• 한국전기전자재료학회논문지
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• 제14권4호
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• pp.302-308
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• 2001

The polymers with various composition of 4-vinylpyridine (4-VP) with n-butyl acrylate (n-BA) and 2-hydroxypropyl methacrylate (HPMA) were synthesized as a humidity sensitive material and quaternized with 1.5-dibromopentane. Resistance versus relative humidity decreased with increase in the content of n-BA in the copolymer. The introduction of HPMA increased the resistance of the humidity sensor as well as enhanced the adherence to the alumina substrate. In the case of 4-VP/n-BA/HPMA=80/10.10, the hysteresis and temperature coefficient were $\pm$2%RH and -0.42∼0.46%RH/$\^{C}$. The average resistance at 30%RH, 60%RH and 90%RH are 3.1㏁, 155 ㏀ and 7.9 ㏀, respectively.

• 한국섬유공학회:학술대회논문집
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• 한국섬유공학회 1996년도 추계 학술발표회
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• pp.53-58
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• 1996

The Chitin Thiocarbonate-Fe(II)-H2O2 redox initiator system was investigated for the graft copolymerization of acrylonitrile(AN) and acrylic acid(AA) monomers onto chitin powder. The reactions with vinyl monomers onto chitin were carried out under various the graft copolymerization conditions to elucidate the polymerization behavior in terms of graft yield. Reactions of chitin-acrylonitrile graft copolymer with hydroxyl amine hydrochloride and those with sodium hydroxide were conducted in order to obtain chitin-(amidoxime-co-acrylonitrile) and chitin-(acrylate-co-acrylamide) graft copolymers, respectively. The reaction efficiency was observed to depend on the alkali concentration, time, temperature, and the reactant concentrations. The prepared chitin derivatives were evaluated to find potential applications for use in wastewater treatments for adsorption and desorption of heavy metal ions as well as acidic and basic dyes.

• 폴리머
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• 제30권3호
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• pp.230-237
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• 2006

단량체로 methyl methacrylate, n-butyl acrylate, 2-hydroxyethyl acrylate와 도막물성 향상 및 가교밀도를 극대화시켜 줄 관능성 단량체인 acetoacetoxyethyl methacrylate (AAEM)를 반응시켜 4원공중합체인 고형분 80%의 아크릴수지 (HSA-98-20, HSA-98-0, HSA-98+20)를 합성하였다. AAEM 성분이 함유된 아크릴수지의 점성도는 $1420\sim5760cps$, 수평균분자량 $2080\sim2300g/mol$, 다분산도 $2.07\sim2.19$ 및 전환율 $88\sim93%$이었다. 고형분 80%인 아크릴수지와 이소시아네이트 경화제를 상온에서 경화시켜 하이솔리드 도료(HSA-98-20C, HSA-98-0C, HSA-98+20C)를 제조하고 도막시편을 제작하여 각종 물성 시험을 수행한 결과, 제조된 하이솔리드 도료내에 AAEM 도입 전후의 도막물성이 비교실험에서 AAEM 도입후에 내마모성과 내용제성이 증진됨으로써 자동차 상도용 도료에의 적용이 가능케 되었다. 또한 점탄성 측정에 의한 도막의 경화거동에서 HSA-98+20C > HSA-98-0C > HSA-98-20C의 순서로 경화가 빨리 진행됨으로써, 유리 전이 온도 값의 증가함에 따라 경화속도가 빨라짐을 알 수 있었다.

• 청정기술
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• 제18권4호
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• pp.366-372
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• 2012

펜던트기가 tris(8-hydroxyquinoline) aluminum ($AlQ_3$)으로 된 아크릴 단량체(HEMA-p-$AlQ_3$) (HEMA = 2-hydroxyethyl methacrylate)를 각각 메틸메타크릴레이트(MMA), 아크릴로니트릴(AN), 순수 HEMA와 공중합하여 3가지 아크릴 공중합체[MMA-co-HEMA-p-$AlQ_3$ (공중합체 1), AN-co-HEMA-p-$AlQ_3$ (공중합체 2), HEMA-co-HEMA-p-$AlQ_3$ (공중합체 3)]를 라디칼 공중합법으로 합성하였다. 25 wt%의 HEMA-p-$AlQ_3$를 함유한 공중합체 1,2,3의 유리전이온도($T_g$)는 각각 158, 150, $126^{\circ}C$로 나타났으며, 이는 유기발광다이오드(organic light emitting diodes, OLED)로써 지녀야 하는 우수한 열 안정성을 만족하였다. 그리고 이들 공중합체는 테트라하이드로퓨린, 디메틸포름아미드, 톨루엔 및 클로로포름 등과 같은 용매에 잘 용해되었으며, 자외선-가시광선의 흡수 및 발광 거동이 순수 $AlQ_3$와 거의 동일함을 알 수 있었다. 또한 이들 공중합체를 스핀 코팅하여 녹색의 OLED 디바이스를 제조한 후 전류 밀도-전압 곡선을 비교하였다. 공중합체 3을 사용한 OLED 디바이스의 on-set 전압은 약 2 볼트로써 다른 두 공중합체 OLED 디바이스의 전압(공중합체 1: 약 3 볼트, 공중합체 2: 약 4 볼트) 보다 낮음을 알 수 있었다.

• 폴리머
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• 제29권5호
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• pp.433-439
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• 2005

내구발수성 고분자를 얻기 위해 불소화 알킬아크릴레이트-스테아릴아크릴레이트-m-이소프로페닐-$\alpha,\;alpha$-디메틸벤질 이소시아네이트(TMI)를 유화중합시켜 불소화 알킬기와 이소시아네이트기를 가지는 공중합체를 제조하였다. 3 단량체의 공중합속도는 비이온 유화제 및 비이온-양이온 혼합 유화제의 사용에 따라 상당히 의존하였고 그 최적조건을 얻었다. 공중합체의 입자크기는 105에서 222nm의 범위에 있었고 비이온-양이온의 혼합 유화제에 의해 만들어진 공중합체가 비이온 유화제로 만들어진 공중합체보다 입자가 작았다. 나일론과 면의 모델 화합물로 N-메틸아세트아미드와 셀로비오스 각각과 TMI는 반응하지 않았다. 반면에 TMI와 부틸아민은 실온에서 반응하였다. 혼합 유화제에 의해 제조된 공중합체를 코팅한 나일론과 PET 천에 대한 세탁 전후의 물의 접촉각은 $139^{\circ}$와 $133^{\circ}$ 정도였다. 따라서 공중합체의 내구발수성은 우수하였다

• 한국응용과학기술학회지
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• 제22권4호
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• pp.362-370
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• 2005

Copolymers (HSA-98-20, HSA-98-0, HSA-98+20) which are acrylic resin containing 80% solid content were synthesized by the reaction of monomers, including methyl methacrylate, n-butyl acrylate, and 2-hydroxyethyl acrylate with a functional monomer, such as acetoacetoxyethyl methacrylate (AAEM), which may improve in cross-linking density and physical properties of films. The physical properties of prepared acrylic resins, containing AAEM, are as follows : viscosity, $1420{\sim}5760cps$ ; number average molecular weight, $2080{\sim}2300$ ; polydispersity index, $2.07{\sim}2.19$ ; conversions, $88{\sim}93%$, respectively. To prepare acryl resins, four kinds of initiators including ${\alpha},{\alpha}'-azobisisobutyronitirile$ (AIBN), di-tert-butyl peroxide (DTBP), t-amylperoxy-2-ethyl hexanoate (APEH), benzoyl peroxide (BPO) were used. The viscosity of the acrylic resins prepared with these initiators was increased in the order of DTBP>APEH>AIBN>BPO. APEH was proved as a suitable initiator in this study. Shear rates of acrylic resins were constant in respect to viscosity. From these results, it would appear that the resins have Newtonian flow characteristics and good workability.

• 대한화학회지
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• 제59권2호
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• pp.142-147
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• 2015

Two new chitosan derivatives, polyamine grafted chitosan copolymers have been synthesized for corrosion protection of carbon steel in acidic medium. First, methyl acrylate graft chitosan copolymer (CS-MAA) was prepared by the reaction of chitosan (CS) and methyl acrylate (MAA) via the Michael addition reaction. Then, CS-MAA was reacted with ethylene diamine (EN) and triethylene tetramine (TN) respectively to synthesize ethylene diamine grafted chitosan copolymer (CS-MAA-EN) and triethylene tetramine grafted chitosan copolymer (CS-MAA-TN), and the structures were characterized by Fourier-transform infrared spectroscopy (FT-IR). At last, the corrosion inhibition activities on Q235 carbon steel were investigated by using gravimetric measurements, metallographic microscope, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) measurements. The compounds CS-MAA-EN and CS-MAA-TN show an appreciable corrosion inhibition property against corrosion of Q235 carbon steel in 5% HCl solution at $25^{\circ}C$. It has been observed that CS-MAA-EN shows greater corrosion inhibition efficiency than CS-MAA-TN. The inhibition efficiency of CS-MAA-EN was close to 90% when the mass fraction concentration was 0.2%~0.3%; the inhibition efficiency of CS-MAA-TN was close to 85% when the mass fraction concentration was 0.02%. The present work provided very promising results in the preparation of green corrosion inhibitors.

• 폴리머
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• 제39권3호
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• pp.403-411
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• 2015

A series of hydrophobically associating fluorinated amphiphilic polyacrylamide copolymers with remarkably high heat resistance and salt tolerance were synthesized by free radical micellar copolymerization, using acrylamide (AM) and sodium 2-acrylamido-tetradecane sulfonate ($AMC_{14}S$) as amphiphilic monomers, and 2-(perfluorooctyl) ethyl acrylate (PFHEA) as hydrophobic monomer. The structure of the terpolymer was characterized by FTIR, $^1H$ NMR and $^{19}F$ NMR. The solution properties of the terpolymers were investigated in details, and the results showed that the terpolymer solution had strong intermolecular hydrophobic association as the concentration exceeded the critical association concentration 1.5 g/L. The terpolymer solution possessed high surface activity, viscoelasticity, excellent heat resistance, salt tolerance and shearing resistance. The viscosity retention rate of copolymer solution was as high as 59.9% under the condition of fresh wastewater, $85^{\circ}C$ and a 60-days aging test.

• 폴리머
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• 제31권3호
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• pp.255-262
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• 2007

고분자 습도센서 막으로 사용하기 위한 두 가지 타입의 공중합체를 라디칼 중합방식에 의하여 제조하였다. 각각 공중합체는 세 가지의 단량체를 포함하여 제조하였는데, 각 단량체들은 습도 저항성, 막 안정성, 유연성, 임피던스 및 전극 부착력을 증대시키는 효과를 가지도록 하였다. 염 형태의 MDBAB는 제조된 습도 막의 임피던스를 감소시키는 효과를 보였으며 아민과 반응하여 가교 구조를 생성하였다. DAEMA, 4-VP, 및 2-EHA를 사용하여 습도막 제조를 위하여 몇 가지 조성물을 제조하였다. 특정 조성 조건에서 성능 및 장기 내구성 측면에서 우수한 결과를 얻을 수 있었다.

• 한국응용과학기술학회지
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• 제25권1호
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• pp.1-14
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• 2008

To prepare weather-resistant modified silane acrylic resin coatings for an architectural purpose, tetrapolymers were synthesized by radical polymerization. 3-Methacryloxypropyltrimethoxysilane (MPTS) as a silicone monomer and n-butyl acrylate, methyl methacrylate, and n-butyl methacrylate as acrylic monomers were used. The composition of monomers was adjusted to fix the glass transition temperature of acrylic polymer for $20^{\circ}C$. The composition of MPTS in the synthesized polymer were varied from 10 wt% to 30 wt%. On the basis of synthesized resin amber paints were prepared and their physical properties and effects on weatherability were examined. The presence of MPTS in modified silane acrylic resins generally resulted in low molecular weight and broad molecular weight distribution, and also lowered the viscosity of the copolymers. The coated films prepared from these resins showed good and balanced properties in general. Adhesion to the substrate was outstanding in particular. Weatherability tests were carried out in three different types such as outdoor exposure, QUV, and SWO. The test results showed that the modified silane acrylic resins containing 30 wt% of MPTS had superior weathering properties.