Various polyheteroarylenes have been studied with regard to their physical properties before and after treatment with supercritical carbon dioxide (sc-CO 2). Thus, the study of dependence of glass transition temperature and free volume of polymer matrix on the conformational rigidity showed that the process of swelling in sc-CO2 is influenced by the residual solvent and by the formation of possible hydrogen bonds between CO2 and amide groups in the polymer chain.
Gallyamov, M.O., Vinokur, R.A., Nikitin, L.N., Said-Galiyev , E.E., Khokhlov, A.R. and Schaumburg, K. ( 2002). Poly(methyl methacrylate) and Poly(butyl methacrylate) Swelling in Supercritical Carbon Dioxide and the Formation of a Porous Structure . Polym. Sci. Ser. A, 44: 581-592.
2.
Said-Galiev, E.E., Vygodskii, Ya.S. , Nikitin, L.N., Vinokur, R.A., Khokhlov, A.R., Pototskaya, I.V., Kireev, V.V. and Schaumburg , K. (2004). Synthesis of Polyimides in Supercritical Carbon Dioxide, Polym. Sci. Ser. A, 46: 377-380.
3.
Said-Galiyev, E.E., Vygodskii, Y.a.S., Nikitin, L.N., Vinokur, R.A., Gallyamov, M.O., Pototskaya, I.V., Kireev, V.V., Khokhlov, A.R. and Schaumburg , K. (2003). Synthesis of Polyimides in Supercritical Carbon Dioxide. J. Supercrit. Fluids, 27: 121-130.
4.
Ronova, I.À. , Nikitin, L.N., Sinitsyna, O.V. and Yaminsky, I.V. ( 2008). The Effect of Supercritical Carbon Dioxide on Polymers: an Efficient Method to Enlarge the Free Volume . Phys. Him. Process. Mater., 4: 54-59.
5.
Bruma, M., Hamciuc, E., Sava, I., Hamciuc, C., Iosip, M.D. and Robison, J. ( 2003). Compared Properties of Polyimides based on Benzophenonetetracarboxylic Dianhydride, Rev. Roum. Chim., 48: 629-638.
6.
Sava, I. and Bruma, M. ( 2004). Polyamide-esters containing Benzonitrile or Isopropylidene Units in the Main Chain, Rev. Roum. Chim., 49: 69-76.
7.
Bruma, M., Sava, I., Hamciuc, E., Hamciuc, C. and Damaceanu, M.D. ( 2006). Synthesis and Characterization of Heterocyclic Polyimides as High Performance Materials with Potential Applications in Rf Mems Devices Processing, RomanianJ. Inform. Sci. Technol. , 9: 277-284.
8.
Pavlova, S.S.A. , Ronova, I.A., Timofeeva, G.I. and Dubrovina , L.V. ( 1993). On Flexibility of Cyclochain Polymers, J. Polym. Sci. Polym. Phys. Ed., 31: 1725-1757.
9.
Dewar, M.J.S. , Zoebisch, E.F., Healy, E.F. and Stewart, J.J. (1985). Development and Use of Quantum Mechanical Molecular Models. 76. AM1: a New General Purpose Quantum Mechanical Molecular Model, J. Am. Chem. Soc., 107: 3902-3909.
10.
Rozhkov, E.M. , Schukin, B.V. and Ronova I.A. ( 2003). Methods for the Calculation of Occupied Volumes in Glassy Polymers: the Lattice Integration and the Monte Carlo Method, Eur. J. Chem. (Central European Science Journals), 1: 402-426.
11.
Askadskii, A.A. and Kondrashchenko , V.I. (1999). Computer Material Science of Polymers, NauchnyiMir, Moscow.
12.
Nikitin, L.N. , Said-Galiyev, E.E., Vinokur, R.A., Khokhlov, A.R., Gallyamov, M.O. and Schaumburg , K. ( 2002). Poly(methyl methacrylate) and Poly(butyl methacrylate) Swelling in Supercritical Carbon Dioxide, Macromolecules, 35: 934-940.
13.
Nikitin, L.N. , Marat, O., Gallyamov , M.O., Rostislav, A., Vinokur, R.A., Nikolaev, A.Yu. , Said-Galiyev, E.E., Khokhlov, A.R., Jespersen, H.T. and Schaumburg , K. ( 2003). Swelling and Impregnation of Polystyrene using Supercritical Carbon Dioxide , J. Supercrit Fluids, 26: 263-273.
14.
Nikitin, L.N., Nikolaev, A.Yu. , Said-Galiev, E.E., Gamsasade, A.I. and Khokhlov, A.R. ( 2006). Formation of Pores in Polymers with Supercritical Carbon Dioxide, Supercrit. Fluids: Theory Pract., 1: 77-88.
15.
Berens, A.R. , Huvard, G.S., Korsmeyer, R.W. and Kunig, F.W. ( 1992). Application of Compressed Carbon Dioxide in the Incorporation of Additives into Polymers, J. Appl. Polym. Sci., 46: 231-242.
16.
Webb, K.F. and Teja, A.S. (1999). Solubility and Diffusion of Carbon Dioxide in Polymers, Fluid Phase Equilibria , 158-160: 1029-1034.
17.
Von Schnitzler, J. and Eggers, R. (1999). Mass Transfer in Polymers in a Supercritical CO2 - Atmosphere, J. Supercrit. Fluids , 16: 81-92.
18.
Crank, J. ( 1975). The Mathematics of Diffusion, Clarendon Press, Oxford.
19.
Ronova, I.A. and Pavlova, S.S.A. (1998). The Effect of the Conformational Rigidity on Several Physical Properties of Polymers, High Perform . Polym., 10: 309-329.
20.
Ronova, I.A. , Vasilyuk, A.N., Gaina, C. and Gaina, V. (2002). The Effect of the Conformational Rigidity on the Initial Decomposition Temperature of some Heterocyclic Polyimides, High Perform. Polym., 14: 195-208.
21.
Hamciuc, C., Hamciuc, E., Bruma , M. and Ronova, I.A. (2005). Effect of Conformational Rigidity on Physical Properties of some Poly(imide-amide)s containing Dimethylsilane Units, J. Macromol. Sci. A, 42: 61-69.
22.
Hamciuc, C., Hamciuc, E. and Ronova I.A. (2006). Influence of the Conformational Parameters on Physical Properties of some Aromatic Poly(1,3,4-oxadiazole-ether)s , Bull. Inst. Polit. Iasi. Ser. Chim., 51: 67-75.
Tsivintzelis, I., Angelopoulou, A.G. and Panayiotou , C. (2007). Foaming of Polymers with Supercritical CO2: An Experimental and Theoretical Study, Polymer, 48: 5928-5939.
25.
Kazarian, S.G., Vincent, M.F., Bright, F.V., Liotta, C.L. and Eckert, C.A. (1996). Specific Intermolecular Interaction of Carbon Dioxide with Polymers, J. Am. Chem. Soc., 118: 1729-1736.