• 폴리머
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• 제25권2호
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• pp.226-232
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• 2001

The properties of poly(ethylene terephthalate) (PET)/maleic anhydride-grafted polypropylene (MAgPP)/poly(styrene-co-maleic anhydride)(PScMA) ternary blend were investigated. The ternary blend was immiscible based on the glass transition temperatures measured by dynamic mechanical analyzer (DMA). The degradation of MAgPP during melt mixing for 30 min at 280$^{\circ}C$ did not affect the properties of the ternary blend. The interaction among the components was confirmed from the rheological properties, which was increased with the PSCMA contents. In terms of the mechanical properties, it was observed to satisfy the mixture rule for a multiple system.

• Elastomers and Composites
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• 제41권1호
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• pp.10-18
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• 2006

Maleic anhydride로 처리된 저분자량 폴리부타디엔 (액상 PB)이 실리카로 보강된 SBR 배합물의 특성에 미치는 영향을 연구하였다. 실리카 분산은 액상 PB의 첨가에 의해 향상되었다. Maleic anhydride가 포함된 액상 PB가 maleic anhydride가 포함되지 않은 액상 PB보다 실리카 분산성 향상에 더 효과적임을 알 수 있었다. SBR 배합물의 점도는 액상 PB가 첨가됨에 따라 감소하였다. 가교밀도는 액상 PB의 함량이 증가함에 따라 감소하였고 가황 속도는 느려졌다. 실험 결과를 고려하면, 5 phr 이하의 소량으로 액상 PB를 첨가함으로써 실리카로 보강된 SBR 배합물의 특성을 향상시킬 수 있을 것으로 사료된다.

• Fibers and Polymers
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• 제4권4호
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• pp.182-187
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• 2003

Low molecular weight copolymers of maleic anhydride and vinyl acetate were prepared to develop formaldehyde free cross-linking agents. Since lower molecular weight is favorable for efficient penetration of the finishing agent into the cotton fibers in the padding process, the concentration of the initiator, chain transfer agent and the monomer ratios were varied to obtain copolymers of low molecular weights. The prepared polymers were characterized by GPC, $^1{H-NMR}$, FTIR, DSC and TGA. Copolymers of molecular weights of 2 000 to 10 000 were obtained and it was found that the most efficient method of controlling the molecular weight was by varying the monomer ratios. Poly(maleic anhydride-co-vinyl acetate) did not dissolve in water, but the maleic anhydride residue hydrolyzed within a few minutes to form poly(maleic acid-co-vinyl acetate) and dissolved in water. However, the maleic acid units undergo dehydration to form anhydride groups on heating above ${160}^{\circ}C$ to some extent even in the absence of catalysts. The possibility of using the copolymers as durable press finishing agent for cotton fabric was investigated. Lower molecular weight poly(maleic anhydride-co-vinyl acetate) copolymers were more efficient in introducing crease resistance, which appears to be due to the more efficient penetration of the cross-linking agent into cotton fabrics. The wrinkle recovery angles of cotton fabrics treated with poly(maleic anhydride-co-vinyl acetate) copolymers were slightly lower than those treated with DMDHEU and were higher when higher curing temperatures or higher concentrations of copolymer were used, and when catalyst, $NaH_2$$PO_2$, was added. The strength retention of the poly(maleic anhydride-co-vinyl acetate) treated cotton fabrics was excellent.

• Archives of Pharmacal Research
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• 제9권1호
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• pp.19-20
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• 1986

Reaction of dine alcohol 5 and maleic anhydride in benzene at either room temperature or reflux proceeds probably through a intermolecular Diels-Alder cycloaddition followed by lactone formation to give adduct 6.

• 대한화학회지
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• 제48권6호
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• pp.609-615
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• 2004

간염치료에 탁월한 효과를 나타내는 alkoxyallylthiopyridazine 유도체들이 maleic anhydrides로부터 합성되었다. 수용성 HCl에서 maleic anhydrides를 hydrazine monohydrate로 환류하면 dihydroxypyridazines이 얻어지며, 이 화합물을 phosphorus oxychloride로 반응시키면 dichloropyridazines으로 전환되었다. Dichloropyridazines에서 첫 번째 염소원자의 치환은 THF 용매에서 알코올성 sodium alkoxides에 의하여 선택적으로 일어나 alkoxy- chloropyridazines을 생성하며, 이 화합물은 lithium 2-propene-1-thiolate에 의하여 높은 수득율로 alkoxyallyl- thiopyridazines으로 전환되었다.

• Bulletin of the Korean Chemical Society
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• 제33권5호
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• pp.1643-1646
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• 2012

Three Ni-based catalysts with different clay as support were prepared and tested in the hydrogenation of maleic anhydride, among which Ni/clay1 showed best activity and selectivity. Over Ni/clay1 catalyst prepared by impregnation method, 97.14% conversion of maleic anhydride and 99.55% selectivity to succinic anhydride were obtained at $180^{\circ}C$ under a pressure of 1 MPa. Catalytic activity was greatly influenced by the temperature and weighted hourly space velocity. Catalyst deactivation studies showed that this catalyst have a long life time, the yield of MA still higher than 90% even after a reaction time of 60 h. X-ray diffraction (XRD) and $H_2$ temperature programmed reduction (TPR) were use to investigate the properties of the catalyst. XRD and TPR studies showed that Ni was present as $Ni^{2+}$ on the support, which indicated that there was no elemental nickel ($Ni^0$) and $Ni_2O_3$ in the unreduced samples. The formation of Ni was strong impact on catalytic activity.

• 공업화학
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• 제3권1호
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• pp.179-187
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• 1992

Poly(styrene-co-maleic anhydride), SMA를 DMF 용매에 약 10%(w/w) 용액으로 한 다음 aniline, p-toluidine 및 p-chloroaniline 등으로 maleic anhydride 반복 단위를 imide화 하였다. 이미드화에 있어서 환화 탈수제(cyclodehydration agents)를 사용하였으며 최적 반응조건은 다음과 같았다. (a) 반응온도 : $80^{\circ}C$ (b) 환화 탈수제의 몰비 : SMA내 anhydride/acetic anhydride/sodium acetate/triethyl amino = 1.0/2.0/0.2/1.1. 생성된 imide-modified SMA (SMI) 시료들은 이미드화도가 증가됨에 따라 $T_g$가 증가하였으나 그 변화 정도는 크지 않았다. SMI의 $T_g$는 이미드화에 사용된 아민의 종류에 따라 aniline < p-toluidine < p-chloroaniline의 순으로 $T_g$가 증가하였다.

• Carbon letters
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• 제20권
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• pp.39-46
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• 2016

In this work, the effects of maleic anhydride (MA) content on mechanical properties of chopped carbon fibers (CFs)-reinforced MA-grafted-polypropylene (MAPP) matrix composites. A direct oxyfluorination on CF surfaces was applied to increase the interfacial strength between the CFs and MAPP matrix. The mechanical properties of the CFs/MAPP composites are likely to be different in terms of MA content. Surface characteristics were observed by scanning electron microscope, Fourier transform infrared spectroscopy, and single fiber contact angle method. The mechanical properties of the composites were also measured by a critical stress intensity factor (K_IC). From the K_IC test results, the K_IC values were increased to a maximum value of 3.4 MPa with the 0.1 % of MA in the PP, and then decreased with higher MA content.

• Journal of the Korean Wood Science and Technology
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• 제21권2호
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• pp.31-37
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• 1993

Composites of styrene polymers with woody fibers were prepared, and the effect of compatibilizers on their mechanical properties was evaluated. To improve the compatibility of wood fibers and the matrix polymers, styrene-maleic anhydride copolymer(SMA) and maleic anhydride-modified polymers were used as compatibilizers. As results, maleic anhydride-modified polystyrene and SMA were proved to improve the tensile strength of the molded composites, and also were evaluated as good compatibilizers for the wood fiber polystyrene composite. Cellulosic fiber (dissolving pulp) provided better reinforcement than lignocellulosic fiber(thermomechanical pulp). On the contrary in the case of the composite of wood fiber and acrylonitrile-butadiene styrene copolymer(ABS), SMA and maleic anhydride-modified acrylonitrile-butadiene-styrene copolymer(MABS) did not act as compatibilizers. However, MABS was evaluated as a good polymer matrix to make wood fiber reinforced composite. The tensile properties of the composites of wood fiber and MABS were superior than those of wood fiber-ABS composites.

• 대한화학회지
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• 제13권4호
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• pp.273-280
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• 1969

Maleic Anhydride의 분자궤도를 다음의 파라미터를 사용하여 계산하였다. $h_{o}$=1, $h_{o}$=2, $k_{c=o}$ =0.8 ${\delta}_{{\alpha}_n}=2{\times}(0.3)^n$ 얻어진 분자궤도들로부터 Benzene과 Maleic Anhydride(MA)의 광화학적반응의 작용 에너지를 구하였다. 작용에너지에는 상수항이 포함될 수 있으며 이항이 작용 에너지에 크게 기여함을 보였고 이 반응의 메카니즘은 계산된 작용에너지로 잘 설명됨을 밝혔다. 또한 MA의 두번 째 첨가반응이 광화학적으로 가능하며 MA-Benzene의 부가 생성물은 잘 알려진 입체 화학적 구조를 가져야함을 증명하였다.