1,1,2,2-Tetrachloroethane phenol

Poly(alkylene terephthalate)s are soluble only in solvents such as 1,1,2,2-tetrachloroethane-phenol or o-cresol-CHCl3 mixtures, o-chlorophenol,... 

It is expected that if trans esterification occurs, the intrinsic viscosity of the samples will decrease and the rates of crystallization and ultimate degrees of crystallinity will also decrease. Therefore a series of studies on the 50/50 blend which was kept in the melt for 2, 3, 5, 7, and 10 minutes were performed. The crystallization was followed by DSC and IR. Simultaneous measurements of the intrinsic viscosity were made on a 40 60 mixture of 1,1,2,2,-tetrachloroethane phenol. The results are plotted in Figures 28, 29, and 30. 

The appropriate monomeric binary salt (1.0 g) was placed in a Pyrex tube, dried under reduced pressure for 1 h prior to reaction and heated in an oil bath under reduced pressure at 150-200 °C for 2h. The product was dissolved in a mixed solvent of 1,1,2,2-tetrachloroethane-phenol (40/60 by weight) or in DMSO, filtered through a glass filter to remove alkali bromides and poured into methanol to initiate precipitation. The resulting precipitate was washed with methanol and dried under reduced pressure. The product was purified by reprecipitation. 

Intrinsic viscosity [tj] of copolymer dissolved in 1,1,2,2-tetrachloroethane/phenol (4/6, w/w) mixture was measured with Ubbelohde viscometer at 35°C and 0.5 g/dl of concentration. 

Amorphous bisphenol-A polyarylates are soluble in dioxane and in chlorinated solvents such as CH2C12, 1,2-dichlororethane, 1,1,2-trichloroethane, and 1,1,2,2-tetrachloroethane while semicrystalline and liquid crystalline wholly aromatic polyesters are only sparingly soluble in solvents such as tetrachloroethane-phenol mixtures or pentafluorophenol, which is often used for inherent viscosity determinations. 

In contrast, polynaphthoylenebenziniidazote based on 2,2-bis(3,4-diaminophenyl) hexafluoropropane are soluble not only in H2SO4, m-cresol and a tetrachloroethane-phenol mixture (3 1) (this is characteristic for polymers derived from bis(o-phenylenediamine) and naphthalene-l,4,5,8-tetracarboxylic acid dianhydride [183, 184]) but also in N-MP (N-methylpyrolidane). An enhanced solubility of polynaphthoyleiKbenzimidazoles of this series is explained not only by the introduction of a hinge group between naphthalic anhydride moieties, but also by low viscosity characteristics of the systems caused by low basicity of 2,2-bis(3,4-diaminophenyl)hexafluoropropane [185],... 

Note The calculated data are given in parentheses + is completely soluble. Temperature of the 5% weight loss. Measured in a tetrachloroethane-.phenol (3 1) mixture. reduced viscosity ... 

Film cast from solutions in a tetrachloroethane phenol (3 1) mixture had a tensile strength of the order of 60-80 N/m and retained up to 50% of their initial strength upon heating to 200 C. 

Good solvent tetrachloroethane/phenol, hexafluorolsopropanol, trlfluoroace-tlc acid/methylene chloride, phenol/tetrachloroethane Chuah, H H Lin-Vien, D Soni, U, Polymer, 42, 7137-39,2001. 

The ionic polymerization of 1,4-epoxycyclohexane to form high melting polycyclohexylene ether was studied. Catalyst concentration, temperature, and catalyst combination affected the rate and degree of polymerization. The best catalyst pairs identified were FeCla-SOCb, FeCb-succinyl chloride, and SbCIs-succinic anhydride. Polymer properties included crystallinity which did not disappear up to 410°C and insolubility in many organic solvents. The polymer was soluble in a tetrachloroethane/phenol mixture. Copolymerizations with tetrahydrofuran and 1,4-epoxycyclohexane were studied in a variety of solvents. 

Poly(methyl-n-decyl itaconate) Chromatography henzene/n-hexane Tetrachloroethane-phenol SEC, p-styragel 2691... 

EHchloroacetic acid, formic acid, trifluac c acid DMF,. s> m-tetrachloroethane/phenol (2/3)... 

The solubility parameter of poly(ethylene terephthalate) is about 21.8 MPa but because it is a highly crystalline material only proton donors that are capable of interaction with the ester groups are effective. A mixture of phenol and tetrachloroethane is often used when measuring molecular weights, which are about 20 000 in the case of commercial polymers. 

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