• The International Journal of Costume Culture
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• 제6권2호
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• pp.134-146
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• 2003

Polyester of linear homopolymer poly(ethylene terephthalate)(PET) was chemically modified through the formation of branched copolymer to improve the undesirable properties of fiber. Photo-induced graft copolymerization of the acrylic monomers acrylic acid (AA) and methyl acrylate (MA) in the liquid and vapor phase, respectively, onto N,N-dimetylformamide (DMF)-pretreated PET fibers was carried out. The effect of various synthesis conditions and DMF pretreatment of the PET on the graft yield was investigated. Grafting mechanism was analysed. The grafting was promoted by increasing DMF pretreatment temperature and amount of DMF retention in the fiber. The increasing biacetyl and monomer flow time, and irradiation time enhanced the grafting up to a certain amount and thereafter it decreased.

• 한국고분자학회:학술대회논문집
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• 한국고분자학회 2006년도 IUPAC International Symposium on Advanced Polymers for Emerging Technologies
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• pp.329-329
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• 2006

Various new active ester monomers based on (meth)acrylates and 4-vinylbenzoic acid have been prepared. Investigation of the controlled radical polymerization behavior of the respective monomers resulted in excellent polymerization control, thus, opening synthetic routes to reactive block copolymers. Polymer analogous reactions with amines yielded functional polymers. In the case of the copolymer poly(N-isopropylacrylamide-co-acetone oxime acrylate) a lower critical solution temperature could be measured at $52^{\circ}C$. Thus, the reactive copolymer features two characters: reactive AND stimuliresponsive behavior.

• 한국고분자학회:학술대회논문집
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• 한국고분자학회 2006년도 IUPAC International Symposium on Advanced Polymers for Emerging Technologies
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• pp.358-358
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• 2006

The graft copolymerization of methyl methacrylate (MMA), butyl acrylate (BA) and acrylamide (AAm) onto oil palm empty fruit bunch (OPEFB) fiber were successfully carried out in aqueous solution using $H_{2}O_{2}/Fe^{2+}$ as initiator. For all monomers the percentage of grafting increases with the amount of monomer and can be controlled by setting the appropriate reaction conditions. The optimum reaction period were found to be 120 minutes for all monomers whereas the optimum temperature and the amount of initiator needed for grafting depend on the type of the monomer used. The mechanisms of grafting vinyl monomer onto OPEFB were proposed. The grafted products were characterized by gravimetric analysis, FTIR and SEM.

• 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.

• Elastomers and Composites
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• 제29권5호
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• pp.444-452
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• 1994

Emulsion graft copolymerizations of vinyl monomers, butyl acrylate(BA), methyl methacrylate(MMA), 2-ethylhexyl acrylate (EHA), glycidyl methacrylate (GMA), 2-hydroxyethyl methacrylate(HEMA), methacrylonitrile(MAN), dimethylaminoethyl methacrylate(DAMA) or 2-vinyl pyridine(VP), onto carboxyl-terminated SBR latex were carried out under different experimental conditions. In case of synthesizing SBR-g-poly(butyl acrylate), the degree of grafting was increased with increasing the amount of emulsifier, polymerization temperature and the amount of initiator. Pull-out strength of resorcinol-formaldehyde-latex(RFL) adhesives formulated with modified latexes was very higher than that of RFL adhesive formulated with ungrafted latex. When the modified latexes with GMA, HEMA, MAN, DAMA or VP were used, the break occurred at cords. Peel strength of RFL adhesives formulated with SBR-g-poly(GMA), SBR-g-poly(HEMA) or SBR-g-poly(VP) was higher by about 1.3 times than that of RFL adhesives formulated with unmodified SBR against nylon cord and was higher by about 2.0 times against polyester cord.

• Macromolecular Research
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• 제16권7호
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• pp.614-619
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• 2008

Copolymers of phenyl alkyl acrylates/methacrylates are used clinically as soft materials for the foldable intraocular lens (IOL) to treat cataracts. In this study, copolymers of 2-phenylethyl acrylate (PEA) and 2-phenylethyl methacrylate (PEMA) of various compositions were prepared using free radical polymerization in solution. The composition of the copolymers was determined by $^1H$-NMR analysis. The reactivity ratios of the monomers were calculated using the conventional Fineman-Ross or Kelen-Tudos method. The reactivity ratio of PEA ($r_1$) and PEMA ($r_2$) were estimated to be 0.280 and 2.085 using the Kelen-Tudos method, respectively. These values suggest that PEMA is more reactive in copolymerization than PEA, and the copolymers will have a higher content of PEMA units. The glass transition temperature ($T_g$) of the copolymers increased with increasing PEMA content. The molecular weight and polydispersity indices ($M_w/M_n$) of the polymers were determined by GPC. Overall, these results are expected to be quite useful in applications to foldable soft IOL materials.

• Elastomers and Composites
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• 제49권3호
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• pp.245-252
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• 2014

폴리올, 이소시아네이트, 2-HEMA 및 기타 아크릴레이트 단량체들로부터 제조된 폴리우레탄 접착제의 FT-IR측정과 물성을 검토하였다. 폴리우레탄 접착제의 연화점, 점도, 접착강도 및 기계적 물성들이 각각 링과볼법, Brookfield 점도계 및 만능시험기를 이용하여 검토되었다. 실험 결과에 의하면 PPG 함량 및 부틸아크릴레이트 함량이 증가함에 따라 연화점, 접착강도, 인장강도 및 100% modulus 값 등은 감소하는 것을 보여준다. 하지만 2-HEMA 및 MDI량이 증가할수록 인장강도 및 100% modulus값 등은 증가하였으며 점도와 NCO함량 등도 또한 증가하였다.

• 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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• 제35권2호
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• pp.502-508
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• 2018

코팅, 발수 및 접착특성이 우수한 불소함유 아크릴계 공중합체를 설계, 제조하였다. 공중합체용 모노머로 methyl methacrylate(MMA), 2,2,2-trifluoroethyl acrylate(FMA) 그리고 2-hydroxyethyl methacrylate(HEMA)를 사용하여 괴상 중합 및 유화 중합으로 반응하여 > 95 %이상 고수율로 공중합체를 제조하였다. $^1H-NMR$로 화학구조를 확인하였고 DSC와 DMA로 물성분석을 한 결과, FMA의 함량이 5 %에서 10 %로 증가함에 따라 유리전이온도는 $3^{\circ}C$ 감소하였으며 HEMA의 경우에는 감소폭이 $2{\sim}8^{\circ}C$로 나타났다. Instron 및 TGA를 이용한 분석에서는 FMA 혹은 HEMA 함량이 10 % 증가함에 따라 괴상 및 유화 중합체 모두에서 인장강도는 29 MPa에서 22 MPa로 감소하였고 Td는 $200^{\circ}C$에서 $180^{\circ}C$로 감소하는 경향을 나타내었다. 접촉각은 친수성인 HEMA의 함량이 증가함에 따라 상대적으로 감소하였다.

• 폴리머
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• 제39권2호
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• pp.191-199
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• 2015

대표적인 범용 플라스틱인 폴리스티렌의 장점인 투명성을 유지하면서 단점인 낮은 내충격성을 보완하고자 투명한 아크릴레이트계 고분자의 단량체인 butyl acrylate(BA)와 methyl methacrylate(MMA)를 styrene(SM) 단량체와 현탁중합으로 중합하여 3원 공중합체를 제조하였다. SM/BA 2원 공중합체와 SM/BA/MMA 3원 공중합체를 제조하여 각각의 물성을 비교하였다. 또한 가장 충격강도가 좋은 3원 공중합체에 가교제인 dicumyl peroxide(DCP)의 함량을 변화시키면서 가교반응시켰다. 단량체의 중합조성비 및 가교제의 함량이 공중합체의 열적, 기계적 물성과 광학적 특성에 미치는 영향에 대해 확인하였다. 결론적으로 butyl acrylate의 함량이 증가할수록 충격강도는 높아지지만 SM/BA 2원 공중합체는 특정 조성에서 불투명하게 된다. 하지만, SM/BA/MMA 3원 공중합체는 모든 조성에서 투명하면서 비교적 높은 기계적 물성을 나타내었다. 또한 DCP의 함량이 증가할수록 기계적 물성을 높일 수 있었으나 투명성은 점차 낮아졌다.