1 / 3

Polysiloxane chains allow many degrees of freedom

Polysiloxane. Polysiloxane chains allow many degrees of freedom Si-O-Si bond is very bendable (Bond angle can vary from 135 to 180 C) O-Si-O bond is not flexible and can vary between 102 to 112 Therefore polysiloxanes can be made less or more flexible.

belden
Download Presentation

Polysiloxane chains allow many degrees of freedom

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Polysiloxane • Polysiloxane chains allow many degrees of freedom • Si-O-Si bond is very bendable (Bond angle can vary from 135 to 180 C) • O-Si-O bond is not flexible and can vary between 102 to 112 • Therefore polysiloxanes can be made less or more flexible

  2. Distorted Cis-Trans Planar Conformation in (NPCl2)n

  3. Conformational Structure (NPF2)n • Very high torsional mobility • Glass transition temperature: -96 C • Temperature range of elasticity: -70 to 250 C • Calculations involving the Vander Waals and Coulombic interactions for • (NPF2)n suggest that a torsional barrier to 360 C rotation of a skeletal bond in • (NPF2)n is less than 0.1 K Cal --- Lowest barrier known in any polymer.

More Related