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Title: Analysis of Radiation Induced Degradation in FPC-461 Fluoropolymers by Variable Temperature Multinuclear NMR

Abstract

Solid state nuclear magnetic resonance techniques have been used to investigate aging mechanisms in a vinyl chloride:chlorotrifluoroethylene copolymer, FPC-461, due to exposure to {gamma}-radiation. Solid state {sup 1}H MAS NMR spectra revealed structural changes of the polymer upon irradiation under both air and nitrogen atmospheres. Considerable degradation is seen with {sup 1}H NMR in the vinyl chloride region of the polymer, particularly in the samples irradiated in air. {sup 19}F MAS NMR was used to investigate speciation in the chlorotrifluoroethylene blocks, though negligible changes were seen. {sup 1}H and {sup 19}F NMR at elevated temperature revealed increased segmental mobility and decreased structural heterogeneity within the polymer, yielding significant resolution enhancement over room temperature solid state detection. The effects of multi-site exchange are manifest in both the {sup 1}H and {sup 19}F NMR spectra as a line broadening and change in peak position as a function of temperature.

Authors:
; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
875965
Report Number(s):
UCRL-JRNL-207685
Journal ID: ISSN 0141-3910; PDSTDW; TRN: US200604%%277
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Journal Article
Journal Name:
Polymer Degradation and Stability
Additional Journal Information:
Journal Volume: 91; Journal ID: ISSN 0141-3910
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; AGING; AIR; DETECTION; IRRADIATION; LINE BROADENING; NITROGEN; NMR SPECTRA; NUCLEAR MAGNETIC RESONANCE; POLYMERS; RADIATIONS; RESOLUTION; VINYL CHLORIDE

Citation Formats

Chinn, S C, Wilson, T S, and Maxwell, R S. Analysis of Radiation Induced Degradation in FPC-461 Fluoropolymers by Variable Temperature Multinuclear NMR. United States: N. p., 2004. Web.
Chinn, S C, Wilson, T S, & Maxwell, R S. Analysis of Radiation Induced Degradation in FPC-461 Fluoropolymers by Variable Temperature Multinuclear NMR. United States.
Chinn, S C, Wilson, T S, and Maxwell, R S. 2004. "Analysis of Radiation Induced Degradation in FPC-461 Fluoropolymers by Variable Temperature Multinuclear NMR". United States. https://www.osti.gov/servlets/purl/875965.
@article{osti_875965,
title = {Analysis of Radiation Induced Degradation in FPC-461 Fluoropolymers by Variable Temperature Multinuclear NMR},
author = {Chinn, S C and Wilson, T S and Maxwell, R S},
abstractNote = {Solid state nuclear magnetic resonance techniques have been used to investigate aging mechanisms in a vinyl chloride:chlorotrifluoroethylene copolymer, FPC-461, due to exposure to {gamma}-radiation. Solid state {sup 1}H MAS NMR spectra revealed structural changes of the polymer upon irradiation under both air and nitrogen atmospheres. Considerable degradation is seen with {sup 1}H NMR in the vinyl chloride region of the polymer, particularly in the samples irradiated in air. {sup 19}F MAS NMR was used to investigate speciation in the chlorotrifluoroethylene blocks, though negligible changes were seen. {sup 1}H and {sup 19}F NMR at elevated temperature revealed increased segmental mobility and decreased structural heterogeneity within the polymer, yielding significant resolution enhancement over room temperature solid state detection. The effects of multi-site exchange are manifest in both the {sup 1}H and {sup 19}F NMR spectra as a line broadening and change in peak position as a function of temperature.},
doi = {},
url = {https://www.osti.gov/biblio/875965}, journal = {Polymer Degradation and Stability},
issn = {0141-3910},
number = ,
volume = 91,
place = {United States},
year = {Wed Oct 27 00:00:00 EDT 2004},
month = {Wed Oct 27 00:00:00 EDT 2004}
}