Solubility xylene

Some studies relative to the influence of Lewis bases,124-127 1,3-diethers in particular,125-127 and the MgCl2 support have also been recently reported. The dependence of the industrially relevant isotactic indexes on the chemical structure of the 1,3-diether donor has been rationalized in the assumption that donor coordination competes with Ti catalytic species formation and xylene-insoluble (highly isotactic) and xylene-soluble (poorly isotacUc) fractions are mainly obtained by polymerization on (100) and (110) cuts, respectively.127... 

Miscible with acetone, benzene, chloroform, ethanol, ketones, toluene, and xylene. Soluble in carbon disulfide and kerosene (50 g/L) (Windholz et al., 1983 Worthing and Hance, 1991). 

Solubilities of Gc in Various Solvents per 100g, at 25°C completely miscible with w, lower aliphatic ales, aldehydes ketones AcOH, pyridine, chlorobenz, phenol, furfural deny de and glycerol slightly dissolves in CS2. chlf xylene solubilities in other solvents ... 

Xylene-soluble highly grafted artlexldant functions on polyolefin backbone... 

Insoluble in benzene, carbon tetrachloride and xylene. Soluble in solution of alkalies. A saturated solution of salicylamide in water has a pH 5 2-6(l,U,5) ... 

Dissolves in water, forming maleic acid. Very soluble in acetone, ethyl acetate, chloroform, benzene, toluene, and xylene soluble in dioxane slightly soluble in carbon... 

Slightly soluble In acetone, carbon disulphide, diethyl ether, ethanol glacial acetic acid toluene hot xylene soluble in benzene ... 

Table 1. Main Characteristics of the iPPs examined. < )Xylene soluble weight percentage...

The reaction of the black indium powder with the a-bromoacetate can be readily observed by the rapid disappearance of the black powder and the formation of a brownish-yellow material. The proposed structure for the intermediate indium compounds is (EtOCOCH2)2lnBr. This is based on an analysis of the material which was xylene soluble and showed an In/halide ratio of 1.05 1.00. The overall reaction scheme is shown in Equation 6.1. 

The MAH contents of the xylene-soluble and xylene-insoluble fractions were determined by heating a 1-2 g sample in refluxing xylene to dissolve or swell the polymer and then, on conversion of succinic acid to anhydride units, to remove a xylene-water azeotrope in a Dean-Stark tube. The xylene solution or suspension was cooled to about 60 C and 0.5N methanolic KOH was added through the condenser. The mixture was refluxed for 1.5 hrs, cooled and titrated with a 0.25N isopropanolic HCl solution to a phenolphthalein end point. 

Table I Main characteristics of the resin used in the present study elastomer content, resin viscosity in the melt (Melt Flow Index) and viscosity ratio between the xylene soluble and the xylene insoluble fractions.

The resins used to study the influence of EP/PP viscosity ratio were provided by SOLVAY. Samples, PPEP3 and PPEP4, are reactor blends produced in gas-phase by a two-stage polymerization process. They differ by the viscosity ratio between the EP and the PP phases which corresponds to the ratio of the solution intrinsic viscosities of the xylene-soluble fraction (mainly EP) and the xylene-insoluble fraction (mainly crystalline PP). Disks of these resins were injection molded and analyzed by TEM and by AFM and FMM. 

Reaction of the polysilazane derived from dimethyldichlorosilane and ethylenediamine with cupric chloride is thought to form a double-chain or ladder type of polymer (52). Although this has been carried out in two discrete steps, the conditions for each are such that it could probably be effected in one. The initial prepolymer [29] is an oil with a molecular weight of 1940 (ebullioscopy). The xylene-soluble ladder polymer [30] is a waxy material, whereas the xylene-insoluble product is a gel containing copper. 

The silyl HA-CTA with a greater degree of silylation can be dissolved in hexane and xylenes, while those with smaller degrees of silylation are soluble in acetone, tetrahydrofiiran, and 1,2-dichloroethane. The time and temperature conditions used to make the xylenes-soluble materials did not cause appreciable degradation (chain scission) of the HA. Silyl HA-CTA is stable in air, polymer samples left in ambient air for 1 year maintained their chemical structure [80]. 

Atactic PP is soluble in a hydrocarbon solvent such as xylene, but isotactic PP is not. An accepted industrial method for measuring isotacticity is to determine the amount of xylene-soluble fraction in a given PP. Finally, it may be noted that the techno-commercial feasibility of the industrial manufacture of syndiotactic PP depends on finding unique applications of such a polymer. 

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