http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Plasma 처리 및 MmSH 사출방법으로 인한 PC/ABS와 PC상의 은도금 밀착성에 관한 연구
박기용(Ki Y. Park),이혜원(Hye W. Lee),이종권(Jong K. Lee) 한국표면공학회 2008 한국표면공학회지 Vol.41 No.1
Polycarbonate has a high transmittance to light, low specific gravity, flexibility and cost-effectiveness that extends the application field of the polymer to bio-engineering, optics, electronic parts, etc. Moreover, electro plating of metallic film on PC could endow the parts the electromagnetic interference shielding capability. However, poor adhesion of copper on PC limited the wide usage in the industry. In this work, a composite(PC/ABS) and MmSH(Momentary mold Surface Heating) injection process were used to improve the plating characteristics; plating thickness, gloss and adhesion. Also plasma treatment and chemical treatment were employed for improving adhesion. Plating characteristics on PC/ABS were better than those on PC due to the anchoring effect of butadiene. MmSH injection process could ameliorate the gloss and coating adhesion. Also plating thickness and adhesion of PC and PC/ABS were increased by plasma treatment.
[論文] Caustics방법에 의한 Polycarbonate의 J-적분값 결정에 관한 기초적 연구
이억섭(O. S. Lee),박기용(K. Y. Park) 한국자동차공학회 1990 오토저널 Vol.12 No.1
This study investigated a method for the determination of the J-integral for a tough glassy polymer such as polycarbonate plates by using the method of caustics. Comparing the values of J-integral determined by a numerical analysis and by the method of caustics, the method of caustics was found to be an effective experimental technique for the determination of the J-integral.<br/> The ratio between two J-integrals determined by the method of caustics and by finite element method converged into 1 within the limit oflow load. However, it was noticed that the greater the plastic zone at the crack tip was, the lower the J-integral obtained by the reflect method of caustics. This difference may be deduced from the damage at the crack tip such as craze appeared in the polycarbonate plate.<br/> It was confirmed that the ratio of Iongitudinal diameter(D_L) to transverse diameter (Dt) of caustics generally converged into 1 at the low load. The transition of the state of stress at the vicinity of a crack tip from plane strain to plane stress was deduced by noticing that the longitudinal diameter(D_I) grew faster than the transverse diameter(Dt) of caustics within the higher load range.