• The monthly packaging world
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• no.6 s.182
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• pp.108-117
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• 2008

본 고에서는 플라스틱 소재의 인쇄나 코팅, 핫멜트 라미네이팅 필름 제조에 있어서 코로나 처리가 계면 접착에 미치는 영향에 어떤 현상으로 나타나는가를 2가지 방법으로 관찰하였다. 첫째, Tandem 압출기에서 코로나 바의 방전 극(Electrode)수를 각각 4개 1조 전극수인 것과 9개 1조 전극수인 2가지 방전 바 시스템으로 다르게 구성하여 코로나 방전의 효과가 경시 변화되는 경향과 구간별 표면장력이 지속되는 관계를 확인하기 위해 144시간 동안 Dynes를 측정 관찰한 결과 4개 전극수보다는 9개 전극 수 구성이 초기 Dynes도 높고, 48 Dynes 에서의 지속 기간이 길어져 방전밀도가 표면장력의 지속성과 관계있음을 확인하였다. 둘째, 코로나 처리한 베이스 필름과 압출 핫멜트 수지 코팅 계면 사이의 접착 형상, 핫멜트 층 표면의 코로나 처리 후의 형상에 대하여 주사 전자현미경으로 관찰하여 화학적, 물리적, 기계적 작용의 3가지 기능을 확인하고 비코로나 처리 경우와 비교하였다. 한편 압출 1차 EVA층과 2차 EVA층은 코로나 처리 없이도 안정적 결합을 하는 것을 확인하였다.

• Resources Recycling
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• v.27 no.2
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• pp.3-10
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• 2018

In this paper, Proposed bonding mechanism that can separate sole and upper for recycle and reuse of parts. It was confirmed that the PVC film with better physical properties than the existing parts was inserted between the sole and the upper. It was confirmed that the separation of the desired form can be induced. As a result of checking the performance of the proposed mechanism, it is confirmed that intentional separation is possible and the separated sole and upper can be recycled or reused.

• Applied Chemistry for Engineering
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• v.33 no.4
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• pp.381-385
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• 2022

It is very important to secure the adhesion durability between the base film and the conductive paste for the development of a sensor for detecting hazardous chemicals. In this study, an ester binder was used to improve the adhesive properties which can be a problem when applying the sensor to the cross cut 0B or 1B grade. This problem was found while evaluating the adhesive properties by coating the polyaniline/graphene nano plate (GNP) paste on the polyethylene terephthalate (PET) film. When 10 wt% or more of the ester-based binder was added, the cross cut grade to which the sensor can be applied was 3B or higher. It was confirmed that the excessive addition of the binder may affect the electrical properties of the conductive paste and actually decrease the reactivity to sulfuric acid. To improve the electrical property, a carbon black (CB) content was varied resulting in the optimum electrical property observed at 2 wt% of CB.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 1998.05a
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• pp.73-73
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• 1998

• Journal of Adhesion and Interface
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• v.14 no.4
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• pp.192-196
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• 2013

In this study, a series of bi-axially oriented films based on homo polypropylene (PP) and hydrocarbon resin (HCR) modified PP were prepared to investigate their mechanical properties, optical properties, permeability to gases and water vapors and shrinkage ratio. Hydrogenated dicyclopentadiene (DCPD) resin and hydrogenated C9 resin were used as HCR in this study. Bi-axially oriented polypropylene (BOPP) films made with PP/HCR blends showed better mechanical properties (higher Young's modulus), better optical properties (lower haze), lower permeability to gases and water vapors and increased shrinkage ratio than BOPP films made with homo-PP. Hydrogenated DCPD resin and hydrogenated C9 resin showed similar contribution to the improvement in mechanical properties and optical properties of BOPP films, but there are a differences in permeability to gases and water vapors and shrinkage ratio.

• Journal of Adhesion and Interface
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• v.5 no.1
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• pp.29-35
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• 2004

We have prepared polyster/nanQhybridized polyimide films in the range of 1~9 wt% of organophilic synthetic layered silicate (STN). Firstly, poly(amic acid)/STN nanocomposite solutions were prepared via solution blending method in DMAc or THF/MeOH solution, and then cast on the polyester film followed by imidization reaction, thermal and chemical method repestively. XRD and TEM experiment showed that the STN was fully exfoliated through the polyimide matrix. Surface morphologies of nanohybridized polyimide films were characterized by AFM and thermal, mechanical properties were also confirmed by TGA, DMA and UTM each. And also, the water vapor permeabilities highly depended on the content of STN. The sample from chemical imidization route and THF/MeOH solvent system showed better water vapor barrier properties than thermal one and DMAc system.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.12
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• pp.261-267
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• 2020

The demand for faster, lighter, and thinner portable electronic devices has brought about a change in semiconductor packaging technology. In response, a stacked chip-scale package(SCSP) is used widely in the assembly industry. One of the key materials for SCSP is a die-attach film (DAF). Excellent flowability is needed for DAF for successful die attachment without voids. For DAF with high flowability, two-step curing is often required to reduce a cure crack, but one-step curing is needed to reduce the processing time. In this study, DAF composition was categorized into three groups: cure (epoxy resins), soft (rubbers), hard (phenoxy resin, silica) component. The effect of the composition on a cure crack was examined when one-step curing was applied. The die-attach void and flowability were also assessed. The cure crack decreased as the amount of hard components decreased. Die-attach voids also decreased as the amount of hard components decreased. Moreover, the decrease in cure component became important when the amount of hard component was small. The flowability was evaluated using high-temperature storage modulus and bleed-out. A decrease in the amount of hard components was critical for the low storage modulus at 100℃. An increase in cure component and a decrease in hard component were important for the high bleed-out at 120℃(BL-120).

• Journal of Adhesion and Interface
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• v.10 no.2
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• pp.98-105
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• 2009

Poly(amic acid) was synthesized from the reaction of p-PDA/ODA and PMDA/BPDA and silane oligomer containing epoxy group was also synthesized from the reaction of tetramethylorthosilicate (TMOS) and glycidol. After hybridizing poly (amic acid) and silane oligomer, they were effectively converted into polyimide/silica hybrid films by thermal imidization process. As the silica contents in hybrid films increased, CTE values decreased from 17 ppm/K to 10 ppm/K and the tensile modulus increased, in spite of decreasing tensile strength. In addition, the peel test showed that the adhesion strength of hybrid film was enhanced from $0.43kg_f/cm$ to $1.02kg_f/cm$. Therefore, it could be concluded that the polyimide/silica hybrid film is effective to enhance adhesion strength for FCCL films.

• Proceedings of the Korean Vacuum Society Conference
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• 2012.02a
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• pp.355-355
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• 2012

액체 누설을 감지하는 센서를 개발하였다. 이 센서는 경보 장치를 포함하며 접착 테이프형태의 박막 센서이다. 센서는 총 4개의 층으로 구성되어 있다. 각 층의 명칭은 접착제층, 베이스 필름층, 기판 필름층, 보호 필름층이다. 감지선의 사용량을 최소화하여 기판 필름층 위에는 총 4개의 선이 있다. 전도선 3개와 저항선 1개이다. 4개의 선들은 기판 필름층에 전도성 은나노 잉크를 그라비어인쇄기를 이용하여 센싱 회로를 인쇄하였으며 이 기술의 이 센서의 가장 큰 특징이다. 누수 발생 시에 저항선과 전도선에 액체가 접촉되어 회로 상에 교차하는 내부저항의 전압 변화를 모니터링하여 누수를 감지하는 방식의 센서이다. 감지선에 전원을 양방향으로 번갈아 인가함으로써 수분의 저항 값 증가 및 양극화를 방지하였다. 그로 인해 기존의 센서에 비해 좀 더 안정적이고 정확한 감지를 할 수 있다. 설치 후 센서가 마모되거나 손상될 시 간단하게 재설치 할 수 있다는 장점도 있다. 액체 누설 후에도 별도의 건조시간이 필요하지 않다. 표면에 남아있는 액체를 제거하여 즉시 재사용하는 것이 가능하다. 액체누설 감지 시스템은 액체누설 감지 필름 센서를 포함하며, 표시부와 경고음 발생부 등 전체를 제어한다. 표시부의 누설 위치 표시 단위는 미터(m)이며 최소 0.1 m 단위까지 표시한다. 이 액체누설 감지 시스템을 이용하여 누설 위치 감지 실험 및 액체별 누설 위치 감지 실험을 진행하였다.

• Polymer(Korea)
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• v.26 no.3
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• pp.300-306
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• 2002

To study the effect of polymer compositions on the cell adhesion, copolymers of 3-(S)-[(dodecyloxycarbonyl) methyl]-1,4-dioxane-2,5-dione (DMD) and L-lactide were made, where DMD was synthesized form L-malic acid (L-MA) and glycolic acid. Furthermore, the copolymerization of DMD and L-lactide was performed using tin(II) octanoate as a catalyst. As a result of fixing RGD on the copolymer films, the cell adhesive peptide was fixable on the surface of the film. It was found out that the amount of fixation of RGD also increases by the increase in the amount of MA unit introduction. Since it is gradually decomposed over a long period and neither remains nor accumulation occurs, glycolic acid-$\beta$-dodecylmalate -lactic acid (D-PGML) is greatly expected as a potential biomaterial with improved slow degradability.