• Polymer(Korea)
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• v.29 no.6
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• pp.588-592
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• 2005

For the purpose of obtaining polycarbonate film which blocks ultra-violet ion beam was irradiated onto the surface of PC film. This method has gotten several advantages compared with the techniques, such as the protection of changes in film thickness and UV blocking material deposited onto a base film. In order to investigate UV blocking PC film, the optical and chemical characteristics, surface morphology and lightfastness were confirmed by UV/Vis, FTIR(ATR) spectroscopy, AFM, and Q-UV fasoess analyses. As a result, it was shown that the modified PC film was able to block almost all of UV region and easily control the degree of UV block. The optical changes in the film were attributed to chemical changes in PC surface by ion beam irradiation. Moreover, we expect that the modified PC film can durably block UV due to no changes in colour and UV transmittance after UV fastness test.

• Proceedings of the Korean Society of Dyers and Finishers Conference
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• 2012.03a
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• pp.25-25
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• 2012

농업용 비닐하우스에 사용되는 EVA (ethylene-vinylacetate copolymer)고분자 필름의 무적성을 향상시킬 목적으로 EVA 및 PVAc (polyvinylacetate)필름을 가성소다 용액으로 가수분해하여 친수성을 검토하였다. EVA는 분말상의 고분자를 프레스로 압착하여 필름으로 성형하였으며, PVAc는 아세톤에 용해한 후에 필름으로 성형하였다. 가수분해에 따른 필름의 구조변화는 적외선 분광분석으로, 친수성 변화는 접촉각으로 평가하였다. 가수분해 시간이 증가함에 따라 친수성이 증가하였다. 이는 가수분해에 의해 소수성인 아세테이트기가 친수성인 수산기로 변했기 때문으로 생각되었다. 한편, 가수분해시킨 EVA 및 PVAc를 사용하여 프레스로 압착하여 제조한 필름에서는 친수성이 그다지 크게 증가하지 않았다.

• Korean Chemical Engineering Research
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• v.46 no.1
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• pp.88-93
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• 2008

The bulk-heterojunction polymer solar cell based on regioregular P3HT (poly(3-hexylthiophene)) and PCBM (methanofullerene [6,6]-phenyl $C_{61}$-butyric acid methyl ester) was fabricated. Annealing effects on the crystal structure of polymer-fullerene blends as well as the UV-VIS electronic absorption spectroscopy were investigated. The correlation between the crystal organization of bulk-heterojunction film and the power conversion efficiency of solar cell was studied. Resultantly, the polymer solar cell annealed on $150^{\circ}C$ for 30 min, showed both the enhanced molecular interactions and the optimized crystal structure and displayed the power conversion efficiency of 3.2 %.

• Membrane Journal
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• v.33 no.5
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• pp.248-256
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• 2023

Indium tin oxide (ITO) transparent electrode film has been widely adopted for the various applications such as display and electric vehicle. In this paper, we studied how to enhance the thermoforming stability of ITO film by applying the highly conductive Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) thin layer. Based on the change of sheet resistance value, the influence of the additional solvent with different boiling point was investigated for the PEDOT:PSS coating solution. In addition, by analyzing optical transmittance and Raman spectrum, we confirmed the key mechanism which determine the final electrical conductivity of the PEDOT:PSS on ITO film using an ethylene glycol solvent. The final ITO transparent electrode coated with PEDOT:PSS performed the outstanding endurance of electrical conduction even in 126% stretching condition.

• Polymer(Korea)
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• v.33 no.6
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• pp.620-624
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• 2009

Biomedical metal implants have been used clinically for replacement, restoration, or improvement of injury bodies based on high mechanical properties, but it has some risks such as the inflammatory, late thrombosis, or restenosis due to the low biocompatibility and toxicity. In various techniques of surface treatment developed to preserve these drawbacks, this study examined the electrospray coating technology with biodegradable poly (lactic-co-glycoic acid) (PLGA) on metal surface. Based on fundamental examination of electrospraying and solution parameters, the surface morphology of coated film was closely related to the boiling point of solvent, in-flight distance, and droplet size. The thickness of polymer film was linearly proportional to the emerged volume. This result exhibits that the polymeric droplets were continuously deposited on the polymer film. Therefore, the electrospray coating technology might be applied into the fabrication of single/multi-layered polymer film in nano-/micro-thickness and the control of the topology for biomedical metal implants including stents.

• Electrical & Electronic Materials
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• v.6 no.4
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• pp.302-310
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• 1993

일렉트렛트이란 자석과 대칭한 호칭으로 영구전기분극을 갖는 절연체를 말한다. 일랙트렛트는 1919년 강구에 의해 창제되었는데 이것은 왁스와 송지를 등량으로 혼합하여 만든것이었으나 최근에는 테프론이나 마이러, 폴리프로필렌등의 고분자 필름으로 만들게 되었다. 많은 고분자 재료는 절연성이 좋고 가공 성형도 용이하기 때문에 일랙트렛트로 하기에 편리하다. 그중에서도 합성고분자 필름에 의한 일랙트렛트는 마이크로폰이나 카트리지 등의 음향소자에 쓰이는 외에 정전모우터, 릴레이스위치, 에어필터나 의용재료에 널리 이용될 가능성이 나오고 있다.

• Applied Chemistry for Engineering
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• v.32 no.5
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• pp.504-508
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• 2021

In this study, the effect of molecular features of guest molecules on the structure, property, and formation of poly(vinyl alcohol) (PVA)/beta-cyclodextrin (bCD) inclusion compound hybrid films was investigated using three types of guest molecules such as hydroquinone (HQ), arbutin (AB), and tranexamic acid (TA). First, the successful formation of inclusion compounds between bCD and the guest molecules, and polymer/inclusion compound hybrid were proved using Raman spectroscopy. The effect of bCD-based inclusion compounds on the structure and property of PVA matrix composites containing inclusion compounds was also studied using X-ray diffraction (XRD) and thermal analyses such as differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). It was notable that the effect of TA to the crystalline structure of the PVA was significantly different from that of using other guest molecules including HQ and AB. It was also supported by a simple molecular simulation result. This article will be a good example for demonstrating the effect of molecular characteristics on the inclusion compound formation in polymer films, which can provide important information for relevant future research.

• Polymer Science and Technology
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• v.9 no.4
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• pp.307-314
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• 1998

• Journal of Adhesion and Interface
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• v.19 no.4
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• pp.154-162
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• 2018

Plasma treatment and corona treatment have been used for surface modification of polydimethylsiloxane (PDMS) film by activating its surface with the -OH group. Adhesion promoter or coupling agent was also used to improve adhesion of PDMS film with various materials. However, obtained hydrophilicity onto the surface of PDMS films with those processes was transient and vulnerable. In this study, a new alkoxysilane-functionalized acrylic polymer precursor was first synthesized by copolymerization process, and then was reacted with HO-terminated PDMS through condensation reaction to prepare a new surface modifier for PDMS film. The structure and molecular weight of the prepared surface modifier were confirmed by 1H-NMR and GPC measurement. Surface properties of surface modifier-coated PDMS films were also investigated by using XPS, ATR and WCA analysis. The adhesion between the PDMS film and the surface modifier was tested using cross-cut test.

• Proceedings of the Optical Society of Korea Conference
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• 2003.02a
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• pp.250-251
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• 2003

여러 광기록 매질 중 아조(azo)계열의 색소를 첨가한 고분자 필름은 색소의 선택에 따라 원하는 감광 파장대를 선택할 수 있는 특징과 뛰어난 메모리 휘발성, 편광 선택이 가능한 점, 높은 환경적 안정성 때문에 1986년 Todorow 그룹이 아조색소를 함유한 고분자 필름의 광유도 비등방성에 관한 논문을 발표한 이래 많은 연구가 이루어지고 있다. 아조계열 색소분자는 PVA 고분자 매트릭스(matrix)속에서 trans 혹은 cis이성질체 중 하나의 상태로 존재할 수 있으나 trans 상태는 cis 상태보다 안정한 상태이므로 광이 없을 때는 대부분 trans 상태로 존재하게 된다. (중략)