• Journal of the Microelectronics and Packaging Society
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• v.24 no.2
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• pp.69-74
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• 2017

Effect of post-annealing treatment times at $200^{\circ}C$ on the peel strength of screen-printed Ag film/polyimide substrate were systematically investigated by $180^{\circ}$ peel test for thermal reliability assessment of printed interconnect. Initial peel strength around 16.7 gf/mm increased up to 29.4 gf/mm after annealing for 24hours, and then sharply decreased to 22.3, 3.6, 0.6, and 0.1 gf/mm after 48, 100, 250, and 500 hours, respectively. Ag-O-C chemical bonding as well as binder organic bridges formations seemed to be responsible for interfacial adhesion improvement after the initial annealing treatment, while excessive Cu oxide formation at Cu/Ag interface seems to be closely related to sharp decrease in peel strength for longer annealing times.

• Journal of the Microelectronics and Packaging Society
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• v.29 no.2
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• pp.43-48
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• 2022

Effect of temperature/humidity (T/H) treatment conditions on the peel strength of screen-printed Ag/polyimide (PI) structures was evaluated by peeling PI films in 90° peel test. Initial peel strength was 25.99±1.47 gf/mm, and then decreased to 6.05±0.54 gf/mm after 500 h at 85℃/85% relative humidity T/H condition. And, the peeled locus was changed from Ag/PI interface to shallow cohesive inside PI near interface. X-ray photoelectron spectroscopy analysis on the peeled surfaces showed that the long-term moisture penetration into the Ag/PI interface during T/H treatment led to hydrolytic degradation of PI to form weak boundary layer inside PI near Ag/PI interface, which are responsible for large decrease in peel strength.

• Proceedings of the Korean Society For Composite Materials Conference
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• 2000.11a
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• pp.75-78
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• 2000

This study investigates the effect of surface treatment on the shear strength between aluminum panel and composite plate. The aluminum panel was surface-treated by DC Plasma and the composite Plate was surface-treated by ion beam. Lap shear test and T-peel test were performed to determine the shear strength and T-peel strength. Results showed that the shear strength of surface-treated case was 2.5 times higher than that of untreated case. The T-peel strength of treated case was more than 5 times higher than that of untreated case. SEM examination showed that the strength increase of surface-treated case was due to the more spread of epoxy to the panel.

• Journal of the Korean Applied Science and Technology
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• v.18 no.4
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• pp.316-324
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• 2001

To prepare an acrylic type pressure-sensitive adhesive, quarternary polymers were synthesized from butyl acrylate (BA), 2-ethyl hexyl acrylate (2-EHA), methyl methacrylate (MMA), and 2-hydroxy ethyl methacrylate (2-HEMA). The quarternary polymers were identified by FT-IR and Molecular weight was measured by Gel Pearmeation Chromatography. Also, viscosity, solid content and peel strength were examined. The peel strength was 160 $g_{f}/25$ mm when the volume ratio of feed monomer to solvent was 1.3:1, and the ratio was relevant to commercial usage. The pot life of adhesive was 30 sec at the 50 m/min of heat treatment rate at, and it indicated that the minimum drying time was 30 sec. In weathering resistance test, peel strength of $160{\sim}180$ $g_{f}/25$ mm after 1000 h, with no residual remains on the adhesive surface.

• Proceedings of the Korean Society Of Semiconductor Equipment Technology
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• 2004.05a
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• pp.101-107
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• 2004

각종 전자기기의 소형화, 고성능화 요구에 따라 회로 또는 기판의 고집적화에 따른 대안으로 도입된 COF(Chip On Film)공정에서 PI(polyimide)/buffer layer/Cu의 접착력 개선을 목적으로 본 연구가 진행 되었다. 그리고 buffer layer로써 Cr을 증착 할 때 부착력의 개선을 목적으로 개질처리를 할 때는 RF plasma장비를 사용하였다. 실험 변수로는 peel strength에 대한 buffer layer의 종류와 증착시간, 표면 개질처리시 $O_2$/Ar비이다. Buffer layer의 종류에 따른 접착력은 Cr보다 Ni이 우수하였고 peel strength와 Cu THK는 같은 buffer layer의 증착 structure에서 비례 관계를 나타냈으며, Cr의 증착 시간과 Cu의 증착 시간을 변수로 peel strength test한 값은 Cr증착시간이 30초, Cu증착시간이 20분일때 40g/mm로 최적의 접착력이 나타났다. 증착전 PI의 개질 처리시 $O_2$/Ar 유량비에 따른 peel strength값은 $O_2$/Ar유량비가 증가 할수록 향상되었으며, 2/5에서 최고값인 58g/mm가 나타났다. 그 이상에서는 오히려 감소하였다.

• Korean Journal of Metals and Materials
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• v.47 no.10
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• pp.675-680
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• 2009

Effects of $85^{\circ}C/85%$ Temperature/Humidity (T/H) treatment conditions on the peel strength of an electroless-plated Ni/polyimide system were investigated from a $180^{\circ}$ peel test. Peel strength between electroless-plated Ni and polyimide monotonically decreased from $37.4{\pm}5.6g/mm$ to $22.0{\pm}2.7g/mm$ for variation of T/H treatment time from 0 to 1000 hrs. The interfacial bonding mechanism between Ni and polyimide appears to be closely related to Ni-O bonding at the Ni/polyimide interface. The decrease in peel strength due to T/H treatment appears to be related to polyimide degradation due to moisture penetration through the interface and the bulk polyimide itself.

• Journal of fish pathology
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• v.33 no.2
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• pp.177-184
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• 2020

In an attempt to find a feed additive showing an anti-scuticociliate effect, extracts from Citrus unshiu Peel were tested against virulent scuticociliate infection. The most effective anti-scuticociliate killing activity in vitro was observed in the extract squeezed from homogenizing water-soaked dried tangerine peel (DTP). In addition, we have investigated the effect of DTP as a feed additive on growth rate and anti-parasitic activity of olivaceus flounder. DTP extract added diets (0.1, 0.5, 1, and 5%/feed weight) were fed to flounder for 7 days for checking a growth rate and 14 days for a challenging test. As a result, the feed conversion rate was significantly improved only in 1% DPT extract group compared to the control and 0.5% DTP extract fed group showed 100% of survival rate in the challenge test, all of which indicating that DTP extract would be a potential feed additive against scuticociliatosis.

• Journal of Welding and Joining
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• v.33 no.4
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• pp.44-49
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• 2015

The structural epoxy adhesive used in car body assembly needs the highest level of joint mechanical strength under lap shear, T-peel and impact peel conditions. In this study, the effect of nano functionalized block copolymer addition on the impact peel strength of epoxy adhesive was investigated. DSC analysis showed that the addition of nano functionalized block copolymer did not affect the curing reaction of epoxy adhesive. From single lap shear test, it was found out that the addition of nano functionalized block copolymer slightly decreased the cohesive strength of cured adhesive layer. The addition of nano functionalized block copolymer showed beneficial effect on T-peel strength by changing the adhesive failure mode to the mixed mode. However, the addition of nano functionalized block copolymer just decreased the room temperature impact peel strength. It was considered that the addition of nano functionalized block copolymer could have effect on disturbing the crack propagation only for the case of slow strain rate.

• Culinary science and hospitality research
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• v.23 no.8
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• pp.83-89
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• 2017

Dangyuja (Citrus gradis), a native citrus fruit of Jeju Island, has sour and bitter tastes. Dangyuja is rich in dietary fiber and enhance antioxidant activity. In this study, sponge cake was prepared by adding Dangyuja peel powder, and its quality characteristics were investigated. The freeze-dried Dangyuja peel powder was added to sponge cakes at a content of 0% (control), 2% (DP2), 4% (DP4), 6% (DP6) and 8% (DP8) of wheat flour weight. The specific gravity and baking loss of dough tended to increase with the amount of Dangyuja peel powder added, but the pH value as well as volume index of the cake were decreased. The symmetry index of cake tended to increase. Color values of sponge cake crust showed no significant difference, but L value and a value of crumb were decreased. The hardness and chewiness were increased with adding Dangyuja peel powder. Springiness was the highest at DP2 (91.79%). Cohesiveness did not showed significant difference among all samples. In a consumer preference test, cake groups with Dangyuja peel powder was higher than DP0 in color, texture, and overall acceptability. From these results, it was concluded that Dangyuja affects characteristics of sponge cakes. When making Dangyuja peel sponge cakes, it is suitable for adding 4% Dangyuja peel powder.

• Journal of the Korean Society of Food Science and Nutrition
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• v.37 no.1
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• pp.76-82
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• 2008

The quality and antioxidant activity properties of Jinyangju, Korean traditional rice wine made with different additions of Citrus junos peel (0, 10, 20, 30, and 40%) were investigated. The pH and the total sugar content of the Jinyangju decreased, whereas the total acidity and alcohol content increased with greater additions of Citrus junos peel. The color L-value increased and the color a- and b-values decreased with increasing amounts of Citrus junos peel. The DPPH (1,1-diphenyl-2-picryl-hydrazyl) free radical scavenging activity increased with the addition of Citrus junos peel. The highest overall acceptability values in the sensory test for color, flavor, taste, and overall favorite were 4.2, 4.9, 5.6, 5.0, and 3.9, respectively, with the addition of 20% Citrus junos peel.