STUDIES ON SURFACE CHARACTERIZATION AND ECOMATERIAL SHEET DEGRADATION OF BASALT FIBERS BY PLASMA TREATMENTS AND WOOD FIBERS

1.INTRODUCTIONDue to the fact that it is difficult to recover for many composites, developing naturally degradable ecocomposites has received increasing attention among scientists [1-4]. Basalt fibers serves as a reinforcement for a wide range of applications such as heat-insulation, resistance combustion, soundproofing. Their advantages include no carcinogenic effect, environmentally friendly, flexible, good temperature resistance and heating insulation property[5-8]. They were regarded …     

ON THE CALCULATION OF MESOPORE SIZE DISTRIBUTION BY THE GAS ADSORPTION METHOD

Seeing that some commercial gas adsorption instrument still uses a too rough method for cal-culation of mesopore size distribution, we reviewed some practical methods of calculation so farproposed in the literature. We have found that most of these methods and many books have someincorrectness in the geometric factor Q_i used for the calculation of pore volume △V_i from corevolume △V_i~k. It has been proved that the correct expression for Q_i should be[_i/(_i~k+1/2△t_i)]~2for cylindrical pores, _i,/(_i~k+1/2△t_i)for slit-shaped pores. On the basis of this correct Q_i,these methods were applied to the desorption isotherms. The results were compared and analyzed.     

INVESTIGATION OF ADSORPTION AND ORIENTATION OF PYRIDINE DERIVATIVES ON IRON BY SERS SPECTROSCOPY

Surface enhanced Raman scattering (SERS) spectra of pyridine derivatives adsorbed on iron in 0.1mol/L solution at pH=3.4 were measured using an activated silver electrode covered with an appropriate amount of electrode posited iron. Since bands at 220cm-1,250cm-1 and 240cm-1 in the SERS spectra of pyridine derivatives on iron were, assigned to Fe-N bond, it was concluded, that the derivatives molecules were chemisorbed on the iron surface by the formation of iron-nitrogen coordinated bond inhibiting the corrosion of iron metal.     

PRELIMINARY STUDIES ON STRUCTURES AND PROPERTIES OF WATER-RETENTIVE, FLAME-RETARDANT ACRYLIC FIBERS

The blend fibers of acrylonitrile-vinylidene chloride-sodium methallysulfonate copolymer(AN-VDC-SMAS) and cellulose acetate (CA) with various blend ratios were investigated bymeans of SEM, DDV, WAXD, etc. The results show that AN-VDC-SMAS and CA areincompatibale; the numerous microvoids in the blend fiber resulted from the phase seperationcan remarkably improve the water absorbability and the dyeing behavior but hardly influencethe mechanical properties. On the other hand, the crystal structure of the continuous phaseAN-VDC-SMAS is not influnced by the dispersed phase CA.