• 접착 및 계면
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• 제1권1호
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• pp.23-29
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• 2000

소수성 고분자 재료 표면의 친수화 처리 및 기능성 작용기 도입은 재료의 응용성을 상당히 확장할 수가 있기 때문에 중요성이 인지되고 있다. 본 연구에서는 기상 UV 그라프트 반응(vapor phase photografting)에 의해 서로 다른 이온성을 가지는 비닐계 단량체들을 PE 표면에 도입하여 표면 친수성을 향상시켰다. 이를 위해 acrylic acid(음이온성), acrylamide(중성), allylalcohol(중성), allylamine(양이온성) N,N-dimethyl aminopropyl acrylamide(양이온성) 등 서로 다른 기능성 작용기를 갖는 친수성 단량체들을 본 실험실에서 고안한 기상 UV 그라프트 반응장치를 이용하여 기체상태에서 PE 표면에 도입하였다. 이들 단량체들이 도입된 PE 표면을 물 접촉각 측정과 ATR-FTIR을 이용하여 분석한 결과, 각 기능성 단량체들이 효과적으로 PE 표면에 그라프트되어 표면의 친수성이 향상되었음을 확인할 수 있었다. 본 연구에 사용한 기상 UV 그라프트 반응은 고분자 표면에 다양한 작용기를 도입하여 표면을 개질할 수 있는 효과적인 방법으로 생각되어진다.

• 한국응용과학기술학회지
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• 제24권1호
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• pp.10-22
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• 2007

To prepare weather-resistant silicone/acrylic resin coatings for an architectural purpose, tetrapolymers were synthesized by a 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 compositions of monomers were 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 for weatherability were examined. The presence of MPTS in silicone/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 silicone/acrylic resins containing 30 wt% of MPTS had weather-resistant properties.

• Elastomers and Composites
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• 제57권2호
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• pp.29-39
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• 2022

In this research, the relationships between the chemical structures of 10 different acrylate monomers with 3 different cross-linking monomers were evaluated. The thermal stabilities of the prepared copolymers were evaluated by their weight-loss percentage through thermogravimetric analysis, and their glass-transition temperatures were analyzed using differential scanning calorimetry. Based on the results, some relationships between the chemical structures of the monomers and their properties were derived and are discussed herein.

• 공업화학
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• 제3권4호
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• pp.678-685
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• 1992

기능성 단량체가 점착물성에 미치는 영향을 알아보기 위하여 아크릴산과 기타 단량체로 아크릴 수지를 라디칼 용액중합을 이용하여 4원공중합시킨 후 물성을 측정하였으며, 또한 최적 점착 물성을 얻기 위하여 통계적 분석 방법을 이용하여 검토하였다. 점착물성에 있어서 아크릴산이 아크릴아미드보다 점착력의 증가에 미치는 영향이 컸다. 반면에 tackiness의 감소에 있어서는 아크릴아미드의 영향이 아크릴산 보다 컸다. 통계적 방법을 인용하여 점착물성 중 점착력, tackiness 그리고 응집력을 최적화 시킨 결과 단량체의 성분 비율은 부틸 아크릴레이트 81.7 mole%, 아크릴산 8.0 mole%, 아크릴아미드 2.1 mole%, 비닐아세테이트 8.2 mole% 일 때로 나타났고 이 때의 추정 회귀식은 다음과 같았다. $D=.857+.072X_1-.114X_2-.027X_3-.126X_1{^2}-.046X_1{\cdot}X_2-.063X_1{\cdot}X_3-.152X_2{^2}+.027X2{\cdot}X_3-.120X_3{^2}$ $X_1$:coded acylic acid, $X_2$:coded acylamide, $X_3$:coded vinylacetate

• Macromolecular Research
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• 제16권2호
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• pp.128-133
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• 2008

Several dual-curable acrylic pressure-sensitive adhesives (PSA) were synthesized by the radical polymerization of acrylic monomers containing benzophenone, hydroxyl, and alkyl groups. The optimum extent of UV-induced cure was determined by varying the content of the benzophenone groups (the photoinitiator) from 0.5 to 1.5 wt%. The weight average molecular weight of the polymers obtained ranged from 300,000 to 700,000 amu. The coated pressure-sensitive adhesives were cured either by short UV exposure to induce the grafting of acrylic polymers, or by heating for 6 hat $60^{\circ}C$ to promote the reactions between the polyisocyanates and hydroxyl groups. The dual-curing behavior was determined by monitoring both processes quantitatively by infrared spectroscopy. The developed dual-curable acrylic pressure-sensitive adhesives were found to compensate for the limitations in UV-induced curing of thick coatings.

• Macromolecular Research
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• 제17권11호
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• pp.879-885
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• 2009

A macroazoinitiator (MAI) containing a poly(ethylene glycol) (PEG) segment was intercalated in the gallery of sodium montmorillonite (Na-MMT). Acrylic monomers were polymerized using this MAI intercalated in Na-MMT to prepare the acrylic copolymer nanocomposite (AN), which is a multiblock copolymer composed of two segments, an acrylic copolymer and PEG intercalated in Na-MMT (Na-MMT/PEG). When AN was used to modify the reactive hot melt polyurethane adhesive (RHA), the acrylic copolymer segment and Na-MMT/PEG synergistically enhanced the initial bond strength evolution and reduced the set time, even when the amount of Na-MMT in RHA was < 1 wt%. The viscosity of RHA increased and the tensile properties of the cured RHA film decreased due to modification with AN. These variations were more evident as the Na-MMT content in AN was increased.

• 한국응용과학기술학회지
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• 제22권2호
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• pp.191-199
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• 2005

Removable protective adhesives for automobiles were synthesized by an emulsion polymerization of monomers such as n-butyl acrylate (BA), n-butyl methacrylate (BMA), acrylonitrile (AN), acrylic acid (AA) and 2-hydroxyethyl methacrylate (2-HEMA), in which AA and 2-HEMA were functional monomers. Potassium persulfate (KPS) was used as an initiator and sodium lauryl sulfate (SLS) was used as an emulsifier, and polyvinyl alcohol (PVA) was used as a stabilizer. Emulsion polymerization was carried out in a semi-batch type reactor. Tensile strength, extension, peel strength, viscosity and solid content of the synthesized adhesives were tested. The optimum physical properties of the removable protective adhesives for automobiles were obtained with the composition of 0.43 mole BA, 0.57 mole AN, 0.21 mole BMA, 0.03 mole AA, and 0.03 mole 2-HEMA.

• Elastomers and Composites
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• 제47권1호
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• pp.75-81
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• 2012

주단량체로 에틸 아크릴레이트, 부틸 아크릴레이트, 메톡시에틸 아크릴레이트, 가교 단량체로 글리시딜 메타아크릴레이트를 유화중합하여 아크릴고무를 제조한 후, 가교제로써 2,2-bis[4-(4-aminophenoxy)phenyl]propane를 첨가하여 고무컴파운드를 제조하였다. 주단량체의 조성에서 에틸 아크릴레이트의 함량이 증가하면 내열성이 증가하는 경향을 보였는데 이는 아크릴고무의 유리전이온도가 감소되었기 때문이다. 또한 에틸 아크릴레이트의 에스테르 그룹 농도가 3개의 주단량체 중 가장 높기 때문에 에틸 아크릴레이트 함량이 증가할수록 내유성이 향상되었다. 2,2-Bis[4-(4-aminophenoxy)phenyl]propane의 함유량에 따른 영향은 2 phr 첨가까지 인장강도와 신장율은 증가하지만, 그 이상의 첨가에서는 가교밀도의 증가에 따른 점성과 탄성이 감소하여 그 값들이 감소하였다.

• Korean Chemical Engineering Research
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• 제50권4호
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• pp.632-638
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• 2012

Isophorone diisocyanate (IPDI), polycarbonate diol (PCD), dimethylol propionic acid (DMPA)를 출발물질로 하여 수분산 폴리우레탄(waterborne polyurethane dispersion, PUD)을 합성하였다. 이 PUD에 아크릴 단량체인 HEMA (2-hydroxyethyl methacrylate)와 MMA (methyl methacrylate)의 혼합물을 첨가하여 수분산 폴리우레탄-아크릴 혼성 용액을 제조하였다. 그 결과 제조된 혼성 용액의 평균 입도는 아크릴 단량체의 첨가량이 증가함에 따라 증가하였다. 또한 수분산 폴리우레탄-아크릴 혼성 용액으로부터 제조된 코팅 도막의 내마모성과 내화학성은 순수한 PUD 보다 크게 향상되었다.

• 한국응용과학기술학회지
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• 제28권1호
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• pp.35-47
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• 2011

For the synthesis of water soluble acrylic modified epoxyester resin, fatty acid/epoxy ratio of 50/50 was used, and introduced maleic anhydride. Ratio of styrene/acrylic acid of acrylic monomers was fixed 85/15 and ratio of epoxyester/acrylic monomer was controlled 80/20, 75/25, 70/30, 65/35, and degree of neutralization were changed 65%, 80%, to 100%. As a result, 40% solids acrylic modified epoxyester resins were synthesized. Resins were evaluated water soluble stability, drying time, water resistant, storage stability and physical properties. And the white paints were prepared, and were evaluated viscosity, drying time, water resistance, adhesion, sagging, spray workability, gloss, salt spray resistance, skinning, whiteness and flash rust. As a result, the degree of neutralization of 100% and the ratio of epoxyester/acrylic monomer of 75/25 showed the best properties.