Structure and phase transitions in poly(diethylsiloxane)
β Scribed by Ya. Tsvankin, D. ;Papkov, V. S. ;Zhukov, V. P. ;Godovsky, Yu. K. ;Svistunov, V. S. ;Zhdanov, A. A.
- Publisher
- John Wiley and Sons
- Year
- 1985
- Weight
- 1001 KB
- Volume
- 23
- Category
- Article
- ISSN
- 0360-6376
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Molecular motions in low molar mass (46200 g mol-') poly(diethylsi1oxane) (PDES) are studied by 2H NMR. From DSC measurements the existence of the crystalline phases a,, B, and a2, /I2, as well as a pronounced mesogenic phase a, , is clearly established. Based upon calculations of averaged field gra
SnP 2 O 7 is a member of the ZrP 2 O 7 family of materials, several of which show unusual thermal expansion behavior over certain temperature ranges and which show a number of displacive phase transitions on cooling from high temperature. Here we describe the structural properties of SnP 2 O 7 from
## Abstract The structure of poly(diethylsiloxane) (PDES) has been characterized using solidβstate NMR of ^17^O. The sample studied had a weightβaverage molecular weight of 2.45 Γ 10^5^. The sample was prepared by utilizing the cationic ringβopening polymerization of ^17^Oβenriched hexacyclotrisilo