P xylylenediamine

Lead(II) iodide (PbI₂, 99%), methylammonium iodide (MAI,
⩾99%), N,N-dimethylformamide
(DMF, 99.8%), dimethyl
sulfoxide (DMSO, ⩾99.9%), p-xylylenediamine
(PDMA, 99%), hydroiodic acid 57% (HI, for synthesis), and diethyl
ether (⩾99.9%) were purchased from Sigma-Aldrich. Propylamine
(PA, ⩾99.0%) were purchased from Fluka. The above-mentioned
were used as received without further purification. Methylammonium
chloride (MACl, for synthesis) was purchased from Sigma-Aldrich, and
was further dried in vacuum oven before use.

Commercially available Torlon® 4000T-LV and Matrimid®5218 were purchased from Solvay Advanced Polymers (Alpharetta, GA) and Huntsman, respectively. SBAD-1, DUCKY-9, and DUCKY-10 polymers were synthesized from literature procedures detailed in two previous publications^{4 ,5 (link)}. Two real crude oils (Permian and Arabian light crude oils) were provided from ExxonMobil Technology and Engineering Company. The experimental results of the two fractionations were published previously^{4 ,5 (link)}. All other chemicals (p-xylylene diamine, lithium nitrate, chloroform, tetrahydrofuran, 1-methylpyrroldone, ethanol, methanol, hexane, toluene, toluene, Tert-butyl benzene, 1,3,5-triisopropyl benzene, n-Octane, iso-Octane, iso-cetane, methylcyclohexane, decalin, 1-methylnaphthalene, o-xylene, propyl benzene, mesitylene, n-butylcyclohexane, tetralin, bi-phenyl, dodecylbenzene, 1,3,5-triphenylbenzene, 1,3,5-Tris[(3-methylphenyl) phenylamino]benzene), methanol, and guaiacol were purchased from Sigma Aldrich, Alfa Aesar, or TCI and used as received.