• Title/Summary/Keyword: Plastic adhesion

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A Study on the Improvement of Adhesion according to the Process Variables of Ion Beam in the Cu/Polyimide Thin Film (이온빔의 공정변수에 따른 Cu/Polyimide 박막의 접착력향상에 관한 연구)

  • Shin Youn-Hak;Kim Myung-Han;Choi Jae-Ha
    • Korean Journal of Materials Research
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    • v.15 no.7
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    • pp.458-464
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    • 2005
  • In microelectronics packaging, the reliability of the metal/polymer interfaces is an important issue because the adhesion strength between dissimilar materials is often inherently poor. The modification of polymer surfaces by ion beam irradiation and rf plasma is commonly used to enhance the adhesion strength of the interface. T-peel strengths were measured using a Cu/polyimide system under varying $N_2^+$ ion beam irradiation conditions for pretreatment. The measured T-peel strength showed reversed camel back shape regarding the fixed metal-layer thickness, which was quite different from the results of the 90° peel test. The elementary analysis suggests that the variation of the T-peel strength is a combined outcome of the plastic bending work of the metal and polymer strips. The results indicate that the peel strength increases with $N_2^+$ ion beam irradiation energy at the fixed metal-layer thickness.

A Study on the Improvement of Adhesion according to the Surface Modification of Cu/Polyimide Films by ion Beam Irradiation (이온빔에 의한 Cu/Polyimide 표면개질에 따른 접착력향상에 관한 연구)

  • Shin Youn-Hak;Chu Jun-Sick;Lee Seoung-Woo;Jung Chan-Hoi;Kim Myung-Han
    • Korean Journal of Materials Research
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    • v.15 no.1
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    • pp.42-46
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    • 2005
  • In microelectronics packaging, the reliability of the metal/polymer interfaces is an important issue because the adhesion strength between dissimilar materials is often inherently poor. The modification of polymer sufaces by ion beam irradiation and rf plasma are commonly used to enhance the adhesion strength of the interface. T-peel strengths were measured using a Cu/polyimide system under varying $Ar^+$ ion beam irradiation pretreatment conditions. The measured T-peel strength showed reversed camel back shape regarding the fixed metal-layer thickness, which was quite different from the results of the $90^{\circ}$ peel test. The elementary analysis suggests that the variation of the T-peel strength is a combined outcome of the plastic bending work of the metal and polymer strips. The results indicate that the peel strength increases with $Ar^+$ ion beam irradiation energy at the fixed metal-layer thickness.

The Effect of the Plasma Treatment on PLGA Scaffold for Adhesion and Chondrogenic Differentiation of Human Adipose-derived Stromal Cells (인체지방유래 간질세포의 부착 및 연골분화유도를 위한 PLGA 지지체의 플라즈마 처리 효과)

  • Dong, Chun Ji;Jun, Young Joon;Cho, Hyun Mi;Oh, Deuk Young;Han, Dong Keun;Rhie, Jong Won;Ahn, Sang Tae
    • Archives of Plastic Surgery
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    • v.33 no.1
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    • pp.46-52
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    • 2006
  • High-density micromass culture was needed to take three dimensions culture with ASCs(adipose derived stromal cells) and chondrogenesis. However, the synthetic polymer has hydrophobic character and low affinity to cells and other biomolecules. Therefore, the surface modification without changes of physical and chemical properties is necessary for more suitable condition to cells and biomolecules. This study was performed to investigate the effect of surface modification of poly (lactic-co-glycolic acid)(PLGA) scaffold by plasma treatment (P(+)) on the adhesion, proliferation and chondrogenesis of ASCs, and not plasma treatment (P(-)). ASCs were isolated from human subcutaneous adipose tissue obtained by lipectomy and liposuction. At 1 hour 30 minutes and 3days after cell seeding onto the P(-) group and the P(+) group, total DNA amount of attached and proliferated ASCs markedly increased in the P(+) group (p < 0.05). The changes of the actin under confocal microscope were done for evaluation of cellular affinity, at 1 hour 30 minutes, the shape of the cells was spherical form in all group. At 3rd day, the shape of the cells was fiber network form and finely arranged in P(+) group rather than in P(-) group. RT-PCR analysis of cartilage-specific type II collagen and link protein were expressed in 1, 2 weeks of induction. Amount of Glycoaminoglycan (GAG) markedly increased in P(+) group(p < 0.05). In a week, extracellular matrix was not observed in the Alcian blue and Safranin O staining. However in 2 weeks, it was observed that sulfated proteoglycan increased in P(+) group rather than in P(-) group. In conclusion, we recognized that plasma treatment of PLGA scaffold could increase the hydrophilic property of cells, and provide suitable environment for high-density micromass culture to chondrogenesis

Formation of a Buffer Layer on Mica Substrate for Application to Flexible Thin Film Transistors (운모 기판을 플렉시블 다결정 실리콘 박막 트랜지스터에 적용하기 위한 버퍼층 형성 연구)

  • Oh, Joon-Seok;Lee, Seung-Ryul;Lee, Jin-Ho;Ahn, Byung-Tae
    • Korean Journal of Materials Research
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    • v.17 no.2
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    • pp.115-120
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    • 2007
  • Polycrystalline silicon (poly-Si) thin film transistors (TFTs) might be fabricated on the mica substrate and transferred to a flexible plastic substrate because mica can be easily cleaved into a thin layer. To overcome the adhesion and stress problem between poly-Si film and mica substrate, a buffer layer consisting of $SiO_x/Ta/Ti$ three layers has been developed. The $SiO_x$ layer is for electrical isolation, the Ti layer is for adhesion of $SiO_{x}$ and mica. and Ta is for stress relief between $SiO_x$ and Ti. A TFT was fabricated on the mica substrate by a conventional Si process and was successfully transferred to a plastic substrate.

Effect of Paraffin Oil on the Low Temperature Adhesion Properties of CR/SBS Modified Asphalt Sealants (CR/SBS 개질 아스팔트 실란트의 저온접착특성에서 파라핀 오일 첨가에 의한 효과)

  • Kim, Doo Byung;Lee, Dae Woo;Kim, Jong-Seok
    • Korean Chemical Engineering Research
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    • v.50 no.1
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    • pp.6-10
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    • 2012
  • The main objective of this work was studying the influence of paraffin oil(PO) on the adhesion properties at low temperature in styrene-butadiene-styrene(SBS) copolymer and crumb rubber(CR) modified asphalt. The temperature susceptibility of SBS/CR asphalt and PO/SBS/CR/asphalt blends were measured by penetration and softening point. Adhesion properties at low temperature and dispersion of modifiers in PO/SBS/CR/asphalt blends were evaluated by universal test machine and florescence microscopy, respectively. The adhesion properties of PO/SBS/CR/asphalt blends at low temperature increased in the proportion of SBS contents with both 5 and 10 wt % of paraffin oil. Results showed that the maximum tensile adhesion strength and toughness energy at $-20^{\circ}C$ were obtained when PO and SBS contents were 10 wt % and 6 wt %, respectively. The addition of PO is effective for enhancing the flexibility of SBS/CR/asphalt blends and leads to the increase of toughness at low temperature.

Measurement of Adhesion Strength between Oxidized Cu-based Leadframe and EMC (산화처리된 구리계 리드프레임과 EMC 사이의 접착력 측정)

  • Lee, Ho-Young;Yu, Jin
    • Korean Journal of Materials Research
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    • v.9 no.10
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    • pp.992-999
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    • 1999
  • Due to the inherently poor adhesion strength of Cu-based leadframe/EMC(Epoxy Molding Compound) interface, popcorn-cracking phenomena of thin plastic packages frequently occur during the solder reflow process. In this study, in order to enhance the adhesion strength of Cu-based leadframe/EMC interface, brown-oxide layer was formed on the leadframe surface by immersing of leadframe sheets in hot alkaline solution, and the adhesion strength of leadframe/EMC interface was measured by using SDCB(Sandwiched Double Cantilever Beam) and SBN(Sandwiched Brazil-Nut) specimens. Results showed that brown oxide treatment of leadframe introduced fine acicular CuO crystals on the leadframe surface and improved the adhesion strength of leadframe/EMC interface. Enhancement of adhesion strength was directly related to the thickening kinetics of oxide layer. This might be due to the mechanical interlocking of fine acicular CuO crystals into EMC.

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Adhesion Properties on the Molecular Weight and Various Substrates of Multi-layered Structural Acrylic Adhesive (다층구조형 아크릴 점착제의 분자량 및 피착재 종류에 따른 접착특성)

  • Kim, Dong-Bok
    • Polymer(Korea)
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    • v.39 no.3
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    • pp.514-521
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    • 2015
  • In this study, we would like to describe peel strength and dynamic shear property on various substrates of multi-layered structural double-sided adhesive tape with or without adhesive (AD) prepared by UV curing for an automobile, construction, and display junction. According to adapt the adhesive, the peel and dynamic shear strength of adhesion tape prepared with acrylic foam or various plastic substrates increased with increasing molecular weight, however, decreased over 650000 molecular weight. The adhesion property shows high value at the thin AD layer with decreasing temperature. The interface property shows highest at MW 615000 (AD-4), and the interface junction below MW 615000 resulted to divide from acrylic foam and adhesive layer. From this study, the multi-layered structural double-sided adhesive tapes seem to be a useful for industrial area such as a low surface energy plastic material and curved substrate.

Sequential Management of Pierre Robin Sequence: Case Report (상기도 폐쇄를 보이는 Pierre Robin Sequence 환아의 순차적 치료: 증례보고)

  • Kim, Bae-Kyung;Kwon, Yong-Dae;Ryu, Sun-Youl;Choi, Yong-Ha;Ohe, Joo-Young;Suh, Joon-Ho;Ko, Su-Jin
    • Maxillofacial Plastic and Reconstructive Surgery
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    • v.33 no.3
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    • pp.270-275
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    • 2011
  • Pierre Robin Sequence (PRS) is known as an anomaly consisting of respiratory obstruction with glossoptosis, micrognathia and cleft palate in a newborn. The etiology of PRS is not known, but several factors may be involved simultaneously. Mortality rate of PRS is about 5~30% and the treatment method is divided into both conventional treatments and surgical interventions. If the respiratory obstruction is not resolved by the conventional method, surgical treatment, such as subperiosteal release of the floor of the mouth, tongue-lip adhesion, tracheostomy, distraction osteogenesis may be needed. This study reports a case of PRS in a newborn male at 20 days, with dyspnea and feeding difficulties. Clinical examination showed micrognathia with glossoptosis and cleft palate as the typical PRS triad. We tried surgical intervention with subperiosteal release of the floor of the mouth and tongue-lip adhesion and surgery was successful. At $19^{th}$ months, we also repaired the incomplete cleft palate successfully using 2-Flap palatoplasty.

Synthesis and Characterization of Poly(Urethane-Methyl methacrylate) Hybrid Emulsion as a Plastic Coating Resin (플라스틱 코팅용 Poly(Urethane-MMA) 혼성 에멀젼 합성 및 특성 연구)

  • Yeom, Ji-Yoon;Baek, Kyung-Hyun;Lee, Jun-Young;Yi, Gyoung-Bae;Yoo, Byung-Won;Kim, Jung-Hyun
    • Journal of Adhesion and Interface
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    • v.8 no.1
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    • pp.8-14
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    • 2007
  • Poly(urethane-methyl methacrylate) hybrid emulsions can be controlled with their thermal, mechanical and anti-chemical properties as plastic coating materials. In this study, water dispersed poly(urethane-methyl methacrylate) hybrid emulsions were prepared by prepolymer synthesis and soap free emulsion polymerization. For imparting hydrophilicity on polyurethane prepolymer, 2,2-bis (hydroxymethyl) propionic acid was added to the polyurethane prepolymer with methyl methacrylate monomer and was neutralizated by triethylamine (TEA). After neutralization, the prepolymer mixture was dispersed in the water phase with stable droplets. The synthesis was carried out with chain extension from the ethylene diamine and initiation of methyl methacrylate by soap free emulsion polymerization. Stable poly(urethane-methyl methacrylate) hybrid emulsion was successfully obtained with different synthetic conditions and acrylic monomer contents. Poly(urethane-methyl methacrylate) hybrid emulsion were characterized and compared with tensile strength, viscosity, and adhesion properties.

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A CASE REPORT OF EAGLE'S SYNDROME WITH TMJ INTERNAL DERANGEMENT (악관절내장증을 동반한 Eagle's Syndrome)

  • Park, Kwang-Ho;Kim, Hyung-Gon;Yoon, Jung-Ho;Jeong, Sang-Hoon;Park, Jung-Hyun;Kim, Ki-Jeong
    • Maxillofacial Plastic and Reconstructive Surgery
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    • v.16 no.4
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    • pp.458-463
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    • 1994
  • A thirty two year-old male was referred with a chief complaint of mouth opening limitation, and maxillofacial pain including left TMJ area. The patient had been treated in a private clinic with medications and conservative treatments, without any improvements in symptoms. MRI findings showed a limitations in condylar head movements, and signs of disc adhesion without the Positional change. Panoramic views showed elongation of stylohyoid process. Brain C-T was taken due to the patient's complaint of headache, facial pain, and paresthesia of tongue, and the result showed no abnormalities. The first surgery included meniscoplasty and the removal of disc adhesion of left TMJ under the preliminary diagnosis of internal derangement with adhesion, and the patient displayed marked improvements in opening movements despite of persistent hemiparesthesia of left facial areas and tongue, and mild dysphasia. Therefore, the second surgery was carried out with the preliminary diagnosis of Eagle's Syndrome, and a resolution of neurologic symptoms was obtained. The final diagnosis of this case was Eagle's Syndrome with internal derangement, and the difficulties in diagnosis and treatment might be due to the existence of two separate diseases with similar symptoms.

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