IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Carbon dioxide with Poly(y-methyl-L-glutamate) (PMG)

Components:
   (1) Carbon dioxide; CO2; [124-38-9]  NIST Chemistry WebBook for detail
   (2) Poly(y-methyl-L-glutamate) (PMG); ; [25086-16-2]  NIST Chemistry WebBook for detail

Original Measurements:
   Y. Tsujita, T. Sumitomo, M. Nomura and A. Takizawa, J. Appl. Polym. Sci. 30, 2723 (1985).

Variables:
   Temperature = 298 K - 308 K
   Pressure = 0-40 kPa

Prepared By:
   Yu. P. Yampol'skii

Experimental Remarks:

   Different forms of PMG:PMG cast from chloroform (C), dimethyl-formamide (D), mixture of methylene chloride-dimethylformamide (D-D), and Β).
Sorption=(vol. of gas at STP/cm³)/mol of residue.

Experimental Data:   (Subscripts 1,2,3, ..., in column headings refer to components 1,2,3, ...)

Table 1. Parameters of Langmuir equation p/n = 1/ab + p/b
Affinity Coefficient b [cm³(STP)/mol]	α [(cm Hg)^–1]	Remark(s)
660	0.036	C (sample)
370	0.022	D
480	0.035	D.D
371	0.018	/3

Table 2. Sorption isotherms of carbon dioxide in the different forms of PMG at (a) 298 K and (b) 303 K (The original data were represented graphically)
Sorption [(V₁(STP)/V₂)]	Fugacity [f₁/f⁰₁]	Remark(s)
106.36	12.25	Form C (a)
145.08	21.64	Form C (a)
198.34	38.96	Form C (a)
219.72	46.00	Form C (a)
242.58	54.17	Form C (a)
260.50	63.06	Form C (a)
286.40	70.69	Form C (a)
319.70	84.52	Form C (a)
115.18	22.01	Form D-D (a)
165.03	39.50	Form D-D (a)
210.67	59.01	Form D-D (a)
25.15	7.44	Form D (a)
40.93	11.64	Form D (a)
56.57	21.07	Form D (a)
66.93	29.91	Form D (a)
82.59	38.41	Form D (a)
101.98	48.98	Form D (a)
116.04	61.01	Form D (a)
132.77	72.12	Form D (a)
146.08	83.78	Form D (a)
38.99	13.50	Form Beta (a)
52.73	23.29	Form Beta (a)
60.47	30.99	Form Beta (a)
69.33	39.25	Form Beta (a)
89.04	51.88	Form Beta (a)
102.39	62.23	Form Beta (a)
113.90	70.51	Form Beta (a)
129.05	83.85	Form Beta (a)
138.62	22.53	Form C (b)
191.14	39.48	Form C (b)
244.8	56.05	Form C (b)
265.73	65.70	Form C (b)
283.30	73.47	Form C (b)
312.15	84.10	Form C (b)
100.53	18.18	Form D-D (b)
140.91	36.17	Form D-D (b)
172.97	53.91	Form D-D (b)
217.15	71.55	Form D-D (b)
254.05	92.31	Form D-D (b)
54.33	19.94	Form D (b)
70.33	29.74	Form D (b)
85.58	39.92	Form D (b)
102.26	52.90	Form D (b)
115.19	64.36	Form D (b)

Method/Apparatus/Procedure:
   Method of sorption measurement was described in Ref. 1.

Source and Purity of Materials:
   PMG: Ajimoto Co.; M_w 100 000. Films were cast from CHCl₃ DMFA, mixture of DMFA and CH₂Cl₂. PMG in β-form was cast from CH₂Cl₂, then treated by 80 % water- solution of HCOOH and dried.

Estimated Errors:

   Temperature: No information given.

References:
   ¹H. Kodama, Y. Tsujita, and A. Takizawa, 3. Macromol. Sci. Phys. 17, 57 (1980).