Thermal Stability of Fluorinated Polydienes Synthesized by Addition of Difluorocarbene

Journal Article · Sun Jan 01 04:00:00 EST 2012 · Macromolecular Chemistry and physics

DOI:https://doi.org/10.1002/macp.201100548· OSTI ID:1040743

Huang, Tianzi ^[1]; Wang, Xiaojun ^[2]; Malmgren, Thomas W ^[2]; Hong, Kunlun ^[2]; Mays, Jimmy ^[2]

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1. University of Tennessee, Knoxville (UTK)
2. ORNL

Linear PCHD and polyisoprenes with different microstructures and molecular weights are synthesized and chemically modified to improve their thermal and chemical stability by forming a three-membered ring structure containing two C-F bonds. Pyrolysis of these fluorinated polydienes proceeds through a two-stage decomposition involving chain scission, crosslinking, dehydrogenation, and dehalogenation. The pyrolysis leads to graphite-like residues, whereas their polydiene precursors decompose completely under the same conditions. The fluorination of PCHD enhances its thermal stability. The stronger C-F bond along with high strain of the three-membered ring structure and formation of relatively stable free radicals play an important role in the thermal stability of fluorinated polydienes.

• Research Organization: Oak Ridge National Laboratory (ORNL); Center for Nanophase Materials Sciences
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1040743
• Journal Information: Macromolecular Chemistry and physics, Journal Name: Macromolecular Chemistry and physics Journal Issue: 1 Vol. 213; ISSN 1022-1352
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
74 ATOMIC AND MOLECULAR PHYSICS
CHAINS
DEHALOGENATION
DEHYDROGENATION
FLUORINATION
GLASS
MOLECULAR WEIGHT
PYROLYSIS
RADICALS
RESIDUES
STABILITY
STRAINS
THERMAL GRAVIMETRIC ANALYSIS
THERMODYNAMIC PROPERTIES