Waxes weight ratio

Solvent, product aldehyde pressure, 500 psi temperature, 107°C catalyst, 3/1 weight ratio of PPh3 to HRh(CO)(PPh3)3. b Chevron cracked-wax o-olefin. c Gulf a-olefin from ethylene polymerization. 

The procedures and equipment that were employed in this work were identical to those utilized by Pomes and Paul in the preparation of melt-blended nylon 6-montmorillonite nanocomposites described in Chapter 5. As one may anticipate from the studies in Chapters 5 and 6, the more hydrophobic Cloisite 20A was more efficient in producing exfoliated composites. The presence of the EEDPE-g-MA in the polymer blend further encouraged the exfoliation of Cloisite 20A. When the weight ratio of EEDPE-g-MA to Cloisite 20A is increased to 4 and subsequently to 11, the WAXS indicated good exfoliation with a loading of 4.6 and 4.9 wt.%, respectively, of montmorillonite (determined by incineration of the polymer composite in an oven). The TEM for the composite with a ratio of 11 at 4.9% montmorillonite indicated good exfoliation. 

This increase in reinforcement efficiency appears to be consistent with the WAXS and TEM data. The modulus values for the terpolymers and 90 10 weight ratio blends of SAN SMA at 25 wt.% were very similar to the modulus value of SAN as 25% AN content. 

In both solvents, the 6 1 and 3 1 ratios produced polysilazane oils with molecular weights in the range 390-401 g/mol and 480 g/mol, respectively. When a 1 1 reactant ratio was used, waxes of somewhat higher (764-778 g/mol) molecular weights were obtained in both solvents. In the 1 1 reaction carried out in Et2<3 the yield of soluble product was only 40%, but in THF it was nearly quantitative. 

The most common type of wax crystal modifier used to reduce the pour point and filtration temperature of distillate fuel is based on ethylene vinylacetate (EVA) copolymer chemistry. These compounds are quite common throughout the fuel additive industry. The differences, however, are found in the variation in the molecular weight and the acetate ratio of the copolymer. 

In a number of hydro-isomerization experiments paraffin wax (average molecular weight 375) was vaporized with hydrogen and treated with different catalysts (W.H.-S.V. 0.89-1.04, temperature 4io-450°C, hydrogen pressure 32-102 atm., molar ratio hydrogen wax=61 183). The reaction products were distilled at atmospheric pressure... 

Tetrachloroethylene can be copolymerized with ethylene in the ratio 7-14/86-93 mole %. Higher ratios of tetrachloroethylene lead to telomers and mixtures of telomers and copolymers. With increasing chlorine content, the molecular weight decreases from 7860 to 720. The products contain trichlorovinyl and chlorine end groups and vary from liquids to waxes and solids. 

A test was made with 2-methylpentane as the supercritical solvent at 514 K and 4.37 MPa, at a molecular sieve to oil ratio of 5.85 and a solvent to oil ratio of 20.1. The n-paraffin content of the wax distillate was reduced by 77% to a level of 3.8 wt %. In this test, an extraordinary gain in molecular sieve weight occurred. A significant amount of the 2-methylpentane was recovered upon desorption of the molecular sieves with ammonia. 

The ratio is of diagnoslic value if kt kj, essentially low molecular weight products such as methane or Cj —C4 are formeduf ki ki, the reaction will yield oligomers in a wider distribution, e.g., Ci, Cis. and if 2 > the reaction will yield high molecular wei i products like waxes or polymethylene [12]. 

The starting material represents a polyblock PEE comprising PBT as the hard segments and PEO (with a molecular weight of 1000 and polydispersity of 1.3, according to GPC analysis) (Fakirov et al, 1991) as the soft segments in a ratio of 57/43 wt%. The sample was a bristle, drawn at room temperature to five times its initial length, and then annealed with fixed ends for 6 h in vacuum at a temperature of 170 °C. WAXS and microhardness measurements were performed in the same way as for the homo-PBT. 

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