Solid polymer electrolytes (SPEs) of polyacrylamide-co-acrylic acid (PAA) as the polymer host and zinc acetate (ZnA) as an ionic dopant were prepared using a single solvent by the solution casting technique. The amorp...Solid polymer electrolytes (SPEs) of polyacrylamide-co-acrylic acid (PAA) as the polymer host and zinc acetate (ZnA) as an ionic dopant were prepared using a single solvent by the solution casting technique. The amorphous and crystalline structures of film were investigated by X-ray diffraction (XRD). The surface morphology of samples was examined by scanning electron microscopy (SEM). The composition and complex formation of films were characterized by Fourier transform infrared (FTIR) spectroscopy. The conductivity of the PAA-ZnA films was determined by electrochemical impedance spectroscopy. According to the XRD and FTIR analyses, all electrolyte films were in amorphous state and the existence of interaction between Zn2+ cations and the PAA structure confirms that the film was successfully prepared. The SEM observations reveal that the electrolyte films appeared to be rough and flat with irregularly shaped surfaces. The highest ionic conductivity (σ) of 1.82 × 10-5 Scm-1 was achieved at room temperature (303 K) for the sample containing 10 wt % ZnA.展开更多
A new copolymer has been synthesized by the copolymerization of acrylic acid with crotonaldehyde in water using K 2S 2O 8 as initiator.The copolymer was characterized by DSC,IR and 13C-NMR.The effects of pH on the rat...A new copolymer has been synthesized by the copolymerization of acrylic acid with crotonaldehyde in water using K 2S 2O 8 as initiator.The copolymer was characterized by DSC,IR and 13C-NMR.The effects of pH on the rate and conversion of copolymerization and copolymer’s composition have been investigated.The results show that,as pH increases,the rate and conversion decrease,especially at pH 5～7,while the content of crotonaldehyde in copolymer increases.It has been proved by IR that there is hydrogen bond between acrylic acid and crotonaldehyde at low pH.The study indicates that hydrogen bond improves the ability of polymerization.However,at high pH,acrylic acid was found as electron acceptor; crotonaldehyde as electron donor.A model of “charge transfer polymerization” was employed to illustrate the copolymerization at high pH.展开更多
文摘Solid polymer electrolytes (SPEs) of polyacrylamide-co-acrylic acid (PAA) as the polymer host and zinc acetate (ZnA) as an ionic dopant were prepared using a single solvent by the solution casting technique. The amorphous and crystalline structures of film were investigated by X-ray diffraction (XRD). The surface morphology of samples was examined by scanning electron microscopy (SEM). The composition and complex formation of films were characterized by Fourier transform infrared (FTIR) spectroscopy. The conductivity of the PAA-ZnA films was determined by electrochemical impedance spectroscopy. According to the XRD and FTIR analyses, all electrolyte films were in amorphous state and the existence of interaction between Zn2+ cations and the PAA structure confirms that the film was successfully prepared. The SEM observations reveal that the electrolyte films appeared to be rough and flat with irregularly shaped surfaces. The highest ionic conductivity (σ) of 1.82 × 10-5 Scm-1 was achieved at room temperature (303 K) for the sample containing 10 wt % ZnA.
文摘A new copolymer has been synthesized by the copolymerization of acrylic acid with crotonaldehyde in water using K 2S 2O 8 as initiator.The copolymer was characterized by DSC,IR and 13C-NMR.The effects of pH on the rate and conversion of copolymerization and copolymer’s composition have been investigated.The results show that,as pH increases,the rate and conversion decrease,especially at pH 5～7,while the content of crotonaldehyde in copolymer increases.It has been proved by IR that there is hydrogen bond between acrylic acid and crotonaldehyde at low pH.The study indicates that hydrogen bond improves the ability of polymerization.However,at high pH,acrylic acid was found as electron acceptor; crotonaldehyde as electron donor.A model of “charge transfer polymerization” was employed to illustrate the copolymerization at high pH.
