Accession Number:

ADA458338

Title:

Chemical Modification of Fluorinated Polyimides: New Thermally Curing Hybrid-Polymers With POSS (PREPRINT)

Descriptive Note:

Journal Article

Corporate Author:

AIR FORCE RESEARCH LAB EDWARDS AFB CA

Report Date:

2006-03-15

Pagination or Media Count:

33.0

Abstract:

A series of four new end-capped and hydroxymethyl-functionalized polyimides were prepared. Through a two-step chemical modification process 3- aminopropylisobutyl-POSS was covalently attached to the polymer backbone. POSS loading levels as high as 40 wt- could be obtained while maintaining excellent processability and optical clarity of thin films. Concurrent attachment of either a cyanate ester or hydroxyethyl methacrylate HEMA group afforded processable POSS-polyimides that underwent thermal curing to yield solvent resistant films, both having final Tgs of 251 C. Kinetic analysis of the cure reactions yielded energy of activations of 93 kJmol cyanate ester and 103 kJmol HEMA. Exposure of a POSS polyimide containing 31 wt- POSS to atomic oxygen displayed no measurable level of erosion relative to a Kapton standard.

Subject Categories:

  • Inorganic Chemistry
  • Physical Chemistry
  • Polymer Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE