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강용구(Young-gu Kang),권현규(Hyunkyu Kweon),최성대(Seong-Dae Choi),노인규(In-Gyu Noh) 한국기계가공학회 2009 한국기계가공학회지 Vol.8 No.4
In this paper, polymer nanocomposites were fabricated by mixing fire-resistant and high pseudoplastic Nylon 6,6 with MWNT(Multiwalled Nanotube), which has mechanical, electrical, and heat stable properties. The experiments were performed in order to investigate their mechanical and electrical properties depending on the level of MWNT and the presence of acid treatment on Nylon 6.6. Morphology of polymer nanocomposites was observed using Scanning Electron Microscopy technique. The results indicate that the polymer nanocomposites have the best mechanical and electrical properties in the optimal conditions of Nylon 6.6 and MWNT(10wt%).
배합중 카본블랙 혼입속도에 천연고무 점도가 미치는 영향
강용구(Yong-Gu Kang),한신(Shin Han),이계정(Kye-Jung Lee),류동완(Dong-Wan Ryu),박찬영(Chan-Young Park) 한국산업융합학회 1999 한국산업융합학회 논문집 Vol.2 No.1
The power curve during rubber mixing presents useful information for the understanding of rubber mixing process, because the power curve is determined the mixing state of rubber at the point. The time to the second peak on the power curve js known as carbon black incorporation time, BIT. This study gets the quantity relationship of BIT and viscosity of natural rubber, so by determining the mixing time of the compound on the ground of viscosity of the raw rubber. The mixing with natural rubber and carbon black is examined for various grade natural rubbers, encompassing a wide range of Mooney viscosity. Alter smoothing the mixing power curve using a polynomial, the carbon black incorporation time, BIT, was determined time to second power peak on the curve, The BIT's versus specific values on Mooney viscometer test curve show a linear relation, Especially, the peak of initial maximum torque on Mooney viscometer curve, PMT, is most relevant property relating to the BIT. PMT is useful index for determined optimum mixing time, To apply this results at the mixing, we effectively control the natural rubber mixing but can also know the grading of natural rubber upon processability.<br/>
한신(Shin Han),강용구(Bong-Young Sohn),손봉영(Yong-Gu Kang),오세철(Sei-Chul Oh),박찬영(Chan-Young Park) 한국산업융합학회 1999 한국산업융합학회 논문집 Vol.2 No.1
Intending to develop a new rubber curing process using only microwave, the both the characteristics of cure and the mechanical properties of rubbers for the tire tread, for which a green styrene-butadiene compounds had been cured with 2.45 GHz microwave, have been compared with those of the custom thermal cured rubber. The unintentional hot spot formation in the compound during the microwave curing has not found where the compound has a microwave absorbing ceramic powders in 4.18 weight percents and the supplying voltage has been adjusted to 90 volts. The new microwave process accomplished preheating to 418K in a quarter of the thermal cure time. The average tensile strength of the microwave-cured rubber indicating 190㎏/㎤ was compatible to that of the thermal cure. In conclusion, the new microwave cure had approved to be applicable in a commercial plant.<br/>