A number df phosphorus-containing esters were made from 2,2-dimethyl-l,3-propanediol. Phosphoryl chloride gave a cyclic phosphorochloridate which could be treated with an alcohol or phenol to produce a neutral ester. Phosphonic dichlorides gave cyclic neutral esters directly. When phosphorus trichloride was used, a cyclic bisphosphite was produced; howcver, when this reaction was carried out in the presence of an alcohol, a cyclic hydrogen phosphite was formed. Treatment of 2,2-dimethyl-1,3-propanediol with diethyl phosphorochloridate gave a neutral bisphosphate which on pyrolysis liberated triethyl phosphate to yield a cyclic neutral ester. In general, these derivatives of 2,2-dimethyl-l13-propanediol are stable, white, crystalline compounds.This investigation was undertaken to study the preparation and properties of phosphorus-containing esters derived from 2,2-dimethyl-l,3-propanediol, a derivative of isobutyraldehyde. These esters glycol with a phosphorus dihalide or trihalide usually result,s in the formation of cyclic esters.'-la (1) A.

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synopsisIt is well known that the rheological behavior of polyethylene melts is affected by at least four variables: ( 1 ) molecular weight, (9) molecular weight distribution, (3) long-chain branching and its dietribution, and (4) short-chain branching. Of these, the first three appear to have the largest effects. I n the present paper an attempt is made to determine the effect of molecular weight distribution by rheological studies of polymers having similar molecular weights and degrees of branching, but varying considerably in their molecular weight distributions as determined by fractionation. The rheological parsmeters studied were melt recovery, non-Newtonian behavior, critical shear rate, and melt strength. It is shown that the melt recovery increases uniformly as the molecular weight distribution broadens. The degree of non-Newtonian behavior, as measured by the exponent n of the power law, also increases with distribution breadth and is particularly affected by the amount of low molecular weight polymer present.Critical shear rate is inversely related to the breadth of the molecular weight distribution and is particularly dependent on the molecular weight of the highest fractions. The log of the critical shear rate is inversely proportional to the melt index recovery.Melt strength increases in a similar manner.

6,5 oder weniger war. Oberhalb eines p H s von 6,5 war die ViskosiGt der Polymerisationsgeschwindigkeit umgekehrt proportional. Diese Resultate und die Daten, die von Polymerisationsgeschwindigkeiten und Polymerviskosittiten ah Funktion der Katalysatorkonzentration bei verschiedenen pH-Werten erhalten wurden, zeigen, dass die Viskwitat des gebildeten Polymers hauptsachlich eine Funktion der Bisulfit-Ion-Konzentration ist.