Liquid paraffin

About: Liquid paraffin is a research topic. Over the lifetime, 6185 publications have been published within this topic receiving 52956 citations.

High‐density polyethylene (HDPE) hollow fiber membrane via thermally induced phase separation. I. Phase separation behaviors of HDPE–liquid paraffin (LP) blends and its influence on the morphology of the membrane

Abstract: Phase separation behaviors of the blends that consist of high-density polyethylene (HDPE) and LP was investigated by means of thermal analysis. The miscibility of the two components was evaluated in terms of the Flory–Huggins interaction parameter, determined from the Hoffman–Weeks plot, gave a value of 0.36. This leads us to a conclusion that this blend system is applicable to the preparation of microporous hollow fiber membrane by melt spinning of the blend. The homogeneous blends in the molten state become heterogeneous systems to yield microporous HDPE membranes in the course of cooling due to thermally induced phase separation. The influence of the phase separation on the membrane morphology was also discussed. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 73: 2135–2142, 1999

Effect of organic additives on electrical breakdown in transformer oil and liquid paraffin

Abstract: The results of electric-breakdown tests with direct voltage on transformer oil containing additives known as hydrogen acceptors are given in the paper. The test samples were filtered and carefully degassed in a closed test apparatus with an incorporated test cell. The samples were also stress-conditioned for not less than 2h, using direct voltage. The oil and its solutions treated in this way were then tested with uniform and nonuniform electrode configurations.With the electric strength of the treated oil as a reference, the effect on its value of different additives at different concentrations was examined. It was found that the presence of all the additives which were used affected the breakdown strength of the oil. Optimum concentrations of additives were observed, which gave maximum increases in breakdown values.The paper also gives the results of electric-breakdown tests on liquid paraffin and its solutions, containing aromatic constituents of transformer oil as well as hydrogen acceptors. The test samples of liquid paraffin were treated in a similar way to those of transformer oil and tested in the same apparatus. Again using the electric strength of pure liquid paraffin as a reference, the effects of additives were examined. The hydrogen acceptors, when present in liquid paraffin, were found to be less effective than in transformer oil. More pronounced effects of these additives were found, however, when the solution of liquid paraffin also contained a small amount of aromatic constituents of transformer oil.A breakdown model is suggested for both liquids, based on the assumption of two types of gas bubbles which are formed when the liquids are subjected to high electric stresses. This model gives a reasonable explanation of the experimental observations.