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Year 2007, Month 10 (Section Full Articles, Page 1991)

Thermodynamic properties of carbosilane dendrimers of the seventh and ninth generations with terminal butyl groups in the temperature range from T → 0 to 600 K

N. N. Smirnova, O. V. Stepanova, T. A. Bykova, A. V. Markin, E. A. Tatarinova, and A. M. Muzafarov

Temperature dependences of the heat capacity of carbosilane dendrimers with butyl terminal groups of the seventh and ninth generations were determined in the temperature range from 6 to 600 K by precision adiabatic vacuum calorimetry and differential scanning (dynamic) calorimetry. The physical transitions were revealed and their thermodynamic characteristics were analyzed. The experimental data obtained were used to calculate the standard thermodynamic functions C_p(T ), H°(T ) – H°(0), S°(T ), and G°(T ) – H°(0) for the temperature range from T → 0 to 600 K. The thermodynamic function—molar weight isotherms for the dendrimers of the third—ninth generations with terminal butyl groups in the glassy and highly elastic state are linear.

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