• 대한기계학회:학술대회논문집
• /
• 대한기계학회 2000년도 춘계학술대회논문집A
• /
• pp.772-779
• /
• 2000

The friction and wear behavior of short carbon fiber reinforced polyetheretherketone was studied experimentally under dry sliding conditions against SCM440(AISI 4140) disks with a different surface roughness and hardness at the low sliding speeds and the high pressures on a pin-on-disk apparatus. Under the low disk surface roughness value the earsplitting noise and stick-slip were occurred. The increased adhesion friction and wear factor with stick-slip made the friction and wear behavior worse. Under the high disk surface hardness the break and falling-off of carbon fibers were accelerated. The carbon fibers fallen off from the matrix were ground into powder between two wear surfaces and this phenomenon caused a abrasive friction and wear factor to increase. So the friction and wear behavior became worse. With the transfer film made of wear particles formed on a disk, the carbon powder film formed on a pin lowered a friction coefficient.

• 한국전기화학회:학술대회논문집
• /
• 한국전기화학회 2005년도 수소연료전지공동심포지움 2005논문집
• /
• pp.83-86
• /
• 2005

• 대한기계학회논문집A
• /
• 제25권6호
• /
• pp.930-937
• /
• 2001

The friction and wear behavior of short carbon fiber reinforced polyetheretherketone was studied experimentally under dry sliding conditions against SCM440(AISI 4140) disks with different surface roughness and hardness at the low sliding speeds and the high pressures on a pin-on-disk apparatus. Under the low disk surface roughness value the earsplitting noise and stick-slip were occurred. The increased adhesion friction and wear factor with stick-slip made the friction and wear behavior worse. Under the high disk surface hardness the break and falling-off of carbon fibers were accelerated. The carbon fibers fallen off from the matrix were ground into powder between two wear surfaces and this phenomenon caused abrasive friction and wear factor to increase. So the friction and wear behavior became worse. With the transfer film made of wear particles formed on a disk, the carbon powder film formed on a pin lowered a friction coefficient.

• 한국수소및신에너지학회논문집
• /
• 제28권1호
• /
• pp.17-23
• /
• 2017

Polyether ether ketone (PEEK) composite including tungstophosphoric acid(TPA) membranes have been intensively investigated for polymer electrolyte membrane water electrolysis (PEMWE) and thus covalently linked sulfonated polyether ether ketone (CL-SPEEK) with captured TPA composite membranes were prepared and characterized. Sulfonated polyether ether ketone (SPEEK) was prepared in sulfonation of PEEK and was cross-linked with 1,4 diiodobutane. The carbonyl group of SPEEK was reduced with $NaBH_4$ and 3-isocyanatepropyltriethoxysilane (ICPTES) was added. The TPA captured composite was prepared in reaction of TPA with 3-mercaptopropyltrime thoxysilane (MPTMS). The polymer composite membranes showed better thermostability and electrochemical properties than SPEEK. The membranes were prepared by sol-gel casting method. The polymer composite membrane featured 0.1285 S/cm of proton conductivity at $80^{\circ}C$ and outstanding durability.

• 한국수소및신에너지학회논문집
• /
• 제28권4호
• /
• pp.338-344
• /
• 2017

Polyoxometal molybdophosphoric acid (MoPA) bonded polyether ether ketone (PEEK) composite membrane for water electrolysis has been investigated. The composited membrane, covalently cross linked (CL) sulfonated polyether ether ketone (SPEEK) with a bonded MoPA, was prepared in sulfonation of PEEK, cross linkage reaction with 1,4-diiodobutane, and addition with MoPA. PEEK was covalently cross-linked with 1,4-diiodobutane to improve mechanical strength and was added with MoPA to increase proton conductivity. MoPA should be fixed to back bone of SPEEK to prevent bleeding out. Therefore, the carbonyl group of SPEEK was reduced with NaBH4 and 3-isocyanatepropyltriethoxysilane (ICPTES) was added. The MoPA bonded composite was produced in the reaction of MoPA with 3-mercaptopropyltrimethoxvsilane (MPTMS). In conclusion, MoPA bonded CL-SPEEK composite membrane featured 0.129 S/cm of proton conductivity at $80^{\circ}C$, and 2,156 hours of chemical stability in Fenton test. These properties are better than those of membranes of other SPEEK system.

• 한국수소및신에너지학회논문집
• /
• 제27권5호
• /
• pp.478-484
• /
• 2016

Polyether ether ketone (PEEK) composite membranes have been intensively investigated for polymer electrolyte membrane water electrolysis (PEMWE). Covalently linked (CL) sulfonated polyether ether ketone (SPEEK) and cellulose polymer composite membranes were prepared and characterized. Polyether ether ketone (PEEK) and cellulose were sulfonated and then were covalently linked by 1,4-diiodobutane to produce covalently linked SPEEK and cellulose polymer composite membranes. The composite membranes showed better thermostability and electrochemical properties than SPEEK. The membranes were prepared by sol-gel casting method. CL-SPEEK/Cellulose composite membrane featured 0.2453 S/cm of proton conductivity at $80^{\circ}C$ which was better than that of Nafion.

• 한국신재생에너지학회:학술대회논문집
• /
• 한국신재생에너지학회 2010년도 추계학술대회 초록집
• /
• pp.85.2-85.2
• /
• 2010

There is widespread effort to develop polymer membranes in place of Nafion for high temperature polymer electrolyte membrane fuel cell(PEMFC). In our study, SiO2 membranes are arranged by electrospinning method. For impregnation solution, the modified sulfonated poly(ether ether ketone)(SPEEK) polymer is prepared from sulfonation, sulfochlorination, partial reduction and lithiation reaction. The modified polymer is cross-linked with 1,4-diiodobetane in NMP solvent and then blended with Heteropoly acid(HPA). The characterization of membranes is confimed by FT-IR, Thermogravimetry(TGA), water uptake test and single cell performance test for PEMFC, etc. The composite membrane shows satisfactory thermal and mechanical properties. Beside, The membrane exhibits good ion exchange capacity and high proton conductivity. As a result, The composite membrane is promising as an alternative membrane in high temperature PEMFC.

• 한국막학회:학술대회논문집
• /
• 한국막학회 1993년도 추계 총회 및 학술발표회
• /
• pp.32-33
• /
• 1993

근래 환경 문제의 중요성이 크게 대두되면서 여러 제조 공정에서 방출되는 폐수등을 처리하는데 막분리 공정을 이용하려는 연구가 진행되고 있다. 이 공정에 필요한 내구성, 내 미생물성, 내 약품성등이 우수한 역삼투막 재료를 얻기 위한 방법의 하나로 엔지니어링 플라스틱을 친수화 시키는 방법이 개발되어 왔는데, 구체적으로는 설폰화등의 친수화가 된 폴리설폰(polysulfone), 폴리 에테르 에테르 케톤(poly ether ether ketone), 폴리 이미드(polyimide) 수지등이 검토되고 있다. 특히 PPO(poly(2,6-dimethyl-1,4-phenylene oxide))로 만들어진 분리막은 내산화성이 우수하고 내구성이 뛰어나다고 알려져 있다. 본 연구에서는 PPO를 유기 금속 반응을 이용하여 carboxylation시키고 이 carboxylated PPO로 역삼투막을 제조하여 투과특성을 조사하였다.

• 공업화학
• /
• 제35권3호
• /
• pp.214-221
• /
• 2024

PEEK는 우수한 열안정성, 내화학성 및 높은 기계적 강도를 가져 분리막에서 많이 이용된다. 하지만 높은 용융온도로 인해 성형이 어렵고 적합한 용매를 찾기 어렵다는 단점을 지닌다. 따라서 본 연구에서는 기계적 강도와 화학적 안정성이 우수한 분리막을 제조하기 위하여 폴리에테르에테르케톤(polyether ether ketone, PEEK)과 벤조페논(diphenyl ketone, DPK)을 희석제로 사용하여 분리막을 제조하였다. 분리막은 PEEK의 단점을 보완하기 위해 열 유도 상분리법(thermally induced phase separation, TIPS)을 이용하여 분리막을 제조하였으며 이후 특성평가를 진행하였다. 먼저 분리막 제조 조건을 알아보기 위하여 고분자 함량에 따른 결정화 온도, cloud point를 이용하여 상평형도 작도를 하여 최적의 분리막 제조 조건을 확인하였다. 이후 전자주사현미경(scanning electron microscopy, SEM)을 통하여 고분자와 희석제의 함량에 따른 분리막의 모폴로지 변화를 확인하였고, 고분자 함량이 증가할수록 분리막의 두께가 증가하는 경향을 확인하였다. 분리막으로서 성능을 평가하기 위해 인장 강도와 DI-water 투과도 테스트를 진행하였다. 앞선 특성 평가를 통해 PEEK를 사용한 분리막의 우수한 기계적 강도와 투과성능을 확인하였다.

• 한국막학회:학술대회논문집
• /
• 한국막학회 2005년도 춘계 총회 및 학술발표회
• /
• pp.144-147
• /
• 2005