http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Glass 전이점 이상과 이하에서 polystyrene의 자유 체적의 온도의 영향
류종하 영남이공대학 1982 論文集 Vol.11 No.-
On the assumption that a polymer molecule has constant occupied volume and variable free volume, an equation which describes fractional free volume as a function of temperature is derived as shown belowo; above T_g; f = 1-{exp(-∫_0^(T_g)αGdT-∫_(T_g)^TαLdT)}/1+f_0 below T_g; f = 1-{exp(-∫_0^T-αGdT)}/1+f_0 where αG and αL are thermal expansion coefficient below and above T_g, respectively, and f_0 is fractional free volume at 0˚K. The calculated f from this derived equation shows a good agreement with that calculated from Richardson's empirical equation. For polystyrene the calculated f deviates from that of Richardson's empirical equation with no more than 4.2% deviation limit.
Polystrene내에서 기체 확산에 대한 자유체적의 영향 : CO₂Diffusion into Classy Polystrene
류종하 영남이공대학 1985 論文集 Vol.14 No.-
An analysis of diffusion coefficient, CO₂ diffusion into glassy polystyrene. has been -made. Temperature and pressuse (density of penetrants) dependences of diffusion coefficients are expressed as a function of fractional free volume. From this study it is found that one of the major factors controlling gas diffusion in polymer is the quantity of free volume. The increase of diffusion coefficient as a function of temperature is due to the increase of free volume, and this free volume increase is contributed by temperature increase and penetrant gas. This penetrant gas contribution is known as plasticization of polymer by absorbed gas.
류종하 영남이공대학 산업기술연구소 1988 産業技術硏究 Vol.2 No.-
An equation of state for liquid and glassy polymers is derived. The theoretical values of specific volume, thermal expansivity and isothermal compressibility calculated from the equation agree with experimental ones. It's been found that Rao constant for every polymer is different and the Rao constant of a glassy polymer is larger than that of the liquid polymer.
류종하 영남이공대학 2001 論文集 Vol.30 No.-
A setniempirical expression about isothermal bulk modulus, B_γ, for n-nonane is obtained on the supposition that a cluster made of liquid molecules vibrates like a hard sphere in the free surrounds it and the effect of pressure on the occupied volume of n-nonane is space which negligible. The isothermal equation of state, B_γ=B_0[1+B(T)Pⁿ] is integrated to given an equation of state, <원문참조> where B_0 is bulk modulus, P = 0, B(T) + <원문참조>, B(T, P)=[B_γ/B_0]<원문참조>, K_θ=A'a_(a_0)^⅓ and K₁=A_(s₂)/3. The parameters of the equation of state are determined by fitting this equation to the reported data about specific volume of n-nonane. The isothermal bulk moduli, calculated from above equation and parameters, are compared with reported ones.
류종하 영남이공대학 1998 論文集 Vol.27 No.-
A semiempirical expression about isothermal bulk modulus, BT, for simple organic liquids is obtained on the supposition that a cluster made of liquid molecules vibrates like a hard sphere in the free space which surrounds it and the effects of temperature and pressure on the occupied volume of simple organic liquids are negligible. The isothermal bulk modulus, B_γ - B_0 [ 1 + B₁(T) P + B₂(T) P²], is integrated to give an equation of state, which is given by <원문참조> where B_0 is bulk modulus at P=0, b₁=[B₁(T)+<원문참조>/2, b₂=[B₁(T)-<원문참조>/2, B₁(T) - [2G_γ(0)+5/3]/ B_0, B₂(T) - [Gγ²-(0) - G_γ(0) - 1/9]/B_O², G_γ(0) is isothermal Gru¨neisen parameter at P = 0. The parameters of the equation of state arc determined by fitting this equation to the reported data about specific volume for n-nonane, 3, 3-diethyl pentane, 4, 4-dipropylheptane and 5, 5-dibuylnonane.
류종하 영남이공대학 1982 論文集 Vol.11 No.-
From Andrew's statistical model about fractional free volume following equation is derived, D=A_F·T·exp(-B_N/f - 0.232P) where D, T, f and A_F are diffusion coefficient, temperature, fractional free volume and constant (=2.7145×10^(7)), respectively, and B_(N) is given as a function of pressure, B_(N)=3.358-0.232P. This derived equation reads following results, ⅰ. diffusion coefficients increase as a equation of temperature and pressure (concentration of diffusion particles). ⅱ. factors governing diffusion rate are free volume and pressure. The calculated D from derived equation shows a fairly good agreement with Tokuda's experimental results for the case of CO² diffusion in polystyrene, especially, from this derived equation D can be calculated for temperature range above and below Tg.