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Goh, Munju,Park, Jinwoo,Han, Yehdong,Ahn, Sangbum,Akagi, Kazuo The Royal Society of Chemistry 2012 Journal of materials chemistry Vol.22 No.48
<P>The chirality transfer of axially chiral binaphthyl derivatives bearing liquid crystal (LC) moieties at the <I>n</I>,<I>n</I>′ positions (<I>n</I> = 3, 4, 6) of the binaphthyl rings to nematic (N) and smectic (S) LCs is investigated. Chiral nematic LCs (N*-LCs) are prepared by adding a small amount of the chiral binaphthyl derivative into host N-LCs composed of cyanobiphenyl mesogen cores. The binaphthyl derivative with phenylcyclohexyl (PCH) type LC moieties at the 4,4′ positions of the binaphthyl ring [<B>D-4,4′</B>] exhibits a low helical twisting power (HTP) of 11 μm<SUP>−1</SUP>. In contrast, those with LC moieties at the 3,3′ and 6,6′ positions of the binaphthyl rings [<B>D-3,3′</B> and <B>D-6,6′</B>] exhibit high HTPs of 153 μm<SUP>−1</SUP> and 154 μm<SUP>−1</SUP>, respectively. Next, the binaphthyl derivatives are added into two types of S-LCs with phenylbenzoate mesogen cores: 4-(4-methylpentyloxy)phenyl-4-(decyloxy)benzoate [<B>PhB1</B>] and 4-(3-methylpentyloxy)phenyl-4-(decyloxy)benzoate [<B>PhB2</B>]. The mixture of the host LC, <B>PhB1</B> or <B>PhB2</B> with the chiral dopant, <B>D-3,3′</B> or <B>D-6,6′</B> shows chiral smectic LCs C (S<SUB>C</SUB>*-LCs). The highly twisted S<SUB>C</SUB>* phases with helical pitches of 1.2–1.4 μm are prepared in <B>PhB1</B> and <B>PhB2</B> by using the chiral dopant of <B>D-6,6′</B>. It is concluded that <B>D-6,6′</B> has a large helical twisting power and is the most favourable atropisomeric chiral inducer for chirality transfer to both N-LCs and S-LCs.</P> <P>Graphic Abstract</P><P>POM images of N* and S<SUB>C</SUB>* phases induced by adding atropisomeric chiral binaphthyl derivatives into N- and S<SUB>C</SUB>-LCs, respectively. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2jm35282f'> </P>
Munju Goh,Yong Mun Choi 한국탄소학회 2012 Carbon Letters Vol.13 No.4
Polyacetylene (PA) films with vertically aligned fibril morphology were synthesized in homeotropic nematic liquid crystal (N-LC) solvent by using a magnetic field of 5 Tesla as an external perturbation. Scanning electron microscope (SEM) photographs indicated that the lengths of fibrils from the substrate were 5-35μm, depending on polymerization time. Carbonization was carried out using iodine-doped PA film and a morphology-retaining carbonization method. From the SEM results, we confirmed that the vertical morphology of the PA remains unchanged even after carbonization at 800℃. The weight loss of the films due to carbonization at 800℃ is about 20% of the weight of the film before iodine doping. It is expected that vertically aligned carbon might be a precursor for preparing vertical graphite materials, which materials could be useful for electrochemical energy storage and cell electrodes.
고문주(Munju Goh) 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
최근 자동차 및 항공기의 무게를 감소시켜 연료를 절감하는 친환경 기술의 하나로 탄소섬유의 사용이 각광받고 있다. 그러나, 사용 후 폐기된 탄소섬유복합재료는 매립되거나 고온소각 방식으로 재활용되고 있으나, 매립방식은 썩지 않는 환경오염 문제가 있으며, 고온소각방식 역시 유기물의 열분해시 독성물질을 배출하여 환경오염의 문제점을 가지고 있다. 본 연구에서는 버려지는 탄소섬유강화플라스틱에 물과 저렴한 첨가제만 넣고 100 ℃의 온도(상압)를 가해 처리하는 방식으로 탄소섬유를 회수할 수 있는 친환경 고효율 재활용 기술을 개발하였다. 또한 본 기술은 탄소섬유강화플라스틱으로부터 탄소섬유 및 에폭시 분해물까지 재활용 가능한 새로운 개념의 화학적 재활용 기술을 소개하고자 한다.
Kim, Hyeonil,Yeo, Hyeonuk,Goh, Munju,Ku, Bon-Cheol,Hahn, Jae Ryang,You, Nam-Ho Elsevier 2016 European polymer journal Vol.75 No.-
<P><B>Abstract</B></P> <P>A highly refractive and transparent photo-curable polymer resin containing 3,4-ethylenedithiothiophene units in the polymer chain has been developed. The polymer derived from 1,5-bis(2-acryloylenethyl)-3,4-ethylenedithiothiophene (BASEDTT) was prepared by photopolymerization using diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide as a photo initiator under UV irradiation. The polymer exhibited high thermal properties, including a glass transition temperature (>134°C), and a 5% weight loss temperature of 308°C under nitrogen. The polymer also showed good optical properties, such as high optical transparency in the visible region, a low birefringence of 0.0043 and a high refractive index of 1.6444 at 637nm.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Sulfur containing photo-curable polymer resin was prepared by the Photo-polymerization. </LI> <LI> The polymer films exhibited a refractive index of 1.6444 at 637nm and low birefringence of 0.0043. </LI> <LI> The thermal properties of polymers were investigated. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>This paper presents synthesis and characterization of highly refractive and transparent photo-curable polymer resin containing 3,4-ethylenedithiothiophene unit in the polymer chains.</P> <P>[DISPLAY OMISSION]</P>
Bong, Sehwa,Yeo, Hyeonuk,Goh, Munju,Ku, Bon-Cheol,Kim, Yoo Young,Bong, Pill-Hoon,Park, Byoungnam,You, Nam-Ho The Polymer Society of Korea 2016 Macromolecular Research Vol.24 No.12
A new aromatic polyimides (PIs) having asymmetric aromatic diamine with methyl groups at the ortho position of amino group has been developed to prepare transparent film in the visible region. The all aromatic PIs presented here are derived from 4-(4-aminophenoxy)-2,6-dimethylaniline (APDMA) and aromatic dianhydride, 4,4'-(hexafluoroisopropylidene)diphthalic anhydride (6FDA), 4,4'-oxydiphthalic anhydride (ODPA), 4,4'-biphthalic anhydride (BPDA), and pyromellitic dianhydride (PMDA) via a two-step polycondensation. All PIs show good thermal properties: 5% weight loss at a temperature range of <TEX>$510-529^{\circ}C$</TEX> and their glass transition temperature found above <TEX>$290^{\circ}C$</TEX>. The PIs exhibit good optical transparency, such as cut-off wavelength in the region of 296-358 nm and above 92-99% at 550 nm. In addition, all PIs show low refractive indices in the range of 1.567-1.637 at wavelength of 637 nm and low birefringence.