• Composites Research
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• 제17권4호
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• pp.47-52
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• 2004

본 논문에서는 사출성형법과 용매를 이용한 필름 캐스팅 방법을 혼용하여 MWNT/PMMA 나노복합재료의 제작방법을 확립하였다. 본 제작법을 이용하여, PMMA 모재 내에서 MWNTs의 분산도를 향상시킬 수 있었고 또한 분산상을 유지하면서 복합재료를 제작할 수 있었다. 제작된 복합재료의 기계적 물성을 측정하였고, 주사현미경 사진을 이용하여 파단면에서의 분산도를 확인해 보았다. 아울러 계면활성제가 MWNTs의 분산도 향상 및 기계적 물성 향상에 미치는 영향을 알아보았다

• Elastomers and Composites
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• 제31권1호
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• pp.23-32
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• 1996

PVB was blended with PMMA in order to recycle scraped PVB material which recovered in the safety glass manufactories. The purpose of this research on PVB/PMMA blend was applied with excellent tackiness and transparency of PVB as a material of high strength to make the maximum use. Also, the blending of PVB with PMMA was aimed at the increase of impact strength of PMMA because the elastic property of PVB might decrease the brittleness of PMMA due to the lack of inner impact resistance. Izod impact resistance was propotional to increase the content of PVB, which was predominantly increased in the addition of 10phr above MBS. High rate impact resistance showed a tendency to Increase but it showed a tendency to decrease maximum load and energy if the contents of PVB increased. On the other hand total energy and ductile index showed a tendency to increase excellent impact resistance in the addition of MBS contents. As a result of observed surface of PVB/PMMA blends, the size of PVB domain increased distribution homogenuously, in the addited MBS contents increased it showed distribution homogeneously and partially a wetability.

• 공업화학
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• 제5권1호
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• pp.182-188
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• 1994

PMMA와 본질적으로 비상용성인 PB에 MMA를 그라프트 중합시켜서 이를 PMMA와 블렌드하여 그라프트율 변화에 따른 내충격성, 인장강도, haze 변화 및 상용성변화를 SEM, DSC, Instrone 등을 통하여 관찰하였다. Poly(butadlene-g-MMA)의 그라프트율이 증가함에 따라서, MMA 그라프트로 인한 PMMA와의 상용성의 증가에 의하여 PMMA-poly(butadlene-g-MMA) 블렌드의 인장강도, 내충격성 및 투명성 등이 그라프트하지 않은 PB-PMMA 블렌드에 비하여 향상되는 결과를 나타내었다. 반면에, 투명성은 PMMA 단독수지에 비해서는 다소 떨어지는 결과를 나타내었다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2008년도 추계학술대회 논문집 Vol.21
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• pp.37-37
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• 2008

에어로졸데포지션법을 이용하여 집적화 기판을 위한 $Al_2O_3$-PMMA 복합체 후막을 상온에서 구리 기판 위 에 제조하였다. XRD, FT-IR 분석을 통해 코팅된 막은 $Al_2O_3$와 PMMA의 혼합물로 존재함을 확인하였으며 성막 중 $Al_2O_3$. PMMA의 상호작용과 PMMA 파우더의 거동에 대한 분석을 통해 $Al_2O_3$-PMMA 복할체 후막의 성막 양상을 확인할 수 있었다. 또한 기판 거칠기에 따라 초기 계면의 양상이 달라질 수 있음을 확인하였고 이러한 초기 계면의 상태가 $Al_2O_3$-PMMA 복합체 후막의 제조에 있어 매우 중요함을 알 수 있었다. 본 연구에서는 에어로졸데포지션법을 이용한 $Al_2O_3$-PMMA 복합체 후막의 성막 양상을 통해 세라믹-폴리머 복합체의 제조에 있어서의 주요 변수들을 알아보고 $Al_2O_3$-PMMA 복합체 후막의 전기적인 특성을 확인하였다.

• Transactions on Electrical and Electronic Materials
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• 제17권4호
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• pp.204-207
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• 2016

Experimental study of UV-irradiated O₂/H₂ gas phase cleaning for PMMA (Polymethylmethacrylate) removal is carried out in a load-locked reactor equipped with a UV lamp and PBN heater. UV enhanced O₂/H₂ gas phase cleaning removes polymethylmethacrylate (PMMA) better at lower process pressure with higher content of H₂. O₂ gas compete for UV (184.9 nm) absorption with PMMA producing O₃, O(¹D) and lower dissociation of PMMA. In our experimental conditions, etching reaction of PMMA at the substrate temperature between 75℃ and 125℃ had activation energy of about 5.86 kcal/mol indicating etching was controlled by surface reaction. Above the 180℃, PMMA removal was governed by a supply of reaction gas rather than by substrate temperature.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2005년도 춘계학술대회 논문집
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• pp.29-32
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• 2005

Poly (methyl methacrylate) (PMMA) is one of the promising representive of polymer gate dielectric for its high resistivity and sutible dielectric constant. PMMA (Mw=96700) films were prepared on p-Si by spin coating method. PMMA were coated compactively and flatly as observeed by AFM. MIS(Al/PMMA/p-Si) structure was made and capacitance-voltage (C-V) and current-voltage (I-V) measurements were done with PMMA films for different thermal treatment temperature. PMMA films were showed proper dielectric constant and breakdown voltage. Above the glass transition temperature PMMA films degraded. C-V measured at various frequencies, dielectric constant increased a little. The absence of hysteresis in the C-V characteristics, which eliminate the possibility of mobile charges in the PMMA films. The observed thermal stability, smooth surfaces, dielectric constant, I-V behavior implies PMMA formed by spin coating can be used as an efficient gate dielectric layer in OTFTs.

• 한국전기전자재료학회논문지
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• 제29권3호
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• pp.135-140
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• 2016

In this study, we developed the solution-processed PMMA-$HfO_x$ hybrid ReRAM devices to overcome the respective drawbacks of organic and inorganic materials. The performances of PMMA-$HfO_x$ hybrid ReRAM were compared to those of PMMA- and $HfO_x$-based ReRAMs. Bipolar resistive switching behavior was observed from these ReRAMs. The PMMA-$HfO_x$ hybrid ReRAMs showed a larger operation voltage margin and memory window than PMMA-based and $HfO_x$-based ReRAMs. The reliability and electrical instability of ReRAMs were remarkably improved by blending the $HfO_x$ into PMMA. An Ohmic conduction path was commonly generated in the LRS (low resistance state). In HRS (high resistance state), the PMMA-based ReRAM showed SCLC (space charge limited conduction). the PMMA-$HfO_x$ hybrid ReRAM and $HfO_x$-based ReRAM revealed the Pool-Frenkel conduction. As a result of flexibility test, serious defects were generated in $HfO_x$ film deposited on PI (polyimide) substrate. On the other hand, the PMMA and PMMA-$HfO_x$ films showed an excellent flexibility without defect generation.

• 자원리싸이클링
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• 제15권6호
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• pp.25-32
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• 2006

본 연구에서는 폐자동차의 재활용 향상을 위하여 전량 소각 및 매립에 의해 처리되고 있는 폐자동차 tail lamp를 해체공정에서 회수하고, 마찰하전형정전선별법을 적용하여 재질분리 연구를 수행하였다. 하전특성 연구결과 PMMA재질이 폐자동차 tail lamp의 재질분리에 효과적인 하전물질로 확인되어, PMMA재질을 사용한 cyclone 하전장치를 개발하였다. 본 연구에서 개발된 cyclone 하전장치를 이용한 마찰하전형정전선별 실험결과, 최적 실험조건에서 폐자동차 tail lamp로부터 PMMA 재질의 품위와 회수율이 각각 99.0%와 90.2%인 결과를 얻어, 폐자동차 tail lamp를 재활용 할 수 있는 재질분리 기술을 확립하였다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2000년도 추계학술대회 논문집
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• pp.347-350
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• 2000

The purpose of this study is to research and develop solid polymer electrolyte(SPE) for Li polymer battery. The temperature dependence of conductivity, impedance spectroscopy and electrochemical properties of PMMA/PVDF electrolytes as a function of a mixed ratio were reported for PMMA/PVDF based polymer electrolyte films, which were prepared by thermal gellification method of preweighed PMMA/PVDF, plasticizer and Li salt. The ion conductivity of PMMA/PVDF electrolytes was 10$\^$-3/S/cm, which may be applicable to a constituent of lithium secondary battery. 5PMMA20PVDFLiC1O$_4$PC$\sub$8/EC$\sub$8/ electrolyte remains stable up to 5V vs. Li/Li$\^$+/. Steady state current method and AC impedance were used for the determination of transference numbers in PMMA/PVDF electrolyte film. The transference number of 5PMMA20PVDFLiC1O$_4$PC$\sub$8/EC$\sub$8/ electrolyte is 0.55.

• Nuclear Engineering and Technology
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• 제56권9호
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• pp.3758-3763
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• 2024

The current study aimed to evaluate the suitability of polyester resin as an alternative material to polymethyl methacrylate (PMMA) for computed tomography (CT) dosimetry phantoms using the GEANT4/GATE Monte Carlo simulation platform. Cylindrical phantoms (32 cm diameter) constructed of polyester resin and PMMA were simulated and compared in terms of atomic composition, effective atomic number, electron density, mass density, and photon interaction mechanisms. Weighted CT dose index (CTDIw) values were calculated for each phantom at 80, 110, and 130 kVp tube voltages based on measurements of CTDI_100,c and CTDI_100,p. Results demonstrated that the physical properties of polyester closely matched those of PMMA, and the polyester phantom displayed equivalent dosimetric behavior to the PMMA phantom at all tube voltages tested. CTDIw values from the polyester phantom were within 1.4 % of the PMMA phantom across all tube voltages. Conversion coefficients were derived to equate polyester CTDIw values to PMMA dose equivalents. This study found that a polyester resin phantom exhibited radiation dosimetry commensurate with the standard PMMA phantom for CT dose assessment. Consequently, polyester resin represents a viable substitute material when PMMA is unavailable for construction of CT dosimetry phantoms.