• 공업화학
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• 제9권7호
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• pp.1053-1058
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• 1998

Poly(vinyl alcohol)(PVA)와 n-butylaldehyde를 산촉매하에서 반응시켜 butyral unit의 함량이 서로 다른 poly(vinyl butyral)(PVB)를 합성하였으며, PVB내 butyral unit의 함량은 원소분석으로부터 결정하였다. 합성된 PVB와 p-azidobenzaldehyde를 산촉매하에서 반응시켜 azidobenzene기가 도입된 감광성수지(PVB-AZ)를 합성하였으며, PVB-AZ내 azidobenzene기의 함량은 UV 분광분석법으로 결정하였다. 합성된 PVB-AZ의 감광특성, 열적성질 및 용해특성을 조사하였으며, 상대감도 변화를 gray scale(GS)법으로 조사하였다.PVB-AZ내 butyral unit의 함량, azidobenzene기의 함량 및 현상용매에 따라 GS법에 의한 상대감도가 서로 다르게 나타났으며, 공유결합으로 감광기가 도입된 감광성수지(PVB-AZ)의 감도는 PVB에 감광제인 2,6-bis(p-azidobenzylidene) cyclohexanone(BAC)가 혼합된 감광성수지(PVB-BAC)보다 우수하였다.

• 한국염색가공학회지
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• 제27권2호
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• pp.113-118
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• 2015

Poly(vinyl butyral), PVB was photooxidized by UV/ozone irradiation and the effect of UV energy on the surface properties of the UV-irradiated PVB film were investigated by the measurement of reflectance, surface roughness, contact angles, elemental composition, and zeta potential. With increasing UV energy, reflectance decreased in the visible and ultraviolet regions particularly at the wavelength of 400nm. The irradiation produced nano-scale surface roughness including the maximum peak-to-valley roughness increased from 274nm for the unirradiated PVB to 370nm at the UV energy of $5.3J/cm^2$. The improved hydrophilicity was due to the higher $O_{1s}/C_{1s}$ resulting from the introduction of polar groups such as C=O bonds. The surface energy of the PVB film increased from $35.3mJ/m^2$ to $39.3mJ/m^2$ at the irradiation of $15.9J/cm^2$. While the zeta potentials decreased proportionally with increasing UV energy, the cationic dyeability of the PVB increased accordingly resulting from the improved affinity of the irradiated PVB surfaces containing the photochemically introduced anionic and dipolar dyeing sites.

• Bulletin of the Korean Chemical Society
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• 제28권4호
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• pp.662-666
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• 2007

Poly(vinyl butyral) (PVB) with different wt% water was studied gravimetrically as well as with 1H magic angle spinning (MAS) nuclear magnetic resonance (NMR). The composition of PVB samples changes during MAS NMR because of the centrifugal force. As MAS time progresses, initially free water was removed fast but bound water also was gradually depleted. More water was diminished at faster spinning speeds, longer spinning time, higher temperatures, and higher initial water contents. As water in PVB was reduced, the chemical shifts and line widths of different types of water and also those of PVB changed. Our results demonstrate that 1H MAS NMR carried out at 10 kHz in less than about 5 minutes is a convenient and sensitive technique to measure: (a) the content variations of different types of water in polymers, (b) the degree of the interaction of water and polymer, and (c) the molecular dynamics of the polymer. Our study can be extended to different soft polymers with other small molecules than water in them.

• 폴리머
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• 제26권2호
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• pp.168-173
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• 2002

폴리비닐알코올(PVA)을 부틸알데히드로 아세탈화하여 폴리비닐부티랄(PVB)을 합성하였다. PVB는 물을 용매로 침전법에 의하여 입자형태로 제조되었으며 생성된 PVB의 화학적 물리적 특성을 여러 방법을 이용하여 분석, 측정하였다. 제조된 PVB입자는 100~700 $\mu\textrm{m}$의 입도분포내에서 약 380$\mu\textrm{m}$의 평균입자크기를 나타내었다. PVB의 화학구조는 FT/IR과 NMR을 이용하여 확인할 수 있었으며 적정분석 결과 아세탈화정도는 약 77%로 나타났다. DSC 분석결과 PVA가 PVB로 아세탈화됨에 따라 PVA의 결정성이 사라졌으며, 유리전이온도가 $70^{\circ}C$근처에서 나타났다. TGA 분석결과 제조된 PVB는 반응물인 PVA에 비해 열적으로 매우 안정하여 $300^{\circ}C$까지 열분해를 보이지 않았다. 용해도 분석결과 PVB는 PVA와는 달리 알콜류에는 용해되었으나 물에는 용해되지 않았다.

• E2M - 전기 전자와 첨단 소재
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• 제7권5호
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• pp.409-416
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• 1994

A double layered photoreceptor using phthalocyanine dye was made by dip-coating method. The under cutting layer(UCL) was coated with A1$\_$2/O$\_$3/ or polyamide, and the charge generation layer(CGL) was formed by .tau.-type metal-free phthalocyanine. The oxadiazole was used as a charge transport layer(CTL) and polycarbonate and poly(vinyl butyral) was employed as a host polymer. The .tau.-H$\_$2/Pc had an absorption peak around 780nm, which coincided with the emitting wavelengths of GaAlAs diode lasers. Maximum charge acceptance of CTL that gives thickness of 12.mu.m was -900V by corona charge of -6.0kV. In photo-induced discharge measurements, residual potential was less than -20V and sufficient for ordinary use, and sample films using of poly(vinyl butyral) was showed good charge retention. In printing test, drum that was employed polycarbonate as a host polymer showed the good print quality.

• 한국자기학회:학술대회 개요집
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• 한국자기학회 2008년도 Asian Magnetics Conference
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• pp.124.2-124.2
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• 2008

• 한국유변학회:학술대회논문집
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• 한국유변학회 2002년도 추계학술발표회 논문집
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• pp.167-170
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• 2002

No Abstract, See Full Text

• 한국자기공명학회논문지
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• 제6권1호
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• pp.1-11
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• 2002

Physical properties of PVB [Poly(vinyl butyral)] polymer are strongly correlated with water contents in the polymer. Thus dynamics of PVB containing 10~50(w/w) ％ of water were studied by $^{13}$ C CP/MAS/DD over the temperature range 293K -348K. From the Peak area, line width, chemical shift, and relaxation times ( $T_{1}$ $T_{1p}$) measured at 9.4 T, it was deduced that water facilitates molecular dynamics of the PVB molecules overall including conformational exchange of the racemic and meso butyaldehyde rings in the PVB. However, the influence of water was not linear to the amount of water in the PVB samples. It is suggested that water up to 30 w/w ％ of the sample is closely bound to the PVB polymer and water relatively free from the PVB polymer starts to appear when water is added more than 30 w/w ％.％.

• 한국표면공학회지
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• 제28권1호
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• pp.46-54
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• 1995

An electrochromic(EC) cell was constructed using $WO_3$ as a electrochromic material and NiO as a counter electrode, deposited onto ITO-coated glass by the implementation of electron beam evaporation. The electrolytic media were both lithium and proton conducting polymers such as poly-acrylonitrile(PAN)-$LiClO_4$, poly-ethylene oxide(PEO)-$LiClO_4$, poly-vinyl butyral(PVB)-LiCl and PVB-H$_3$$PO_4$. Potentiodynamic cycling of the cells using PAN-$LiClO_4$, or PVB-$H_3$$PO_4$ electrolyte yielded a transmission variation of more than 40% at the wavelength of 632.8 nm within less than 10 sec response time at room temperature. These results indicate that these electrolytes, transparent in gel type, are premising for the application in large area electrochromic windows.

• 센서학회지
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• 제5권1호
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• pp.15-22
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• 1996

감광성 고분자를 감지막 재료로 한 FET형 $Ca^{2+}$ sensor(Ca-ISFET)를 micropool법 및 사진식각법으로 제조하였다. 반도체 공정에 쓰이는 negative photoresist인 OMR-83을 감지막 재료로 사용한 경우, micropool법에 있어서는 가소제인 DOA를 포함하므로 좋은 감응 특성을 나타내었으나, 사진식각법에 있어서는 가소제를 사용할 수 없어 부적합하였다. Poly(vinyl butyral)을 감지막 재료로 하고, 사진식각법으로 제조된 Ca-ISFET는 $Ca^{2+}$ 농도 $10^{-4}{\sim}10^{-1}\;mole/{\ell}$ 범위에서 좋은 직선성을 나타내었으며, 감응기울기는 $23{\pm}0.2\;mV/decade$였다. 감지막 재료로서 PVB는 바탕소자인 pH-ISFET wafer 위에 adhesion promoter 용액의 전처리를 하지 않아도 양호한 부착력을 나타내었으며, 가소제 이행의 문제가 없어서 막의 안정성이 좋은 특성이 있었다.