• Composites Research
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• 제35권3호
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• pp.121-126
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• 2022

Owing to advantages of polymeric materials for hydrogen tank liner like light-weight property and high specific strength, polymer based composites have gained much attention. Despite of many benefits, polymeric materials for fuel cell tank cause problems which is critical to applications as low gas barrier property, and poor processability when adding fillers. For these reasons, improving gas barrier property of polymer composites is required to study for expanding application fields. This work presents impermeable polymer nanocomposites by introducing thin barrier coating using layer by layer (LBL) deposition method. Also, bi-layered and quad-layered nanocomposites were fabricated and compared for identifying relationship between deposition step and gas barrier property. Reduction in gas permeability was observed without interrupting mechanical property and processability. It is discussed that proper coating conditions were suggested when different coating materials and deposition steps were applied. We investigated morphology, gas barrier property and mechanical properties of fabricated nanocomposites by FE-SEM, Oxygen permeation analyzer, UTM, respectively. In addition, we revealed the mechanism of barrier performance of LBL coating using materials which have high aspect ratio.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2004년도 Asia Display / IMID 04
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• pp.985-987
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• 2004

A plastic substrate for flexible display is developed. The gas barrier property in the substrate is improved through depositing metal and metal oxide multi layer on plastic film by PVD process. The metal/metal-oxide multiplayer on plastic film shows excellent gas barrier property and optical property.

• 한국재료학회지
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• 제21권2호
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• pp.95-99
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• 2011

The microstructure and Cu diffusion barrier property of Ta-Si-N films for various Si and N compositions were studied. Ta-Si-N films of a wide range of compositions (Si: 0~30 at.%, N: 0~55 at.%) were deposited by DC magnetron reactive sputtering of Ta and Si targets. Deposition rates of Ta and Si films as a function of DC target current density for various $N_2/(Ar+N_2)$ flow rate ratios were investigated. The composition of Ta-Si-N films was examined by wavelength dispersive spectroscopy (WDS). The variation of the microstructure of Ta-Si-N films with Si and N composition was examined by X-ray diffraction (XRD). The degree of crystallinity of Ta-Si-N films decreased with increasing Si and N composition. The Cu diffusion barrier property of Ta-Si-N films with more than sixty compositions was investigated. The Cu(100 nm)/Ta-Si-N(30 nm)/Si structure was used to investigate the Cu diffusion barrier property of Ta-Si-N films. The microstructure of all Cu/Ta-Si-N/Si structures after heat treatment for 1 hour at various temperatures was examined by XRD. A contour map that shows the diffusion barrier failure temperature for Cu as a function of Si and N composition was completed. At Si compositions ranging from 0 to 15 at.%, the Cu diffusion barrier property was best when the composition ratio of Ta + Si and N was almost identical.

• 폴리머
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• 제32권1호
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• pp.38-42
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• 2008

메탄, 아세틸렌, hexamethyldisiloxane(HMDSO) 및 HMDSO+산소를 플라스마 중합시켜 식품포장용으로 사용되고 있는 저밀도 폴리에틸렌(LDPE) 필름의 표면에 얇은 박막을 코팅하여 LDPE 필름의 차단성을 향상시키고자 하였다. 산소에 대한 차단성은 HMDSO+산소(유량 : 0.6+9.0 SCCM) 플라스마로 40 W에서 10분간 코팅할 경우 가장 크게 향상되어 산소 투과도가 18.6배까지 감소되었으며, 이산화탄소와 수분에 대한 차단성은 아세틸렌(유량 : 0.75 SCCM) 플라스마로 10 W에서 10분간 코팅할 경우 가장 크게 향상되어 이산화탄소와 수분 투과도가 각각 12.0배와 3.0배까지 감소되었다. 또한, 이렇게 코팅된 필름을 사용하여 방울토마토, 오이, 팽이버섯 등을 포장할 경우, 신선도 유지기간이 코팅 전에 비하여 $1.5{\sim}3.0$배까지 연장되었다.

• 폴리머
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• 제24권6호
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• pp.820-828
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• 2000

본 연구에서는 블렌드 내의 분산상을 잘 발달된 판상 구조로 발현시켜 폴리프로필렌 (PP)/에틸렌 비닐알코올 공중합체 (EVOH) 블렌드의 차단 성질을 향상시키기 위하여 필름 제조 공정으로써 이축연신 공정을 사용하였다. 분산상 수지와 연속상 수지의 점도비로부터 용융 압출 공정시 변형의 정도를 파악하기 위하여 각 수지의 유변물성을 측정하였으며, 상용화제 함량과 연신 배율 및 연신 온도 등이 이축연신 블렌드 필름의 산소 투과도와 모폴로지에 미치는 영향을 조사하였다. l5 wt%의 EVOH를 첨가한 PP/EVOH 블렌드 필름의 산소차단성은 EVOH 분산상이 이축연신에 의해 넓은 면적의 판상구조로 발현되어 순수 PP에 비해 10배 정도까지 증가한 것으로 나타났다. 모폴로지를 조절하친 두 상간의 계면결합력을 증진시키기 위하여 PP-g-MAH와 ionomer를 사용한 결과, 차단 효과를 효과적으로 향상시키기 위해서는 상용화제를 블렌드에 최적의 함량으로 첨가해야 한다는 사실을 알 수 있었다. 또한 높은 연신 배율과 연신 온도로 이축연신하여 제조된 블렌드 필름에서 더욱 뚜렷한 판상 모폴로지가 관찰되었으며, 차단효과는 증가한 것으로 나타났다.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2012년도 제42회 동계 정기 학술대회 초록집
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• pp.458-458
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• 2012

Fuel Cell is used stacking metal or polymer substrate. This hydro property of substrate surface is very important. Usually, surface property is hydrophilic. The surface oxidation of SUS is investigated through plasma treatments with an atmospheric-pressure dielectric barrier discharge (DBD) for increasing hydrophilic property. The plasma process makes an experiment under various operating conditions of the DBD, which operating conditions are treatment time, plasma gas mixture ratio, the plasma source supply frequency. Two kinds of SUS substrate, SUS-304 and SUS 316L, were used. Discharge frequency has a crucial impact on equipment performance and gas treatment. After the plasma treatment of a SUS plate, highly improved wettability was noted. But, when high oxygen supply, the substrate damaged seriously.

• Food Science and Biotechnology
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• 제15권1호
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• pp.133-137
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• 2006

Wheat gluten-chitosan composite film (WGCCF) can prevent moisture migration and enhance the antimicrobial properties of gluten in intermediate-moisture foods like sandwiches. To mimic the structure of actual sandwich-type products we developed multi-layer food models, where moisture content and water activity differ. Water activity gradients direct moisture migration and therefore determine product characteristics and product stability. A 10% wheat gluten film-forming solution was mixed with chitosan film-forming solution (0-3%, w/w) and evaporated to generate WGCCF. Addition of 3% chitosan enhanced the mechanical properties of the film composite, lowered its water vapor permeability, and improved its ability to protect against both, Streptococcus faecalis and Escherichia coli, in a 24 hr sandwich test (reduction of 1.3 and 2.7 log cycles, respectively, compared to controls). Best barrier and antimicrobial performance was found for 3% chitosan WGCCF at pH 5.1. Film of this type may find application as barrier film for intermediate-moisture foods.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1998년도 추계학술대회 논문집
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• pp.21-24
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• 1998

The properties of ZrN layer deposited by Sputtering system have been investigated in the application of diffusion barrier layer to copper. ZrN layer exhibited a excellent barrier property up to $700^{\circ}$ and higher resistivity. If an excess $O_2$is protected during the process of ZrN deposition, ZrN layer will be possible to use a diffusion barrier layer to copper.

• 한국응용과학기술학회지
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• 제26권3호
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• pp.288-296
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• 2009

In this study, the silica-based hybrid material with high barrier property was prepared by incorporating ethylene-vinyl alcohol (EVOH) copolymer, which has been utilized as packaging materials due to its superior gas permeation resistance, during sol-gel process. In preparation of this EVOH/$SiO_2$ hybrid coating materials, the (3-glycidoxy-propyl)-trimethoxysilane (GPTMS) as a silane coupling agent was employed to promote interfacial adhesion between organic and inorganic phases. As confirmed from FT-IR analysis, the physical interaction between two phases was improved due to the increased hydrogen bonding, resulting in homogeneous microstructure with dispersion of nano-sized silica particles. However, depending on the range of content of added silane coupling agent (GPTMS), micro-phase separated microstructure in the hybrid could be observed due to insufficient interfacial attraction or possibility of polymerization reaction of epoxide ring in GPTMS. The oxygen barrier property of the mono-layer coated BOPP (biaxially oriented polypropylene) film was examined for the hybrids containing various GPTMS contents. Consequently, it is revealed that GPTMS should be used in an optimum level of content to produce the high barrier EVOH/$SiO_2$ hybrid material with an improved optical transparency and homogeneous phase morphology.

• 폴리머
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• 제37권6호
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• pp.770-776
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• 2013

낮은 기체투과성을 보이는 epoxidized natural rubber 50(ENR 50)에 매우 낮은 기체투과성을 가지고 있고 마모 특성이 우수한 Nylon 6를 이축형 압출기를 사용해서 블렌드하였다. 혼합물의 기계적 물성과 기체차단성이 향상되는 효과를 얻었으나 ENR 50 매트릭스상에 Nylon 6의 분산성이 떨어져 큰 상승효과를 보이지는 않았다. 따라서 Nylon 6의 분산성을 개선하기 위해 ENR 50에 maleic anhydride(MAH)를 그래프트시켰다. MAH와 ENR 50간의 그래프트 반응은 FTIR 스펙트럼을 통해서 확인할 수 있었다. ENR 50-g-MAH/Nylon 6 배합물을 제조함으로 인해 기체차단성, 기계적 물성이 MAH를 사용하지 않았을 때보다 향상시킬 수 있었다. MAH의 그래프트 비율을 최대로 높인 5 phr을 첨가하였을 때 가교밀도가 높았으며 가장 좋은 물성을 보였다.