In this paper, adsorption of methane on porous silica glass was investigated to see whether functional groups can affect the adsorption behavior. Adsorption isotherms for pores having widths between 7 and 40Å at 283 and 298 K were investigated using a Monte Carlo simulation (MC) method. The model of porous silica glass proposed in this study was assumed to be a finite-length slit pore which consisted of two parallel walls. The tetrahedral structure of SiO4 was used as atomic structure for the wall surface. Hydroxyl was assumed as the surface functional group which allocated either at pore mouth or random with concentration of 5 and 10%. It was found that the concentration of functional group has less significant effect on the adsorption of methane. The adsorption isotherm decreased a bit with an increase of functional group concentration. Effects of functional group position on adsorption isotherm were also investigated, the adsorption isotherm obtained for the random topology was greater than that for the pore mouth topology, due to the pore blocking effects. At the same pore width, the adsorption isotherm at 283K was greater than that at 293K, and this was due to that the adsorption of methane on porous silica glass was a physical adsorption. The initial adsorption of methane shifted to the higher pressure by increasing pore width, and the maximum adsorption capacity decreased with an increase of pore size, because of the pore packing effect.
In this study, the influences of processing conditions, that is, injection speed and holding pressure, on the gradient crystal structural formation in the injection‐molded cap specimens were investigated. Skin‐, shear‐ and core‐layers across the specimen thickness were investigated in detail by using small‐angle x‐ray scattering, wide‐angle x‐ray diffraction, and atomic force microscopy techniques. The results showed that high holding pressure caused high density and large weight of the cap specimens. This strongly contributed to high displacement resistant on applied pressure (doming resistant), while the lamellar thickness (Lc) of the skin layer also played a role. On the contrary, low holding pressure promoted the formation of the random‐oriented lamellae in the core layer, which contributed to high environmental cracking resistance (ESCR). Moreover, the lower injection speed caused the thicker Lc of the skin layer, and this improved the ESCR of the specimen. The results allowed us to propose its failure mechanism.
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