Samuel J. Huang

Yield strength of low-density polyethylene-polypropylene blends

Polymer waste recycling is becoming a major problem, because huge amounts of synthetic polymers are manufactured every year for many different purposes. Polymer scraps are gathered from the Municipal Solid Waste (MSW). Within those wastes there are several different polyolefins—such as polyethylene, polypropylene, and polystyrene—all incompatible with each other. In order to recycle these polymers, compatibilization of these polyolefins is needed to avoid high sorting costs and unacceptably low market-value products. In this work, the compatibilization of low-density polyethylene with polypropylene is accomplished through the addition of maleated polyethylene and maleated polypropylene. Prediction of the tensile properties of these blends is attempted, using a model based on continuity of phases in a two-components mixture of thermoplastics.

Mesomorphic Behavior of Enamine-Ketone Compounds

Abstract Several compounds containing the six-membered hydrogen bonded enamine-ketone ring have been investigated by differential calorimetry. The results show that the enamine-ketone moiety can be used in the synthesis of new liquid crystalline compounds.

Electric strength of XLPE containing acetophenone and other volatile substances

Measurements have been made of the AC breakdown strength and the impulse breakdown strength of samples of XLPE (cross-linked polyethylene) to which known amounts of acetophenone, cumyl alcohol, alpha methyl styrene, and cumene were added. A Weibull analysis of the breakdown strengths shows that the presence of a small amount (less than 2 wt.%) of these substances has a small effect on the breakdown strength of unaged XLPE. All these substances have about the same effect: they increase the AC breakdown strength but decrease the impulse breakdown strength.<<ETX>>

Dielectric strength of crosslinked polyethylene: the effects of the volatile products of the crosslinking reaction

The breakdown field strength of recessed samples of XLPE (cross-linked polyethylene) containing varying amounts of acetophenone and cumene is shown to decrease with increasing sample thickness. This thickness dependence is more complicated than previously observed. The addition of small amounts of acetophenone to XLPE produces a small increase in the dielectric strength. Small concentrations of cumene have no effect. Results from both AC ramp to failure and impulse breakdown can be fit to Weibull distributions. The characteristic values obtained from ramp to failure measurements depend on the ramp rate as suggested by theory.<<ETX>>

Electrical strength of XLPE cable insulation containing controlled amounts of the volatile products of the crosslinking reaction

Previous reports have shown that the addition of small amounts of acetophenone, cumyl alcohol, alpha methyl styrene, and cumene to devolatilized compression-molded samples of XLPE (cross-linked polyethylene) has a small effect on the breakdown strength of these samples. The AC breakdown strength is increased; the impulse breakdown strength is decreased. The question addressed is whether the results for the extruded XLPE cable insulation will be the same. The results presented suggest that, qualitatively, the results for the two types of XLPE are much the same. Quantitatively, the breakdown strength of the XLPE cable insulation is much less than that of the compression-molded XLPE.<<ETX>>

Mesomorphic Properties of an Homologous Series of Alkyl-Terminated Enamine-Ketone Containing Liquid Crystals

Abstract An homologous series of enamine-ketone compounds has been synthesized and their thermal properties investigated. The bis [3- p-n-alkoxyanilino)-2-butenoyl] benzenes exhibited nematic mesophases when the terminal alkoxy substituents were short and both nematic and smectic mesophases when the terminal alkoxy substituents contained twelve or more carbons. The thermal data indicate that although crystalline order is largely determined by the packing of the hydrocarbon tails, there is a low degree of interaction by the tails in the nematic mesophase.

Dielectric breakdown of xlpe containing actophenone and cumyl alcohol

Eichorns 1972 paper C13 was one of the first to that the presence of acetophenone contributed higher breakdown strength of XLPE compared to LDPE. More recently, Eager et. al. 123 show acetopheone could be used to rehabilitate ag cable insulation. In the past fifteeen or so yea other papers have reported the results of measu made to understand the effect of the presence by-products of the cross linking reaction, acetoF c w l alcohol, alpha methyl styrene and cumene dielectric strenbgth of XLPE. These include a nu apparently conflicting results. The previously papers claim that the presence of these compou benficial, however, the results of Mizukami et. a show that their presence decreases the impulse br strength.