Synthesis, Characterization, and Glass Transitions of Some Asymmetrically Substituted Poly(siloxanes)
| Autor: | Qionghua Shen, Leonard V. Interrante |
|---|---|
| Rok vydání: | 1997 |
| Předmět: |
chemistry.chemical_classification
Empirical equations Materials science Polymers and Plastics Organic Chemistry Cationic polymerization Polymer Ring-opening polymerization Characterization (materials science) Inorganic Chemistry Homologous series chemistry.chemical_compound chemistry Polymerization Polymer chemistry Materials Chemistry Glass transition |
| Zdroj: | Macromolecules. 30:5485-5489 |
| ISSN: | 1520-5835 0024-9297 |
| DOI: | 10.1021/ma970026j |
| Popis: | A homologous series of poly(n-alkylmethylsiloxanes), [SiMe(R)O]n, were prepared by cationic ring-opening polymerization (ROP) of cyclotrisiloxanes containing n-alkyl substituents, such as C2H5, n-C3H7, n-C4H9, n-C5H11, and n-C6H13, on the Si. The resultant polymers were characterized by NMR, GPC, and DSC measurements. All of these asymmetrically substituted polymers were obtained in high molecular weight form and were found to have an atactic configuration. Their glass transitions were found to increase smoothly from Et to n-Hex (i.e., −139, −120, −115, −111.9, and −108 °C, for Et to n-Hex, respectively). These Tgs are much lower than those of the corresponding polyolefins, [C(H)(R)CH2]n. Moreover, in the case of these polyolefins, the Tgs decrease continuously from R = Me to n-Hex. The calculated Tgs for the polysiloxanes that were obtained by using published empirical equations show the same general trend as the experimental values. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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