Phase behavior of poly(ethylene-co-norbornene) in C6 hydrocarbon solvents: Effect of polymer concentration and solvent structure

Abstract

Phase behavior information is necessary for accomplishing homogeneous copolymerization to obtain high yield of copolymers and prevent a fouling problem. Cloud-point data to 160 o C and 1,450 bar are presented for five C 6 hydrocarbon solvents, normal hexane, 2,2-dimethyl butane, 2,3-dimethyl butane, 2-methyl pentane, and 3-methyl pentane, with poly(ethylene-co-53 mol% norbornene) (PEN 53 ). The pressure-concentration isotherms measured for PEN 53 /n-hexane have maximums that range between 5 and 12 wt% PEN 53 . The cloud-point curves for PEN 53 all have negative slopes that decrease in pressure with temperatures. The single-phase region of PEN 53 in n-hexane is larger than the regions in 2,2-dimethyl butane, 2,3-dimethyl butane, 2-methyl pentane, and 3-methyl pentane. The cloud-point curve of PEN 53 in 2,2-dimethyl butane is located at higher temperatures and pressures than the curve in 2,3-dimethyl butane due to the reduced dispersion interactions with and limited access of 2,2-dimethyl butane to the copolymer. Similar cloud-point behavior is observed for PEN 53 in 2-methyl pentane and 3-methyl pentane.

Ambient volatile organic compounds and their effect on ozone production in Wuhan, central China

“…Therefore, factor 4 is assigned to the petrochemical industry. Factor 5 appeared to be associated with solvent usage, with high loadings of C 6 -C 7 alkanes and moderate percentages of trichloroethylene and tetrachloroethylene, which serve as solvents in dry cleaning/degreasing Huang et al, 2014;Kwon and Lee, 2003;Lash and Parker, 2001). The last factor had high loadings of nonane and decane, and moderate percentages of TEX (toluene/ethylbenzene/xylenes).…”