compounds [HN(PPh2NAr)2] (Ar =
phenyl (HL1), 2,6-dimethylphenyl (HL2),
2,6-diisopropylphenyl (HL3)) and the imidodiphosphinate compound
HN(PPh2O)2 (HL4) have been prepared via
the Staudinger reaction. Treatment of the neutral compounds HL1, HL2,
and HL3 with Ln(CH2SiMe3)3(THF)2 (Ln
= Sc, Y, Lu) generated the solvent-free bis(alkyl) complexes L1Ln(CH2Si...
http://www.polymer.cnt//ss/dongmeicui/publicationsshow_11997.html |
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A Lutetium Allyl Complex That Bears a Pyridyl-Functionalized Cyclopentadienyl Ligand: Dural Catalysis on Highly Syndiospecific and cis-1,4-Selective (Co)Polymerizations of Styrene and Butadiene
A novel linked-half-sandwich lutetium–bis(allyl) complex [(C5Me4C5H4N)Lu(η3-C3H5)2] (1) attached by a pyridyl-functionalized cyclopentadienyl ligand was synthesized and fully characterized. Complex 1 in combination with [Ph3C][B(C6F5)4] exhibited unprecedented dual catalysis with outstanding activities in highly syndiotactic (rrrr>99?%) styrene polymerization and distinguished&nbs...
http://www.polymer.cnt//ss/dongmeicui/publicationsshow_11892.html |
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Isoselective 3,4-(co)polymerization of bio-renewable myrcene using NSN-ligated rare-earth metal precursor: an approach to a new elastomer
The polymerization of bio-renewable myrcene (MY), using a cationic beta-diimidosulfonate lutetium catalyst in high activity, afforded an unprecedented isotactic 3,4-polymyrcene (PMY) with a low T-g (-42 degrees C). Based on this result, the random and block copolymerization of myrcene and isoprene (IP) resulted in novel elastomers that comprise the amorphous iso-3,4-PMY and iso-3,4-PIP sequences...
http://www.polymer.cnt//ss/dongmeicui/publicationsshow_11890.html |
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The co-continuous morphology of biocompatible ethylene-vinyl acetate copolymers/poly(epsilon-caprolactone) blend: effect of viscosity ratio and vinyl acetate content
The phase behavior and its linear viscoelastic responses of a biocompatible blend based on ethylene-vinyl acetate copolymers and poly(ε-caprolactone) (EVA/PCL) were studied in this work in terms of blending ratios and annealing. The effects of viscosity ratios and vinyl acetate contents of the EVA on the co-continuous morphology were addressed. The results show that EVA/PCL is a typical immiscibl...
http://www.polymer.cnt//ss/zhangming/publicationsshow_10594.html |
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Morphological control of porous ethylene-vinyl acetate copolymer membrane obtained from a co-continuous ethylene-vinyl acetate copolymer/poly(epsilon-caprolactone) blend
Ethylene-vinyl acetate copolymer (EVA)/poly(ε-caprolactone) (PCL) blend (50/50 w/w) with co-continuous morphology was
prepared via melt mixing for fabricating microporous EVA membrane materials through selective solvent extraction. Shear flow
and quiescent annealing techniques were employed to control co-continuous phase size in the EVA/PCL blend, and the timeand
temperature-dependent relations o...
http://www.polymer.cnt//ss/zhangming/publicationsshow_10548.html |
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Synthesis and properties of single domain sphere-shaped barium hexa-ferrite nano powders via an ultrasonic-assisted co-precipitation route
To synthesize high quality barium hexa-ferrite nano powders, an ultrasonic-assisted co-precipitation method has been used and the influences of the ultrasonic technique on the particle morphologies and magnetic properties of the synthesized barium hexa-ferrite nano powders have been investigated. The results indicated that the introduction of ultrasonic energy into the co-precipitation process pro...
http://www.polymer.cnt//ss/zhangming/publicationsshow_10528.html |
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Crystallization behavior and hydrophobic properties of biodegradable ethyl cellulose-g-poly(3-hydroxybutyrate-co-3-hydroxyvalerate): The influence of the side-chain length and grafting density
The copolymerization of grafting poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) onto ethyl cellulose (EC) was carried out through the homogeneous acylation reaction between EC as a backbone and telechelic OH-terminated PHBV oligomer as side chains in 1,2-dichloroethane by using 1,6-hexamethylene diisocyanate (HDI) as a coupling agent and dibutyltin dilaurate as catalyst. The resulting copol...
http://www.polymer.cnt//ss/yuhouyong/publicationsshow_10488.html |
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(RSC Advances) Two-Dimensional Correlation Infrared Spectroscopy Reveals the Detailed Molecular Movements during the Crystallization of Poly(ethylene-co-vinyl alcohol)
In this paper, the quantitative spectroscopic evidence for the leading role of hydrogen bonds during the cooling crystallization of poly(ethylene-co-vinyl alcohol) (EVOH) was successfully obtained. Furthermore, the detailed molecular movements during the crystallization of EVOH were revealed via two-dimensional correlation infrared spectroscopy. Two cooling crystallization processes were detecte...
http://www.polymer.cnt//ss/zhoutaopoly/publicationsshow_10297.html |
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(Polymer Chemistry) Micro-dynamics mechanism of the phase transition behavior of poly(N-isopropylacrylamide-co-2-hydroxyethyl methacrylate) hydrogel revealed by two-dimensional correlation spectroscopy
In this study, the micro-dynamic mechanism of volume phase transition behavior of poly(N-isopropylacrylamide-co-2-hydroxyethyl methacrylate) (PNIPAM-co-HEMA) hydrogel was investigated by temperature-dependent FTIR spectroscopy in combination with the perturbation correlation moving window (PCMW2D) technique and generalized two-dimensional correlation analysis. In conventional 1D FTIR spectra ana...
http://www.polymer.cnt//ss/zhoutaopoly/publicationsshow_10286.html |
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