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Molecular dynamics simulation has been used to investigate the molecular weight dependence of glass transition temperature for amorphous poly(l-lactide). Amorphous PLLA systems were created using molecular modeling and NPT ensemble MD simulations were carried out using the modified OPLS-AA force field. The fractal dimension of the PLA systems was 1.62. The molecular weight dependence of glass transition...
A series of partial ladder copolymers were synthesized by chemically oxidative polymerization of m-phenylenediamine (MPD) and o-ethoxyaniline (EOA) using inorganic oxidants in inorganic acidic aqueous media. The polymerization yield, intrinsic viscosity, solubility, and thermal property of the copolymers were systematically studied by changing the comonomer ratio, initial polymerization temperature,...
A series of copolymers were synthesized by chemically oxidative polymerization of p-phenylenediamine (PPD) and o-phenetidine (PHT) in acidic aqueous media. The polymerization yield, intrinsic viscosity, and solubility of the copolymers were comprehensively studied by changing the comonomer ratio, polymerization time and temperature, oxidant, monomer/oxidant ratio, and acidic medium. As-prepared fine...
Binary blend membranes of poly(4-vinylpyridine) (PVP) with ethylcellulose (EC) have been prepared by a solution casting technique with chloroform as solvent. The membranes appear macroscopically miscible but microscopically immiscible based on wide-angle X-ray diffraction, differential scanning calorimetry and scanning electron microscope investigations. Permeating feature of five pure gases through...
A series of copolymers was synthesized by oxidative polymerization of 2-pyrimidylamine (MA) and o-anisidine (AS) with five monomer ratios using ammonium persulfate as an oxidant in 1M HCl aqueous solution at room temperature. The yield, intrinsic viscosity, and solubility of the MA/AS copolymers were studied in detail. The copolymers were characterized by 1 H NMR, FT-IR, wide-angle X-ray diffraction,...
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