• 공업화학
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• 제8권2호
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• pp.276-285
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• 1997

역삼투복합막의 박막으로 사용되고 있는 polyamide의 성능을 용질투과방식과 연관하여 이론적으로 고려하고 단량체 및 제조 조건을 변화시켜 계면중합을 통해 제조하여 봄으로써 이의 검증을 시도하였다. 제조된 고분자는 중합조건에 따라 물질 구성의 변화를 보여 주었으며, 이는 이론적으로 제시한 값의 범주에 속하였다. 또한 이에 따라 막성능에서도 큰 영향을 발휘한 바, 용매의 변화, 수용상 및 유기상 단량체의 농도 비율에 따라 고분자의 함유성분의 변화를 가져왔다.

• 한국막학회:학술대회논문집
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• 한국막학회 1995년도 추계 총회 및 학술발표회
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• pp.54-55
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• 1995

현재 수처리용 분리막으로 널리 사용되고 있는 상업용 polyamide membrane은 주사슬을 이루고 있는 amide bond가 chlorine에 쉽게 분해됨으로써 주쇄의 절단이 일어나므로 막이 파괴되는 결과를 초래하여 역삼투 분리막의 기능이 저하되는 문제점을 갖고 있다. 또한 분리막의 성능으로써 수투과도의 향상도 기존의 분리막의 개선점으로 지적되고 있다. 본 연구에서는 재료 자체의 친수성이 강한 hydroxyl group을 가진 vinyl계 화합물을 기존의 amine계 monomer와 혼합하여 가교반응을 시킴으로써 전체적인 분리막의 수투과도 및 내염소성의 향상을 도모하였다. 기존의 polyamide 분리막의 소재인 1,3-phenylenediamine(MPDA)에 친수성기인 hydroxyethylmethacrylate(HEMA) monomer를 첨가하고 가교제인 trymesoyl chloride(TMC)로 이를 가교시켜 HEMA 및 PVA의 친수성에 의한 수투과도 및 내염소성의 향상을 유도하여 보았다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1996년도 추계학술대회 논문집
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• pp.125-127
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• 1996

This paper deals with the fabrication of 4 poles anisotropic Sr·ferrite plastic magnets. After Polyamide6 and polyamlde12 are kneaded respectively with Sr·ferrite powder, silane coupling and calcium stearate of lwt% are added for coating and pelleting. The pelleted specimen are injection-moulded under the magnetic field using 4 poles mould. For 4 poles anisotropic Sr·ferrite plastic magnets with polyamide6 as a binder, the surface magnetic flux density distribution is +943.8∼-943.87kG and the deviation is 5.2%, where as with polyamide12, the distribution is +1040.9∼-1040.9kG and the deviation is 5.4%. It shows that both of the magnet distributions are stable. As the results of the experiments, we find 4 poles anisotropic Sr·ferrite magnets have good properties as the materials appropriate for manufacturing magnet type synchronous motors.

• Korean Membrane Journal
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• 제4권1호
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• pp.12-19
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• 2002

Nanofiltration of aqueous dye solutions was carried out using polyamide (PA) nanofiltration (NF) composite membranes. The PA composite membranes were prepared by the interfacial polymerization of piperazine (PIP) and trimesoyl chloride (TMC) on the surface of microporous polysulfone (PSf) ultrafi1tration (UF) membranes. After characterization in terms of their permeation performance and surface ionic property, they were used for the separation of dye solutions such as Direct Red 75, 80, 81, and Direct Yellow 8 and 27. The separation conditions were varied to study the factors affecting on the permeation performance of the membranes: different concentrations of dye solutions, operating temperature and time, and flow rate of a feed solution. The surface property of the membrane, especially its ionic property, as a function of operating time was examined with a zeta-potentiometer and the relationship between the surface chemistry of the membrane and its permeation properties was also studied.

• Fibers and Polymers
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• 제1권2호
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• pp.111-115
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• 2000

The effects of nitrile group substitution onto aromatic polyamide backbone on the gas permeability and permselectivity of the polymers are examined. The gas permeability of aromatic polyamides increase with increasing the content of nitrile group substitution, whereas the permselectivity decreases with increasing the nitrile group contents. The effects of chain linrearity on the permeability and permselectivity are also examined. The non-linearity of the polymers increases the permeability. These behaviors are interpreted in terms of chain packing and crystallinity of the aromatic polyamides.

• Elastomers and Composites
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• 제50권3호
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• pp.205-209
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• 2015

Magnesium oxide (MgO) reinforced polyamide-66 (PA66) composites were prepared through melt-compounding method in order to determine the possibility of using MgO particle as conductive filler in the polymer-based composite. The effects of MgO filler content on the thermal conductivity and mechanical properties for the PA66/MgO composites were investigated. The results showed that the addition of MgO filler to the PA66 matrix led to a large increase in thermal conductivity of the PA66/MgO composites. Tensile strengths of the PA66/MgO composites were slightly decreased as MgO filler loading increased. However, flexural strength and flexural modulus were improved with increasing filler loading. Notched Izod impact strengths were dramatically lowered by the addition of MgO filler.

• Elastomers and Composites
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• 제55권1호
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• pp.1-5
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• 2020

This study examined the effects of the addition of maleic anhydride-grafted polypropylene (PP-g-MA) and polyolefin elastomer (POE) on polyamide 66 (PA66) and polypropylene (PP) blends. The blends of PA66/PP with PP-g-MA and POE were prepared using a twin screw extruder. Mechanical testing results revealed that the tensile, flexural, and izod impact strengths of the blends were maximized at a PP-g-MA content of 2 phr. The increased mechanical strength of the blends with PP-g-MA was attributed to the compatibilizing effect of the PA66 and PP blends. In addition, as the POE content increased, the impact strength of the blends increased. However, at a high POE content, the tensile and flexural strengths decreased, seemingly because of the lower mechanical properties of POE.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2003년도 추계학술대회 논문집 Vol.16
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• pp.235-238
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• 2003

Thermo-plastic has generally bad electrical characteristics at high temperature comparing to thermoset-plastics when the plastic apply to electrical power apparatus as an electrical insulator. To solve the problem, we study engineering plastics such as Polyamide and Polyphthalamide as a base resin. And filler of the engineering plastics is glass fiber. Electrical characteristics studied are permittivity, loss factor and breakdown strength according to temperature and frequency of measuring signal. Electrical characteristics of Polyphthalamide has good temperature and frequency dependency comparing to those of Polyamide.

• Membrane and Water Treatment
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• 제10권6호
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• pp.431-440
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• 2019

A novel composite membrane was synthesized using crosslinked polyamide and fly ash ceramic substrate for phenol removal. Glutaraldehyde was used as crosslinker. Characterization shows that synthesized membrane possesses good permeability ($0.184l.m^{-2}.h^{-1}.kPa^{-1}$), MWCO (1.7 kDa), average pore size (1.08 nm) and good chemical stability. RSM was adopted for phenol removal studies. Box-Behnken-Design using quadratic model was chosen for three operating parameters (feed phenol concentration, pH and applied pressure) against two responses (phenol removal, flux). ANOVA shows that model is statistically valid with high coefficient of determination ($R^2$)value for flux (0.9897) and phenol removal (0.9302). The optimum conditions are obtained as pH 2, $46mg.l^{-1}$ (feed phenol concentration) and 483 kPa (applied pressure) with 92.3% phenol removal and $9.2l.m^{-2}.h^{-1}$ flux. Data validation with deviation of 4% confirms the suitability of model. Obtained results reveal that prepared composite membrane can efficiently separate phenol from aqueous solution.

• 멤브레인
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• 제26권4호
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• pp.281-290
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• 2016

정삼투 분리막 용도에 적합한 폴리아미드 복합막의 제조에 있어 지지층의 극성 및 공극률이 폴리아미드 구조 및 정삼투 분리막 투과 성능에 미치는 영향을 살펴보기 위하여 클레쏘킬레이트 금속착물(0.1-0.5중량%)이 함유된 폴리술폰(18중량%) 용액을 상전이 공정을 통하여 지지층을 제조하였다. 제조된 지지층 상에 방향족 폴리아미드 활성층을 제막하였다. 다공성 PSF 지지층 제조를 위하여 상대적으로 낮은 폴리술폰(12중량%) 용액을 이용한 지지층을 폴리에스터 필름상에서 제조한 후 필름을 제거하고 제조된 지지층 상에 방향족 폴리아미드 활성층을 제막하였다. 제막된 시편 중 폴리술폰(18중량%)/금속착물(0.5중량%)로 만들어진 FO막은 유량 9.99 LMH, reverse salt flux 0.77 GMH로 HTI의 상용막(10.97 LMH, 2.2 GMH)과 비교해도 거의 비슷한 유량값과 향상된 RSF 값을 얻을 수 있었다. 캐스팅 용액의 금속착물의 첨가로 활성층 두께가 줄어들었으나 제거효율은 향상되는 결과를 얻을 수 있었다.