Segmental Dynamics of Ethylene Oxide-Containing Polymers with Diverse Backbone Chemistries
| Autor: | Quan Chen, Ralph H. Colby, Joshua Bartels, James Runt, Jing Han Helen Wang |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
chemistry.chemical_classification
Ethylene Polymers and Plastics Ethylene oxide Organic Chemistry Ether 02 engineering and technology Dielectric Polymer 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Inorganic Chemistry Polyester chemistry.chemical_compound Hydrocarbon chemistry Polymer chemistry Materials Chemistry Polyphosphazene 0210 nano-technology |
| Zdroj: | Macromolecules. 49:1903-1910 |
| ISSN: | 1520-5835 0024-9297 |
| DOI: | 10.1021/acs.macromol.5b02423 |
| Popis: | The dielectric response of seven nonionic ethylene oxide-containing polymers are investigated. Four different backbone chemistries are considered, including polymethacrylate, polyester ether, polyphosphazene, and polysiloxane. The chemistry of the backbone and the linking chemistry to incorporate ether oxygen (EO) groups dramatically affect polymer segmental dynamics. The Tg of the inorganic backbone polymers is ∼15 °C lower than that of the PEO homopolymer. Polysiloxanes exhibit the lowest Tg of −86 °C when attached with pendent −(CH2–CH2–O)4–CH3 groups. The strength of the alpha relaxation is the same for the hydrocarbon backbone polymers (Δe = 10), whereas the dielectric constants of inorganic polymers with short pendent groups is lower (Δe = 3). The difference in relaxation strengths is due to restricted motion of ether oxygens close to the backbone. This effect diminishes as the relative backbone concentration is decreased by increasing the pendent EO length. As pendent EO chain length is increased, ... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|