ISSN:
0730-6679
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Polypropylene (PP) compositions containing 0-20 vol % of steel fibers (SF) [neat or with 5 wt % of maleated propylene wax (MPP)] were prepared and tested for electrical and thermal conductivities. It was found that, at room temperature, the volume resistivity Ωv fell below 10 ohm cm at SF loading of about 10 vol %. However, as the test temperature increased to 120°C, higher loadings were required to secure the same resistivity, i.e., 12 and 14 vol % of SF for composites without and with MPP, respectively. By contrast with a sharp decrease of Ωv (by 16 orders of magnitude upon addition of a few percent of SF), the increase of thermal conductivity was much less dramatic. The thermal conductivity k of the composites was found to be proportional to volume loading, increasing by a factor of 1.8 on addition of 20 vol % of SF, independently of temperature and MPP presence. Annealing had a small positive effect on k.
Additional Material:
12 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/adv.1985.060050303
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