TY - JOUR
T1 - Solubilities and diffusion coefficients of carbon dioxide and nitrogen in polypropylene, high-density polyethylene, and polystyrene under high pressures and temperatures
AU - Sato, Yoshiyuki
AU - Fujiwara, Koji
AU - Takikawa, Tadao
AU - Sumarno,
AU - Takishima, Shigeki
AU - Masuoka, Hirokatsu
N1 - Funding Information:
The present work was supported through the Grant-in-Aid for Scientific Research (A) (Project No. 09305053) by the Ministry of Education, Science, Sports and Culture, Japan and through the `Research for the Future' program (Project No. JSPS-PFTF 96P00401) by the Japan Society for the Promotion of Science.
PY - 1999/8
Y1 - 1999/8
N2 - Solubilities of carbon dioxide and nitrogen in molten polypropylene (PP) and high-density polyethylene (HDPE) were measured at temperature 433.2, 453.2, and 473.2 K and pressures up to 17 MPa. The solubilities increased almost linearly with pressure. While the solubilities of carbon dioxide decreased with increasing temperature, those of nitrogen increased in the temperature range examined. The solubility of nitrogen in glassy polystyrene (PS) was measured at 313.2, 333.2, and 353.2 K and pressures up to 17 MPa. Temperature dependence on the solubility in this system was distinctive, where minimal solubility of 310 cm3(STP)/(kg MPa) was observed around 350 K, by taking into account of our previous data above 373.2 K. Henry's constants, K(p), and their temperature dependence were determined from the experimental data. A linear relationship between 1n(1/K(p)) and (T(c)/T)2 was obtained for each system. Diffusion coefficients of gases in molten polymers were determined for the nitrogen + PP, nitrogen + HDPE, and carbon dioxide + HDPE systems at 453.2 K. The diffusion coefficients showed weak concentration dependence and had an order of magnitude of 10-9 m2/s.
AB - Solubilities of carbon dioxide and nitrogen in molten polypropylene (PP) and high-density polyethylene (HDPE) were measured at temperature 433.2, 453.2, and 473.2 K and pressures up to 17 MPa. The solubilities increased almost linearly with pressure. While the solubilities of carbon dioxide decreased with increasing temperature, those of nitrogen increased in the temperature range examined. The solubility of nitrogen in glassy polystyrene (PS) was measured at 313.2, 333.2, and 353.2 K and pressures up to 17 MPa. Temperature dependence on the solubility in this system was distinctive, where minimal solubility of 310 cm3(STP)/(kg MPa) was observed around 350 K, by taking into account of our previous data above 373.2 K. Henry's constants, K(p), and their temperature dependence were determined from the experimental data. A linear relationship between 1n(1/K(p)) and (T(c)/T)2 was obtained for each system. Diffusion coefficients of gases in molten polymers were determined for the nitrogen + PP, nitrogen + HDPE, and carbon dioxide + HDPE systems at 453.2 K. The diffusion coefficients showed weak concentration dependence and had an order of magnitude of 10-9 m2/s.
KW - Data
KW - Diffusion coefficient
KW - Gas
KW - Henry's constant
KW - Polymer
KW - Solubility
UR - http://www.scopus.com/inward/record.url?scp=0033178139&partnerID=8YFLogxK
U2 - 10.1016/S0378-3812(99)00217-4
DO - 10.1016/S0378-3812(99)00217-4
M3 - Article
AN - SCOPUS:0033178139
SN - 0378-3812
VL - 162
SP - 261
EP - 276
JO - Fluid Phase Equilibria
JF - Fluid Phase Equilibria
IS - 1-2
ER -