Films with special properties (e.g., water-repellent films, optical films, anti-reflection films, and flexible films) are referred to as functional films. Recently, there has been interest in fine patterning methods for film fabrication. In particular there have been many studies that use a UV nanoi...
Films with special properties (e.g., water-repellent films, optical films, anti-reflection films, and flexible films) are referred to as functional films. Recently, there has been interest in fine patterning methods for film fabrication. In particular there have been many studies that use a UV nanoimprint process involving a UV curing method. In this paper, a polymer film was fabricated by the UV nanoimprint process with a micro-pattern, and its durability was evaluated by a wear test and a nano-indentation test. The film mechanical properties (such as coefficient of friction, hardness, and modulus of elasticity) were measured. Moreover, the choice of PUA type resin used in the UV nanoimprint process was confirmed to impact the durability of the thin film. Despite making the polymer film samples using the same method and PUA type resin, different coefficient of friction, hardness, and modulus of elasticity values were obtained. PUA 4 resin had the most favorable coefficient of friction, hardness, and modulus of elasticity. This material is predicted to produce a high durability functional film.
Films with special properties (e.g., water-repellent films, optical films, anti-reflection films, and flexible films) are referred to as functional films. Recently, there has been interest in fine patterning methods for film fabrication. In particular there have been many studies that use a UV nanoimprint process involving a UV curing method. In this paper, a polymer film was fabricated by the UV nanoimprint process with a micro-pattern, and its durability was evaluated by a wear test and a nano-indentation test. The film mechanical properties (such as coefficient of friction, hardness, and modulus of elasticity) were measured. Moreover, the choice of PUA type resin used in the UV nanoimprint process was confirmed to impact the durability of the thin film. Despite making the polymer film samples using the same method and PUA type resin, different coefficient of friction, hardness, and modulus of elasticity values were obtained. PUA 4 resin had the most favorable coefficient of friction, hardness, and modulus of elasticity. This material is predicted to produce a high durability functional film.
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문제 정의
In order to test the durability of a polymer film with micro-patterns, a thin film was manufactured using the UV nano imprint process. The goal of the test is the comparison of PUA type resin which is excellent in flexibility and mainly used in display and semiconductor industry. On the same PET film, we used four kinds of PUA type resins having different viscosity and surface energies.
제안 방법
The film wear characteristics were evaluated by a reciprocating and pin-on-disc test. A nano-indentation test was performed to evaluate film hardness. The most durable polymer film had the lowest friction coefficient and highest modulus of elasticity[3].
In this experiment, the surface of the polymer film was randomly indented at 3 - 5 points by the indenter. In order to reduce the effect of film material, the polymer film was fabricated to have a thickness of 20 or more and the test was carried out on the polymer film with a micro-pattern. As shown in Table 3, the maximum load applied by indenter tip after contact with the surface was set to 5 mN, and the Poisson's ratio was set to 0.
In this study, polymer films with micro-patterns were formed on PET film using the UV nanoimprint process. The mechanical properties of four different types of PUA resins were obtained.
In this study, two wear tests were performed: a reciprocating wear test (linear motion) and a pin-on-disc test (rotary motion). The reciprocating wear test, as shown in Fig.
To determine the durability of the manufactured polymer film sample, the reciprocating test and pin-on-disc test were both conducted during the wear test and the mechanical properties of polymer films were compared and analyzed using a nano-indenter. The micro-pattern, having a pillar structure of 5 um in diameter, 10 in height and 40 in pitch, was constructed on the PET film.
대상 데이터
The reciprocating test was conducted in accordance with ASTM G133 standards. This test uses a counterpart material known as high carbon chromium bearing steel (SUJ-2) in the upper ball shape, 5 mm in diameter. As shown in Table 2, the test load was 2 N, the reciprocating frequency was 1 Hz (reciprocates once per second), the reciprocating distance was 10 mm, and the test time was 60 seconds.
데이터처리
Polyurethane acrylate (PUA) type resins were cured on PET films by UV light. The film wear characteristics were evaluated by a reciprocating and pin-on-disc test. A nano-indentation test was performed to evaluate film hardness.
이론/모형
In this study, the UV nanoimprint process (a next generation micro-patterning method) is used to create a micro-patterned film. Both wear and nano-indentation tests were performed to investigate the durability of the micro-patterned thin film.
Depending on the energy source, the polymer curing method is either heating or ultraviolet. In this study, the UV nanoimprint process with a UV curing method was used to create a polymer film[4-5].
3 shows the counterpart material of the equipment used for each wear test, the ball type counterpart of reciprocating test and the pin type counterpart of pin-on-disc test. The reciprocating test was conducted in accordance with ASTM G133 standards. This test uses a counterpart material known as high carbon chromium bearing steel (SUJ-2) in the upper ball shape, 5 mm in diameter.
성능/효과
4 or higher. In conclusion, PUA 1, PUA 3, and PUA 4 showed better wear resistance than PUA 2.
후속연구
However, PUA type 4 resin had a high Young's modulus value (over 3 GPa), thus is predicted to greatly improve the durability of a PUA type resin. Overall, this study revealed that wear tests and nano-indentation tests can be helpful to determine the durability of polymer film.
참고문헌 (14)
Xia, Y., Yang, P., Sun, Y., Wu, Y., Mayers, B., Gates, B., Yin, Y., Kim, F., and Yanm H., “One-Dimensional Nanostructures: Synthesis, Characterization, and Applications,” Advanced materials, Vol. 15, No. 5, pp. 353-389, 2003.
Park, K. S., Lee, K. S., Sung, M. M., "Soft Lithographic Methods to Micro/Nanofabrication," Polymer Science and Technology, Vol. 23, No. 6, pp. 629-635 2012.
Guo, L. J., “Nanoimprint lithography: methods and material requirements,” Advanced Materials, Vol. 19, No. 4, pp. 495-513, 2007.
Kooy, N., Mohamed, K., Pin, L. T., and Guan, O. S., "A review of roll-to-roll nanoimprint lithography," Nanoscale Research Letters, Vol. 9, NO. 1, pp. 1-13, 2014.
Hagberg, E. C., Malkoch, M., Ling, Y., Hawker, C. J., and Carter, K. R., “Effects of modulus and surface chemistry of thiol-ene photopolymers in nanoimprinting,” Nano letters, Vol. 7, No. 2, pp. 233-237, 2007.
Rutherford, K. L., and Hutchings, I. M., "A micro-abrasive wear test, with particular application to coated systems," Surface and Coatings Technology, Vol 79, No. 1-3, pp. 231-239, 1996.
Kim, J. W., Ha, S. H., Kim, S. J., Kim, C. U., and Song, J. I., “Structural analysis and wearability evaluation of a vehicle's swash plate A/C compressor,” Journal of the Korean Society of Manufacturing Process Engineers, Vol. 12, No. 5, pp. 109-115, 2013.
Myshkin, N. K., Petrokovets, M. I., and Kovalev, A. V., "Tribology of polymers: Adhesion, friction, wear, and mass-transfer," Tribology International, Vol. 38, NO. 11-12, pp. 910-921, 2005.
Hahn, J. H., “Nanoindentation experiments on some thin films on silicon,” Journal of the Korean Ceramic Society, Vol. 37, No. 6, pp. 596-603, 2000.
Oliver, W. C., and Pharr, G. M., "An improved technique for determining hardness and elastic modulus using load and displacement sensing indentation experiments," Journal of materials research, Vol. 7, No. 6, pp. 1564-1583, 1992.
Han, J. H., Lee, G. R., Kim, G. S., and Lee, S. Y., “Principal and applications of nanoindentation test,” Journal of the Korean Society for Precision Engineering, Vol. 19, No. 3, pp. 19-26, 2002.
Jeon, E. C., Kim, J. H., and Je, T. J., “Prediction of State of Cutting Surfaces of Polymers by Analysis of Indentation Load-depth Curve,” Journal of the Korean Society of Manufacturing Process Engineers, Vol. 10, No. 4, pp. 76-81, 2011.
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