• 한국자동차공학회논문집
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• 제7권7호
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• pp.268-277
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• 1999

In order to make an advanced dry-friction engineering material, wax-impregnated nylons were synthesized by anionic polymerization of $\varepsilon$-caprolactam in the presence of apraffin wax. DNX-125S, which has lowest melting point among four different kinds of waxs investigated, showed excellent miscibiility with $\varepsilon$-carprolactam and no effect on the polymerization reaction. Five different kinds of wax-impregnated nylons from of DNW-125S content 0% to 8% were synthesized and tested. Among the samples, wax-free nylon has the highest yield and tensile strength and hardness, while the specimen with2% wax has the largest elongationi and energy absorption to break. The wax-impregnated nylon with a wax content 6% showdd the smallest friction coefficient under slow sliding speed and low load. Bus as the sliding speeds were increased to high, thespcieimen with 8% wax has better friction property.

• 한국자동차공학회논문집
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• 제10권6호
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• pp.142-149
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• 2002

The frictional properties of nylon can be improved by the impregnation of lubricants like wax, oil or graphite. The inclusion of these lubricants, on the other hand, decreases the mechanical properties of nylon, such as tensile strength, hardness and impact strength. As an attempt to maximize frictional properties, while minimizing a decrease in the mechanical properties, various kinds of nylon containing 3 wt% wax and varying contents of oil or graphite were prepared. It was found that the synergy effects to improve both friction and anti-wear properties is evidenced by impregnating a combination of wax/oil or wax/graphite. The wear rate of a nylon containing 3 wt% of wax and 1.5 wt% of oil turned out to be 1/4 of that of nylon impregnated with 8 wt% wax or 8 wt% oil. The latter showed the lowest wear rate among the nylons prepared with a single lubricant. In addition, the friction coefficient of the developed nylon was found to be very similar to the nylon with 8 wt% wax only.

• 한국결정성장학회지
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• 제13권1호
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• pp.41-45
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• 2003

FT-IR은 보석을 감별하고 연구하는데 있어서 아주 유용한 장비이다. 그러므로 본 연구에서는 FT-IR을 이용하여 자수정. 황수정, 백수정 그리고 비취를 감별하는 데에 중점을 두었다 FT-IR은 자수정, 황수정과 백수정의 천연과 합성의 진위를 가리는데 매우 효과적이었으며, 천연 비취(A-Jade)와 왁스가 주입된 비취, 폴리머가 주입된 비취(B-Jade)를 식별하는 데 매우 유용하였다. 이러한 기술은 처리와 합성에 의해 새롭게 변화되어 나타나는 보석의 감별에 있어, 결정적으로 도움이 될 것이다.