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Swelling Process of thin polymer film Studied via in situ Spectroscopic Ellipsometry

Chemical Research in Chinese Universities 2017年第5期33卷 833-838页

作者： XU Lin ZOU Zhiming ZHANG Huanhuan SHI Tongfei Laboratory of Surface Physics and Chemistry Guizhou Education University Guiyang 550018 P. R. China Guangxi Key Laboratory of Electrochemical and Magneto-chemical Functional Materials College of Chemistry and Bioengineering Guilin University of Technology Guilin 541004 P. R. China State Key Laboratory of polymer Physics and Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 P R. China University of Chinese Academy of Sciences Beijing 100049 P. R. China

The swelling process of thin polystyrene films in quantity was studied in this paper using the in situ spec- troscopic ellipsometry. We systematically investigated the influence of film thickness on the swelling process of thin polystyrene films. The results show that in the case of high Mw polystyrene（Mw=400000）, the curve of the swelling degree as a function of time discloses that the relaxation of the long polymer chains accompanies the diffusion of acetone molecules, The swelling process is via the Fickian relaxation mechanism. Both the values of the equilibrium swelling degree and the diffusion coefficient of acetone molecules in the polystyrene film decrease as the film thick- ness reduces under confinement. However, in the case of lowMw PS（Mw=4100）, the dewetting process is so fast be- fore the equilibrium of swelling that the whole swelling process cannot be observed.

关键词： thin polymer film Solvent swelling Dewetting

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Dewetting Kinetics of thin polymer films with Different Architectures:Effect of polymer Adsorption

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Chinese Journal of polymer Science 2018年第8期36卷 984-990页

作者： Li-Na Wang Huan-Huan Zhang Lin Xu Bin-Yuan Liu Tong-Fei Shi Shi-Chun Jiang Li-Jia An School of Materials Science and Engineering Tianjin University State Key Laboratory of polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of Sciences Laboratory of Surface Physics and Chemistry Guizhou Education University Department of polymer Science and Engineering Hebei University of Technology

We have investigated the influence of the adsorption process on the dewetting behavior of the linear polystyrene film （LPS）, the 3-arm star polystyrene film （3SPS） and the ring polystyrene film （RPS） on the silanized Si substrate. Results show that the adsorption process greatly influences the dewetting behavior of the thin polymer films. On the silanized Si substrate, the 3SPS chains exhibit stronger adsorption compared with the LPS chains and RPS chains; as a result, the wetting layer forms more easily. For LPS films, with the decrease of annealing temperature, the kinetics of polymer film changes from exponential behavior to slip dewetting. As a comparison, the stability of 3SPS and RPS films switches from slip dewetting to unusual dewetting kinetic behavior. The adsorbed nanodroplets on the solid substrate play an important role in the dewetting kinetics by reducing the driving force of dewetting and increase the resistant force of dewetting. Additionally, Brownian dynamics （BD） simulation shows that the absolute values of adsorption energy （ε） gradually increase from linear polymer （-0.3896） to ring polymer （-0.4033） and to star polymer （-0.4264）, which is consistent with the results of our adsorption experiments.

关键词： thin polymer film Star polystyrene Ring polystyrene Dewetting Adsorption

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Effect of Interfacial Adsorption on the Stability of thin polymer films in a Solvent-induced Process

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Chinese Journal of polymer Science 2021年第4期39卷 501-511,I0008页

作者： Lin Xu Tong-Fei Shi Li-Jia An Yu-Yuan Lu Li-Na Wang Innovation Center for Textile Science and Technology Donghua UniversityShanghai201620China State Key Laboratory of polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China Testing and Analysis Center Hebei Normal UniversityShijiazhuang 050024China

The stability of ultrathin polymer films plays a crucial role in their technological ***,we systematically investigated the influence of interfacial adsorption in physical aging and the stability of thin polymer films in the solvent-induced *** further identify the stability mechanism from the theory of thin film *** results show that the aging temperature and film thickness can strongly influence the stability of thin PS films in acetone *** aging can greatly improve the stability of thin polymer films when the aging temperature T_(aging1)>T_(g).A thinner PS film more quickly reaches a stable state via physical *** short aging time,the formation of the adsorbed layer can reduce the polar interaction;however,it slightly influences the stability of thin polymer films in the solvent-induced *** later aging stage,the conformational rearrangement of the polymer chains induced by the interfacial effect at the aging temperature Taging1 plays an important role in stabilizing the thin polymer ***,at T_(aging2)thin polymer *** formation of the adsorbed layer at Taging2 can reduce the short-range polar interaction of the thin film system and cannot suppress the instability of thin polymer films in the solvent-induced *** results provide further insight into the stable mechanism of thin polymer films in the solvent-induced process.

关键词： thin polymer film Interfacial adsorption Dewetting Swelling process

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FABRICATION AND CHARACTERIZATION OF ORGANIC thin filmS WITH NANO-STRUCTURE

FABRICATION AND CHARACTERIZATION OF ORGANIC THIN FILMS WITH ...

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中国真空学会五届三次理事会暨学术会议

作者： Takashi H Noritaka Y Chen Guorong Shin Horiuchi Norio Tanaka Tetsuo Moriya Photonics Research Institute National Institute of Advanced Industrial Science & Technology Midorigaoka 1-8-31 Ike-daOsaka 563-8577 Japan Fudan University 220 Handan Road Shanghai200433 China National Institute of Materials and Chemical Research 1-1-4 Higashi Tsukuba Ibaraki 305- 8565 Japan3 Dainichiseika Color & Chemi- cals Manufacturing Co. Ltd. 1-9-4 Horinouchi Adachi-ku Tokyo 123-8555 Japan Electrotechnical Laboratory 1-1-4 Umezono Tsukuba Ibaraki 305- 8568 Japan

A novel method of thin film formation of organic materials with nano-structure has been successfully developed by using vacuum technique is *** diarylethene(Ci8Hi8N2S2) was selected as a model compound for the evaluation of this method. polymer film of PMMA, PBzMA, PHPM and PC were prepared for present experiment. By comparing these kinds of polymer, we found that the tendency of dye dispersion into the polymer is as follows:PC>PBzMA>PMMA>PHPMA, where no dispersion is observed for PHPMA under the condition of 115℃for 24 hours,thin film of polymer alloy composed of PMMA and polystylene(PS)was loaded into a glass ample with diarylethene,and treated for three days at 100℃.Dispersed state of the dye was evaluated by transmission electron microscope, and concluded that the dye is distributed only in PS domains selectively. Photochromic properties of the PS domain will be evaluated by using a scanning nearfield optical microscope.

关键词： Nano-structure thin polymer film Scanning nearfield optical microscope (SNOM)

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