{"compilation": {"title": "Solubility data from IUPAC SDS Volume 70 (page 1409) - Methane with Copoly(pyromellitic dianhydride-isopropylidine dianiline) PMDA-IPDA", "publisher": "The International Union of Pure and Applied Chemistry", "keywords": "Solubility, Solubility data series", "compilers": "Yuri P. Yampol'skii", "sources": [{"citation": "O'Brien, K. C.; Koros, W. J.; Husk, G. R.; J. Membr. Sci. 35, 217 (1988).", "pubtype": "paper", "url": "https://doi.org/10.1016/s0376-7388(00)82445-x"}], "system": "Methane with Copoly(pyromellitic dianhydride-isopropylidine dianiline) PMDA-IPDA", "substances": [{"constituent": 2, "name": "Copoly(pyromellitic dianhydride-isopropylidine dianiline) PMDA-IPDA", "formula": null, "molweight": 0.0, "casrn": "poly-006", "sample": "PMDA-IPDA: polymerization performed in dimethylacetamide as $\\pu{288-293 K}$ to form polyamic acid precursor according to standard procedure [2]. The polyamic acid solution was wet cast on a glass substrate heated for one hour at $\\pu{353 K}$ under $\\ce{Ar}$ to remove the solvent and then imidized by a two-step cure under vacuum (24 hr at $\\pu{483 K}$ and four hours at $\\pu{553 K}$). $T_{\\rm{g}}$ was not reached even though the polymer was heated to $\\pu{750 K}$. $\\rho = \\pu{1.285 g mL-1}$."}, {"constituent": 1, "name": "Methane", "formula": "CH4", "molweight": 16.0425, "casrn": "74-82-8", "inchi": "InChI=1S/CH4/h1H4", "inchikey": "VNWKTOKETHGBQD-UHFFFAOYSA-N", "sample": "Matheson Gas precision mixture $\\pu{50 \\pm 0.5\\%}$ each $\\ce{CO2}/\\ce{CH4}$."}], "method": "Sorption measurements were carried out using a single transducer apparatus described in [1].", "reference": {"citation": "Sroog, C. E.; Endrey, A. L.; Abravio, S. V.; Berro, C. E.; Edwards, W. M.; Olivier, K. L.; J. Pol. Sci., Part A 3, 1373 (1965).", "pubtype": "paper", "url": "https://doi.org/10.1002/pol.1965.100030410"}, "dataset": [{"series": 1, "points": [{"pntnum": 1, "conditions": [], "data": [{"property": "Ambient pressure", "number": "2.2e-01", "significand": "2.2", "exponent": "-1", "sigfigs": "2", "unit": "$\\pu{MPa}$"}, {"property": "Sorption", "number": "3.86e+00", "significand": "3.86", "exponent": "0", "sigfigs": "3", "unit": "$\\pu{V_{1}/V_{2}}$"}], "supplemental": []}, {"pntnum": 2, "conditions": [], "data": [{"property": "Ambient pressure", "number": "5.9e-01", "significand": "5.9", "exponent": "-1", "sigfigs": "2", "unit": "$\\pu{MPa}$"}, {"property": "Sorption", "number": "9.90e+00", "significand": "9.90", "exponent": "0", "sigfigs": "3", "unit": "$\\pu{V_{1}/V_{2}}$"}], "supplemental": []}, {"pntnum": 3, "conditions": [], "data": [{"property": "Ambient pressure", "number": "1.03e+00", "significand": "1.03", "exponent": "0", "sigfigs": "3", "unit": "$\\pu{MPa}$"}, {"property": "Sorption", "number": "1.346e+01", "significand": "1.346", "exponent": "1", "sigfigs": "4", "unit": "$\\pu{V_{1}/V_{2}}$"}], "supplemental": []}, {"pntnum": 4, "conditions": [], "data": [{"property": "Ambient pressure", "number": "1.50e+00", "significand": "1.50", "exponent": "0", "sigfigs": "3", "unit": "$\\pu{MPa}$"}, {"property": "Sorption", "number": "1.626e+01", "significand": "1.626", "exponent": "1", "sigfigs": "4", "unit": "$\\pu{V_{1}/V_{2}}$"}], "supplemental": []}]}]}}