Thermodynamic Properties of a First-Generation Siloxane Dendrimer with Terminal Trimethylsilyl Groups

被引：6

作者：

Markin, A., V ^{[1
]}

Sarmini, Yu A. ^{[1
]}

Sologubov, S. S. ^{[1
]}

Smirnova, N. N. ^{[1
]}

Boldyrev, K. L. ^{[2
,3
]}

Tatarinova, E. A. ^{[2
]}

Meshkov, I. B. ^{[2
]}

Muzafarov, A. M. ^{[2
,3
]}

机构：

[1] Lobachevsky State Univ, Nizhnii Novgorod 603950, Russia

[2] Russian Acad Sci, Enikolopov Inst Synthet Polymer Mat, Moscow 117393, Russia

[3] Russian Acad Sci, Nesmeyanov Inst Organoelement Cpds, Moscow 119991, Russia

来源：

RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A | 2020年 / 94卷 / 02期

基金：

俄罗斯科学基金会; 俄罗斯基础研究基金会;

关键词：

siloxane dendrimers; precision calorimetry; heat capacity; devitrification; thermodynamic functions; CARBOSILANE DENDRIMERS; HEAT; CALORIMETRY; GENERATIONS; POLYMERS;

D O I：

10.1134/S0036024420020260

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The temperature dependence of the heat capacity of a first-generation siloxane dendrimer with terminal trimethylsilyl groups is determined for the first time via high-precision adiabatic vacuum calorimetry in the temperature range of 6 to 347 K, and by differential scanning calorimetry in the temperature range of 330 to 410 K. An anomalous change in heat capacity is detected in the range of T = 42-76 K. A transition is observed in the range of T = 137-153 K, due to devitrification of the dendrimer. The thermal stability of the compound is studied via thermogravimetric analysis. The obtained experimental data are used to calculate standard thermodynamic functions of the dendrimer in the temperature range T -> 0 to T = 400 K, along with the standard entropy of its formation at T = 298.15 K.

引用

页码：240 / 248

页数：9

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