Fagang Wang

Structure and Performance of Poly(vinyl alcohol)/Poly(γ-benzyl L-glutamate) Blend Membranes

Poly(vinyl alcohol) (PVA)/poly(γ-benzyl L-glutamate) (PBLG) blend membranes with different PBLG wt contents were prepared by pervaporation. Structure and surface morphologies of PVA/PBLG blend membranes were investigated by Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). Thermal, mechanical, and chemical properties of PVA/PBLG blend membrane were studied by differential scanning calorimeter (DSC), tensile strength tests, and other physical methods. It was revealed that the introduction of PBLG homopolymer into PVA could exert an outstanding effect on the properties of PVA membrane.

Properties Study of Poly(L-lactic acid)/Polyurethane-Blend Film

Poly(L-lactic acid) (PLLA)/polyurethane (PU)-blend films were prepared by casting the polymer blend solution in chloroform. Surface morphologies of the PLLA/PU-blend films were investigated by scanning electron microscopy (SEM). Thermal, mechanical, and chemical properties of PLLA/PU-blend films were studied by differential scanning calorimetry (DSC), tensile tests, and contact angle testing. It was indicated that the addition of PU could exert marked effects on the properties of PLLA films.

Properties of Polypeptide-Based Membrane Improved by Flexible Poly(ethylene glycol)

Poly(γ-benzyl L-glutamate)/poly(ethylene glycol) (PBLG/PEG) polymer blend membranes were prepared by casting the polymer blend solution in chloroform. Surface morphologies of the polymer blend membranes were investigated by atomic force microscopy (AFM) and scanning electron microscopy (SEM). Thermal and mechanical properties of the polymer blend membranes were researched using differential scanning calorimeter (DSC) and tensile tests. It was revealed that the introduction of PEG could exert outstanding effects on the morphology and the properties of the polymer blend membranes.

Thermal, Mechanical and Chemical Properties of Hydrophilic Poly(vinyl alcohol) Film Improved by Hydrophobic Poly(propylene glycol)

A series of poly(vinyl alcohol)/poly(propylene glycol) (PVA/PPG) blend films with different PPG contents were prepared by casting the polymer blend solutions. Structure and morphologies of the PVA/PPG blend films were studied by Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). Thermal, mechanical, and chemical properties of PVA/PPG blend films were investigated by differential scanning calorimeter (DSC), thermogravimetric analysis (TGA), tensile strength tests, and other physical methods. It was revealed that the introduction of PPG could exert marked effects on the morphology and the properties of PVA film.

Modification of poly(vinyl alcohol) membrane via blending with poly(γ-benzyl l-glutamate)-block-poly(ethylene glycol) copolymer

A series of poly(vinyl alcohol) (PVA)/poly(γ-benzyl l-glutamate)-block-poly(ethylene glycol) (PBLG-b-PEG) blend membranes with different PVA/PBLG-b-PEG mole ratios were prepared by pervaporation. Structure and morphologies of PVA/PBLG-b-PEG blend membranes were investigated using Fourier transformation infrared spectroscopy (FTIR), and atomic force microscopy (AFM). Mechanical and chemical properties of PVA/PBLG-b-PEG blend membrane were studied by tensile testing and other physical methods. It was revealed that the introduction of PBLG-b-PEG copolymer has significant effect on the properties of a PVA membrane.

Poly(vinyl alcohol) Membrane Modified by Polyurethane

A series of poly(vinyl alcohol) (PVA)/polyurethane (PU) blend membranes were prepared by casting the polymer blend solution in dimethyl sulfoxide (DMSO). Structure and morphologies of PVA/PU blend membranes were investigated by atomic force microscopy (AFM) and scanning electron microscopy (SEM). Thermal, mechanical, and chemical properties of PVA/PU blend membrane were studied by differential scanning calorimetry (DSC), tensile tests, and surface contact angle tests. It was found that the introduction of PU could exert marked effects on the morphology and the properties of PVA membrane.

Factors influencing aggregation behavior of poly( γ -benzyl l -glutamate)- graft -poly(ethylene glycol) copolymer in mixed solvents

Poly(γ-benzyl l-glutamate)-graft-poly(ethylene glycol) (PBLG-graft-PEG) copolymer was synthesized by the ester exchange reaction of PBLG homopolymer with mPEG. Aggregation behavior of the PBLG-graft-PEG copolymer in mixtures of ethanol and chloroform was investigated by transmission electron microscopy (TEM), dynamic light scattering (DLS), and viscometry. Effects of the polymer solution concentration, grafting degree, test temperature, and chloroform content on the morphology, average particle diameter, and critical micelle concentration (CMC) of the micelles formed by the PBLG-graft-PEG copolymer in the mixed solvents were mainly studied. It was revealed that the PBLG-graft-PEG copolymer can self-assemble into polymeric micelles with a core-shell structure in various shapes depending on the preparation conditions.

Morphology and properties of hydrophobic polypeptide-based film improved by hydrophilic poly(vinyl alcohol)

Poly(γ-benzyl l-glutamate)/poly(vinyl alcohol) (PVA) blend films were prepared by a solution casting method. Surface morphologies of the polymer blend films were investigated by atomic force microscopy and scanning electron microscopy. Thermal, mechanical, and physical properties of the polymer blend films were studied by differential scanning calorimetry, tensile tests, and contact angle tests. It was revealed that the introduction of PVA could exert pronounced effects on the morphologies and the properties of the polypeptide films.

Properties of poly(γ-benzyl L-glutamate) membrane modified by polyurethane containing carboxyl group

A series of poly(γ-benzyl l-glutamate) (PBLG)/polyurethane (PU) containing carboxyl group blend membranes was prepared by casting the polymer blend solution in dimethylformamide (DMF). The surface morphology of the PBLG/PU blend membranes was investigated by atomic force microscopy (AFM) and scanning electron microscopy (SEM). Thermal, mechanical, and chemical properties of PBLG/PU blend membranes were studied by differential scanning calorimetry (DSC), tensile tests and other physical methods. It was revealed that the introduction of PU could exert outstanding effects on the morphology and the properties of PBLG membrane.

Surface Morphology and Properties of Rigid Poly(γ-benzyl L-glutamate) Membrane Modified by Flexible Poly(Vinyl Chloride)

Rigid poly(γ-benzyl L-glutamate)/flexible poly(vinyl chloride) (PBLG/PVC) blend membranes were prepared by casting the polymer blend solution in dichloroethane. Structure and morphologies of the PBLG/PVC blend membranes were investigated by Fourier transform infrared spectroscopy (FT-IR), atomic force microscopy (AFM), and scanning electron microscopy (SEM). Thermal, mechanical, and chemical properties of PBLG/PVC blend membranes were studied by differential scanning calorimetry (DSC), tensile tests, and other physical methods. It was found that the introduction of PVC could exert marked effects on the morphology and the properties of PBLG membrane.