• 한국고분자학회:학술대회논문집
• /
• 한국고분자학회 2006년도 IUPAC International Symposium on Advanced Polymers for Emerging Technologies
• /
• pp.349-349
• /
• 2006

Vinyl-polynorbornene has good thermal stability, high transparency and low dielectric constant. However, it has low solubility, poor mechanical and adhesive properties. In this work, polynorbornene derivatives were prepared by Pd(II) late transition metal catalyst. The polymers have good solubility, and are thermally stable up to$300^{\circ}C$ The glass transition temperature is decreased as the side-chain becomes bulkier. Structure-property relationship of polynorbornene derivatives measured by X-ray scattering, mechanical and electrical properties will be discussed.

• 공업화학
• /
• 제20권6호
• /
• pp.612-616
• /
• 2009

Transparent conducting oxide (TCO) 박막은 평판 디스플레이 산업에 널리 사용되고 있다. 화학적으로 우수한 투명전도성 indium zinc oxide (IZO) 필름은 현재 널리 사용되고 있는 indium tin oxide (ITO) 필름의 대체 물질로 관심을 끌고있다. 본 연구에서는 ITO에 비해 낮은 증착 온도에서도 낮은 비저항과 높은 투과율을 가지는 IZO 박막을 전자빔 증착법을 사용하여 polynorbornene (PNB) 기판(Tg = $330^{\circ}C$) 위에 증착하는 조건에 대하여 연구하였다. 90 : 10 wt%의 $In_2O_3$와 ZnO를 혼합하여 만든 타겟으로 전자빔 증착법을 이용하여 PNB 기판 위에 IZO 박막을 제조하여, 기판온도와 산소도입 속도에 따른 IZO 필름의 전기 광학적 특성을 연구하였다. 그 결과 4 sccm의 $O_2$, $150^{\circ}C$의 기판온도, 증착속도 $2{\AA}$/sec 및 $1000{\AA}$ 두께로 증착된 IZO 필름에서 우수한 전기 광학적 성질인 $5.446{\times}10^2{\Omega}/{\boxempty}$ 면저항 및 87.4% 광투과율을 얻을 수 있었다.

• 공업화학
• /
• 제21권2호
• /
• pp.224-229
• /
• 2010

Transparent conducting oxide (TCO) 박막은 평판 디스플레이 산업에 널리 사용되고 있다. 화학적으로 우수한 투명전도성 Indium Zinc Oxide (IZO) 필름은 Indium Tin Oxide (ITO) 필름의 대체 물질로 관심을 끌고 있다. 본 연구에서는 90 : 10 wt%의 $In_2O_3$와 ZnO를 혼합하여 만든 타겟으로 전자빔 증착법을 이용하여 polynorbornene (PNB) 기판 위에 IZO 박막을 제조하였다. UV/Visible spectrophotometer, 4-Point Probe를 이용하여 증착 두께와 산소도입 속도에 따른 IZO 필름의 전기적 및 광학적 특성을 연구하였으며, SEM, XRD 및 XPS를 이용하여 증착된 IZO의 구조적 특성 및 표면조성비를 연구하였다.

• Macromolecular Research
• /
• 제15권2호
• /
• pp.185-190
• /
• 2007

Poly(norbornene dimethyl dicarboxylate)s, (PNDMD)s, were prepared by addition polymerization with palladium(II) catalyst from pure exo-monomers, and their structure and properties were compared with those of poly(norbornene dicarboxylic acid dialkyl ester)s, (PNDADA)s. Both polymer series exhibited good solubility in general organic solvents and excellent thermal stability up to $330^{\circ}C$. Wide-angle X-ray scattering (WAXS) study indicated the presence of nano-scale layer-like order in amorphous PNDADAs, while PNDMDs showed random amorphous structure. The glass transition temperatures and dielectric constants of solid polymers were found to decrease as the alkyl side-chain length increases for both polymer series. However, PNDMDs showed lower glass transition temperatures and higher dielectric constants, as compared with those of PNDADAs containing the same alkyl substituents. This difference, caused by the higher side-group mobility of PNDMDs, may be closely related to the nano-scale order in amorphous PNDADAs and its absence in PNDMDs.

• Macromolecular Research
• /
• 제17권12호
• /
• pp.995-1002
• /
• 2009

Luminescent polynorbornene (PNB)/quantum dot (CdSe@ZnS; QD) composite nanorods and nanotubes were successfully prepared using anodic aluminum oxide (AAO) membranes of various pore sizes as templates. To protect QDs with high quantum yield from quenching during the phosphoric acid treatment used to remove the AAO templates, chemically stable and optically clear norbornene-maleic anhydride copolymers (P(NB-r-MA)) were employed as a capping agent for QDs. The amine-terminated QDs reacted with maleic anhydride moieties in P(NB-r-MA) to form PNB-grafted QDs. The chemical- and photo-stability of QDs encapsulated with PNB copolymers were investigated by photoluminescence (PL) spectroscopy. By varying the pore size of the AAO templates from 40 to 380 urn, PNB/QD composite nanorods or nanotubes were obtained with a good dispersion of QDs in the PNB matrix.

• Macromolecular Research
• /
• 제14권1호
• /
• pp.107-113
• /
• 2006

Processible norbornene copolymers were realized by judiciously designing norbomene comonomers, which were themselves prepared by the Diels-Alder reaction of cyclopentadiene and benzoquinone followed by the isomerization and alkylation of alcohols. The norbornene copolymers containing these derivatized comonomers, prepared by [Pd($x_{2}CH-{3} $)$_{4}$][$SbF_{6}$]$_{2}$ catalyst, exhibited excellent solubility in many organic solvents as well as good thermal stability, as evidenced by their high glass transition ($T_{g}$) and decomposition ($\∼$350$^{circ}C$) temperatures. In addition, fairly strong adhesion to substrates such as glasses and silicon wafers was also achieved with these copolymers to overcome the limitations experienced by polynorbornene homopolymers and to make them attractive for many important industrial applications.

• 한국지반신소재학회논문집
• /
• 제22권4호
• /
• pp.35-42
• /
• 2023

본 연구에서는 유기오염물의 흡수가 가능한 차수재의 반응재료에 대하여 지중 매입 재료로서의 적용성을 평가하기 위해 오염물의 접촉에 의한 강도 특성 변화를 평가하였으며, 강도 평가는 일축압축시험 결과를 이용하였다. 시험 결과, 오염물 종류에 따른 반응재료의 강도는 물 > TCE > TPH의 순서로 확인되었다. 그러나 폴리노보넨의 구성비가 12% 이하에서는 TPH의 강도가 TCE에 비하여 크게 나타났다. 물로 접촉된 반응재료는 폴리노보넨의 구성비가 작을수록 강도가 지속적으로 감소하였지만, TCE 및 TPH와 접촉된 반응재료의 강도는 폴리노보넨의 구성비가 30%에서 21%까지 작아질수록 증가하다가 이후에는 감소하였다. 즉, 지중에서 발생되는 응력 조건에 따라 오염물의 접촉에 의한 강도를 고려하여 반응재료의 최적 구성비가 적용되어야 한다.

• Bulletin of the Korean Chemical Society
• /
• 제32권spc8호
• /
• pp.3074-3080
• /
• 2011

We synthesized three novel poly(norbornene bisimide)s by ring opening metathesis polymerization (ROMP) and subsequent hydrogenation. Their thermal, mechanical and optical properties were investigated with TGA, DMA, UV-Vis spectrometer, and optical reflectometer. The new polymers showed high glass transition temperatures over $260^{\circ}C$ and good thermal stability with 5% wt-loss temperature higher than $390^{\circ}C$. When solvent casted, they yielded optically transparent and dimensionally stable films with a relatively low coefficient of thermal expansion of about 50 ppm $K^{-1}$. Therefore, the bisimide moieties substantially enhanced thermal and dimensional stabilities, as compared with normal ROMP-prepared polynorbornene films. Though the water uptake was increased to 0.6 wt-%, this water uptake is still considerably lower than that for polyethersulfones (1.4 wt-%) or polyimides (2.0 wt-%). Hence, the new poly(norbornene bisimide)s may become attractive candidates for flexible substrates of optoelectronic devices such as displays and photovoltaic solar cells.

• 한국고분자학회:학술대회논문집
• /
• 한국고분자학회 2006년도 IUPAC International Symposium on Advanced Polymers for Emerging Technologies
• /
• pp.200-200
• /
• 2006

Several polynorbornene or poly(norbornene-7-oxide) based functional block copolymers were synthesized by ring opening metathesis polymerization (ROMP) with good molecular weight and polydispersity control. Some representative functional groups in these polymers are a nitrobenzoyl group or ferrocene. These polymers were subjected to various chemical modification reactions to give other block copolymers that contain novel functionality such as amine, diazonium salt, and diazo groups. The resulting polymers were characterized by various techniques such as GPC, NMR, UV-VIS, AFM, and cyclovotammography (CV).

• Bulletin of the Korean Chemical Society
• /
• 제23권7호
• /
• pp.957-963
• /
• 2002

We successfully synthesized the addition-type polynorbonenes (PNB) exhibiting photochromic properties and excellent thermal stability. Three norbornene-based monomers with different azobenzene moiety (R=NO2, H,OCH3) were synthesized by transesterification method. The corresponding PNB copolymers were synthesized by transition metal-catalyzed addition polymerization method, and characterized by GPC, UV-Vis spectroscopy, NMR, and thermal analysis. For comparison of the photochromic properties depending on the rigidity of polymer backbone, we prepared the polymethylmethacrylate (PMMA) copolymer with the corresponding azobenzene moiety. We investigated the photoisomerization behavior by means of optical muitichannel analyzer with Xe lamp as well as real-time UV-Vis spectroscopy with high-pressure mercury lamp. Among three PNB copolymers, a polymer with azobenzene (R=H) was the most adaptable for observation of photoisomerization behavior. It was found that the rate of photoisomerization and relaxation depended on the structure of azobenzene chromophore, rather than that of polymer backbone.