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- 주제어 : Colorless polyimide (검색결과 36 건)
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Synthesis of a new diamine and its effect on the residual stress of colorless polyimide
이주헌,김광인,김건휘,한학수 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.3
A new diamine was designed and synthesized to improve the flexibility of colorless polyimides by reducing residual stress. Four variations of colorless polyimides with the same dianhydride (4,4'-(hexafluoroisopropylidene)- diphthalic) and four different diamines (bis[4-(3-aminophenoxy)-phenyl] sulfone, bis(3-aminophenyl) sulfone, 2,2'- bis(trifluoromethyl)benzidine, and 2,2-bis(4-aminophenyl)-hexafluoropropane) were used. A series of colorless polyimides were prepared by adding the new diamine. The carbon and ether bonds between the benzene rings of the new diamine affected the flexibility and optical properties of colorless polyimide. The synthesis of the new diamine was confirmed by NMR measurements. Furthermore, the decrease in residual stress at room temperature and the glass transition temperature was confirmed. The effect of the new diamine was most evident for polyimide with a bulky and rigid structure. Though a slight yellow color appears because of the broken charge transfer complex balance, controlling the content of the new diamine will allow application of polyimides in flexible display.
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Optically Transparent and Colorless Polyimide Hybrid Films with Various Clay Contents
김영민,장진해,김정철 한국고분자학회 2012 Macromolecular Research Vol.20 No.12
Poly(amic acid) (PAA) was prepared by the reaction of 4,4-(hexafluoroisopropylidene)diphthalic anhydride with m-xylylenediamine in N,N-dimethylacetamide. Hybrid films were obtained from solutions of the precursor polymer blended with varying amounts of pristine saponite (SPT) clay (0-25 wt%). The cast PAA film was heat-treated at different temperatures to create polyimide (PI) hybrid films, which showed excellent optical transparencies and were almost colorless. The wide-angle X-ray diffraction and transmittance electron microscopy results for the PI hybrid films showed a substantial increase in the agglomeration of the clay particles as the clay loading was increased from 10-25 wt%. This finding suggests that in hybrid materials with low clay contents, the clay particles are better dispersed in the matrix polymer and do not agglomerate significantly. The addition of some amount of clay was sufficient to improve the thermal and oxygen barrier properties of the PI, with a maximum improvement observed at 20 wt% SPT.
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Lee, Do Hee,Yun, Hyung Duk,Jung, Eui Dae,Chu, Jae Hwan,Nam, Yun Seok,Song, Seunguk,Seok, Shi-Hyun,Song, Myoung Hoon,Kwon, Soon-Yong American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.23
<P>A novel flexible transparent electrode (TE) having a trilayer-stacked geometry and high optoelectronic performance and operational stability was fabricated by the spin coating method. The trilayer was composed of an ultrathin graphene (Gr) film sandwiched between a transparent and colorless polyimide (TCPI) layer and a methanesulfonic acid (MSA)-treated poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) layer containing dimethylsulfoxide and Zonyl fluorosurfactant (designated as MSA-PDZ film). The introduction of solution-processable TCPI enabled the direct formation of high-quality graphene on organic surfaces with a clean interface. Stable doping of graphene with the MSA-PDZ film enabled tuning of the inherent work function and optoelectronic properties of the PEDOT:PSS films, leading to a high figure of merit of ∼70 in the as-fabricated TEs. Particularly, from multivariate and repetitive harsh environmental tests (<I>T</I> = −50 to 90 °C, over 90 RH%), the TCPI/Gr heterostructure exhibited excellent tolerance to mechanical and thermal stresses and gas barrier properties that protected the MSA-PDZ film from exposure to moisture. Owing to the synergetic effect from the TCPI/Gr/MSA-PDZ anode structure, the TCPI/Gr/MSA-PDZ-based polymer light-emitting diodes showed highly improved current and power efficiencies with maxima as high as 20.84 cd/A and 22.92 lm/W, respectively (comparable to those of indium tin oxide based PLEDs), in addition to much enhanced mechanical flexibility.</P> [FIG OMISSION]</BR>
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Fabrication of optically-functionalized colorless polyimide patterns with high durability
Jun, Junho,Lee, Ji-Hyun,Choi, Hak-Jong,Moon, Sungjin,Kim, Il-Doo,Lee, Heon Elsevier 2017 APPLIED SURFACE SCIENCE - Vol.423 No.-
<P><B>Abstract</B></P> <P>Colorless polyimide (CPI) is a promising material for flexible substrates because of its excellent mechanical hardness, chemical durability, thermal stability, and high optical transmittance. In particular, its superior durability under heating and mechanical forces compared with other polymeric materials makes polyimide compatible for industrial applications. Thus, it has been actively investigated for use in preparing flexible and transparent substrates for optical devices. Nevertheless, there is little research on the direct pattering of CPI to form structures with various optical functions. In this research, a simple and cost-effective process involving the patterning of optically functional structures and imidization via thermal nanoimprint lithography (NIL) was developed. CPI films patterned with structures such as nanoscale and microscale cones were fabricated by thermal NIL, and their optical functions, including their anti-reflection and high scattering properties, were demonstrated by UV–vis analysis. Moreover, the patterned CPI film has an excellent thermal stability and a mechanical hardness up to 1.12GPa; this value was nearly maintained even at 400°C. Therefore, nano- to microscale optical patterns of CPI were successfully formed, and these structures are stable towards mechanical damage and high temperatures.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Polyamic acid based imprinting resin was synthesized and investigated for CPI (colorless polyimide) patterning. </LI> <LI> Optical patterns such as moth-eye, micro-cone were fabricated via thmeral-nanoimprint lithography. </LI> <LI> Fabricated optical structures of CPI had high durability on mechancial scratch and heat: Mechanical hardness is up to 1.12GPa and this value and optical structures were kept at 400°C without degradation. </LI> </UL> </P>
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비용 효율적인 유연 디스플레이용 무색 투명 폴리이미드 필름 제작
오충석,조다운,김지호 한국반도체디스플레이기술학회 2023 반도체디스플레이기술학회지 Vol.22 No.1
As the demand for large flexible displays such as tablet computers continues to rise, there is an increasing need for cost-efficient colorless and optically transparent polyimide film that can meet the desired performance, particularly optical transmittance. In this study, we investigated a detailed procedure for achieving optimal optical transmittance using two different combinations of monomers: 6FDA+BAPB and 6FDA+BPA+TFDB. We employed a design of experiment method to systematically synthesize polymers, allowing for the optimization of optical transmittance. In addition, we were able to achieve uniform thickness in the films by using a doctor blade. By comparing the price and optical transmittance of four different monomer combinations, we obtained fundamental data on the production of polyimide films that can be customized to meet the specific price and performance requirements of manufacturers. This approach enables users to select the most suitable polyimide film based on their desired price and performance parameters while achieving optimal optical transmittance.
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Kang, Sin-Bi,Kim, Hyo-Joong,Noh, Yong-Jin,Na, Seok-In,Kim, Han-Ki Elsevier 2015 Nano energy Vol.11 No.-
<P><B>Abstract</B></P> <P>We report on the successful face-to-face transfer of crystalline ITO (c-ITO) films from Si wafers to flexible colorless polyimide (CPI) substrates for application in high-performance flexible organic solar cells (OSCs). By using an Ag sacrificial layer and by coating of a CPI solution onto high-temperature processed c-ITO films, the film can be directly transferred from a Si wafer to a flexible CPI substrate without changing its sheet resistance or optical transmittance. At the optimized thickness of 100nm, the transferred c-ITO film showed sheet resistance of 25.65Ω/square, optical transmittance of 83.8%, and critical bending radius of 5.5mm, which are acceptable values in the fabrication of flexible OSCs. The flexible OSCs fabricated on the transferred c-ITO anode exhibited good cell performance with a fill factor of 68.99 %, a short circuit current of 8.90mA/cm<SUP>2</SUP>, an open circuit voltage of 0.821V, and a power conversion efficiency of 5.041 %, comparable to that of OSC with reference ITO/glass (5.67%). This indicating that transferred c-ITO film is a promising flexible and transparent anode for high performance FOSCs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Crystalline ITO films were transferred from rigid Si wafers to flexible colorless polyimide substrates. </LI> <LI> Transferred ITO films showed a low resistance and high transparency as well as good flexibility. </LI> <LI> Transferred ITO film is a promising flexible and transparent anode for flexible organic solar cells. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>A graphic for the Table of Contents must be supplied with each article. This graphic, in conjunction with the manuscript title, should give the reader a summary of the research described in the article. This graphic can be no wider than 9.0cm and no taller than 3.5cm and should be prepared following the specifications under Artwork. Text should be limited to essential technical labels.</P> <P>[DISPLAY OMISSION]</P>
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김영민,장진해 한국고분자학회 2013 Macromolecular Research Vol.21 No.2
A series of colorless and transparent polyimide (PI) hybrid films was synthesized from bicyclo[2.2.2]oct-7-ene-2,3,5,6-tetracarboxylic dianhydride (BTDA) and bis[4-(3-aminophenoxy)phenyl] sulfone (m-BAPS) with various clay contents, by solution intercalation polymerization to poly(amic acid)s, followed by thermal imidization. The thermal properties, morphologies, optical transparencies, and gas permeations of the PI hybrid films were examined for organoclay loadings ranging from 0 to 40 wt%. Up to a clay loading of 20 wt%, the clay particles were found to be highly dispersed in the PI matrix without any agglomeration of particles. However, for a clay content above 20wt% some agglomerated structures form in the polymer matrix. The thermal and oxygen barrier properties of the PI hybrid films were gradually improved by increasing the organoclay content from 0 to 40 wt%. However, the optical transparency of the PI hybrid films deteriorated with increasing organoclay content.
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Hong-jiang Ni,Jin-gang Liu,Zhen-he Wang,Shi-yong Yang 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.28 No.-
Recent research and development of colorless and optically transparent polyimide (CPI) films have beenreviewed. CPI films possess both of the merits of conventional aromatic PI films and common polymeroptical film; thus have been widely investigated as components for microelectronic and optoelectronicfabrications. The current review coveres the latest research and development for CPI films, includingsynthesis chemistry, manufacturing process, and engineering applications. Especially, this reviewfocuses on the applications of CPI films as flexible substrates for optoelectrical devices, such as flexibleactive matrix organic light emitting display devices (AMOLEDs), flexible printing circuit boards (FPCBs),and flexible solar cells.
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