By James C. Taylor
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Extra info for Advances in Chemistry Research, Volume 8
Zaikov GE//Chemical physics and mesoscopy. 2007. 9. №4. 415. , Guseva LN, Ershov YA // J. Physical Chemistry (russian). 82. № 9. p. 420. Perekalin VV ea, J. Common Chemistry. 1952. 22. №5. 821. //Chem. Berichte. 1912. 45. №13. P. 2910. //J. Amer. Chem. Soc. 1935. 57. №7. 1151. , Timmons K. Electronic absorption spectroscopy in organic chemistry. М. Mir, 1974. // J. Physical Chemistry (russian). 1956. 30. №5. P. 1028. Kogan IM. Dye’s chemistry (synthetic). М. ONTI, 1938. Vartanian AT//Izvestya USSR AS, physical (russian).
Both these band correspond to UV-band of a colorless product of distillation with the water steam, received in . In our case the product with these two UV-bands has been received without participation of water steam. Hence, the corresponding leyko-form cannot be explained chemical reaction of molecules of MG with water. Regeneration MG chromogene forms at immersing warmed films in water too corresponds to the effect which has been found out in . As a whole, character of spectral transformations of a MG film qualitatively corresponds to the transformations observed by us for films, containing rodamineы B and G.
ENTHALPY RELAXATION IN THE PMMA: EFFECT OF THE MOLECULAR WEIGHT In this study five different PMMA were used . The molecular weights, the polydispersity index and the glass transition temperature are reported in Table 5. 40 Maurizio Penco, Stefania Della Sciucca, Gloria Spagnoli et al. Table 5. Physical parameters of the investigated PMMA samples a) Commercial products. As reported in literature , the entanglement mass of PMMA ranges in the interval 5,800-10,100 Dalton, depending on the stereochemical composition.