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Kaolin 충진제 표면처리에 관한 연구(제2보) : 주조전자현미경에 의한 morphology
홍성일,이용무,허동섭,권동용 한국고무학회 1983 엘라스토머 및 콤포지트 Vol.18 No.4
Scanning electron microscopy studies were conducted to examine the surface treatment effects of treating agents the proposed in the previous studies on various vulcanizates. Fracture surfaces of the vulcanizates compounded with kaolin treated with sodium polyphosphate or poly(maleic anhydride) presented favorable results as expected from the results of the previous studies. Tn other words, treating agents such as sodium polyphosphate and poly(maleic anhydride) show considerable reinforcing effects on the vulcanizates.
홍성일,최효돈 대한설비관리학회 1998 대한설비관리학회지 Vol.3 No.1
The reason why the safety control cost could not warrant the fundamental safety in construction sites are seeking economic advantage of owners and unwillingness of activities and guides on the problem of computing the standard safety control cost. In the context of the special features of present construction works, IE, large scale, high stories and complexity, it is easy to understand that even a small disaster in construction sites can become a serious one that results in huge damages and losses. Thus the purpose of this study is to perform a survey for the standard cost for safety control in the construction works in order to prevent the disasters in the industry and construction works.
홍성일,권동용 한국고무학회 1985 엘라스토머 및 콤포지트 Vol.20 No.1
Elastomer-filler interaction in terms of characterization of filler effects was studied using natural rubber(NR) loaded with kaolin fillers modified with sodium polyphosphate and poly (malefic anhydride), respectively. Kaolins modified with sodium polyphosphate or poly (malefic anhydride) show adhering characteristics by Kraus plot. Reinforcement activity according to Cunneen-Russell method is given by those fillers, in which sodium polyphosphate-treated kaolin presents more favorable results than that treated with poly(maleic anhydride) with respect to adhesion constant, reinforcement extent, elastic constant, and crosslink density, When applied to Blanchard's linkage reinforcement theory, NR vulcanizates loaded with kaolin modified with sodium polyphosphate meet the requirements for both approximate linkage reinforcement (ψ') of 1.02 to 4.94 and accurate linkage reinforcement (ψ) of 1.00 to 1.18, representing the values of effective wetting(Cψ) for 0.001 to 0.029 and intrinsic linkage reinforcement (ψ_0) for 1. 015 to 1. 124, respectively, while negligible linkage reinforcement is shown by NR vulcanizates loaded with kaolin treated with poly(maleic anhydride). Dynamic storage modulus (G') given by surface modified kaolins presents more favorable crosslink density rates of 2.260×10^(-5) mole/㎠-min, for sodium polyphosphate treated kaolin and 1.305×10^(-5) mole/㎠-min, for poly(maleic anhydride) treated kaolin, respectively, compared to untreated kaolin showing the rate of 1.033×10^(-5)mole/㎠-min.