Kazushige Nagashima et al 2002 J. Phys.: Condens. Matter 14 11131 doi:10.1088/0953-8984/14/44/438
Kazushige Nagashima1, Yoshitaka Yamamoto2, Masayoshi Takahashi2 and Katsuto Ohtake2
Show affiliationsIn situ interferometric observation of the process of CO2 dissolving into PMMA (polymethyl methacrylate) was carried out at high pressure and room temperature, in view of the interest to polymer foam technology. By analysing interferograms, the phase shift of a laser beam transmitted though the sample (the phase is related to the dissolved gas content and polymer thickness) was obtained as a function of time and pressure. At constant pressure, the phase shift initially increased over time and reached a maximum value, and then decreased asymptotically to a constant value as equilibrium was approached. In addition, the equilibrium value of the phase shift increased with increase in pressure for pressures lower than the glass transition pressure Pg, and decreased at pressures higher than Pg. Thus, the optical properties exhibited during the process of the gas dissolving were drastically different for the glassy state and the rubbery state of the polymer.
62.50.-p High-pressure effects in solids and liquids
78.20.-e Optical properties of bulk materials and thin films
Issue 44 (11 November 2002)
Received 24 June 2002
Published 25 October 2002
Kazushige Nagashima et al 2002 J. Phys.: Condens. Matter 14 11131
D F Liu et al 2005 Nanotechnology 16 2665
W Liao 1989 J. Phys. A: Math. Gen. 22 L737
Wolfgang Birkfellner et al 2003 Phys. Med. Biol. 48 2665
Rainer Schödel et al 2008 J. Phys.: Conf. Ser. 131 012044
G J Morgan et al 1985 J. Phys. F: Met. Phys. 15 2157
Yueqiang Liu 2009 Plasma Phys. Control. Fusion 51 115006
D Bar-Moshe and M S Marinov 1994 J. Phys. A: Math. Gen. 27 6287
J. G. Kirk et al. 2000 ApJ 542 235
Hugo Nguyen et al 2006 J. Micromech. Microeng. 16 2369