Durability and Free Volume in Polymeric Coatings Studied by Positron Annihilation Spectroscopy

Abstract:

• Periodical: Materials Science Forum (Volumes 445-446)
• Pages: 274-276
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.445-446.274
• Online since: January 2004
• Authors: H. Chen, R. Zhang, Ying Li, Jun Jie Zhang, Yi Chu Wu, T.C. Sandreczki, P.E. Mallon, Toshiyuki Ohdaira, Ryoichi Suzuki, X. Gu, T. Nguyen, Yan Ching Jean
• Keywords: Coating, Durability, Lifetime Spectroscopy, Photo-Degradation, Polymer, Slow Positron Beam

References

[1] H. Cao, R. Zhang, C.S. Sundar, J. -P. Yuan, Y. He, T.C. Sandreczki, Y.C. Jean, and B. Nielsen, Macromolecules 31 (1998), p.6627.

[2] Y.C. Jean, P.E. Mallon, R. Zhang, H. Chen, J. Zhang, Y. Li, and Y.C. Wu, in: “Principles and Applications of Positron and Positronium Chemistry”, Y.C. Jean, P.E. Mallon, and D.C. Schrader, Eds. (2003), World Sci. Pub., Singapore, pp.282-307.

DOI: 10.1142/9789812775610_0001

[3] R. Zhang, H. Chen, H. Cao, Y. He, J. -P. Yuan, T.C. Sandreczki, Y.C. Jean, R. Suzuki, T. Ohdaira, and B. Nelsen, Radiat. Phys. Chem. 58 (2000), p.639.

[4] H. Cao, R. Zhang, J. -P. Yuan, C. -M. Huang, Y.C. Jean, R. Suzuki, T. Ohdaira, and B. Nielsen, J. Phys.: Condens. Matter 10 (1998), p.10429.

DOI: 10.1088/0953-8984/10/46/011

[5] Y.C. Jean, R. Zhang, H. Cao, J. -P. Yuan, and C. -M. Huang, Phys. Rev. B. 56 (1997), p. R8459.

[6] J.S. Nico, D.W. Gidley, A. Rich, and P.W. Zitzewitz, Phys. Rev. Lett. 65 (1990), p.1344.

[7] S. Szpala, M.P. Petkov, and K.G. Lynn, Rev. Sci. Inst. 73 (2002), p.147.

[8] R. Suzuki, Y. Kobayashi, T. Mikado, M. Chiwaki, H. Ohgaki, and T. Yamazaki, Applied Surface Science 85 (1995).

[10] 5.

3 0 �3 (ns) Positron incident energy (keV) Epoxy I3 (%) �3.

[2] 85.

[4] 23.

[5] 18.

[5] 92.

[6] 54 R (Å) I3 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30.

39.

40.

41.

42.

43.

44.

45 Positron incident energy (keV) S parameter UV-313 Virgin 1 h 4 h 7 h 19 h 33 h 50 h 66 h 85 h.

[8] 27.

[6] 46.

[4] 83.

[3] 38.

[2] 13.

[1] 11.

0 0. 37 Mean depth (µm) Fig. 3 o-Ps lifetime (left scale) and intensity (right scale) vs positron incident energy in epoxy polymer for 85 hrs UV irradiation. Fig. 4 The S parameter vs positron incident energy for epoxy samples subjected to UVB-313 irradiation for different periods in an epoxy polymer.