Preparation of Telechelic Hydroxyl Low Molecular Weight Fluoropolymers

Preparation of telechelic hydroxyl low molecular weight fluoropolymers by reduction reaction was presented. The telechelic carboxyl low molecular weight fluoropolymers were chosen as raw materials which were prepared by oxidative degradation method. The molecular weights of telechelic carboxyl low m...

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Bibliographic Details
Published in:Key engineering materials 2017-08, Vol.753, p.93-98
Main Authors: Liao, Ming Yi, Li, Dong Han
Format: Article
Language:English
Subjects:
Aluminum
Aluminum hydrides
Chemical reduction
Fluoropolymers
Lithium aluminum hydrides
Low molecular weights
Metal hydrides
Molecular weight
NMR
Nuclear magnetic resonance
Raw materials
Viscosity
Viscous fluids
Weight reduction
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Summary:Preparation of telechelic hydroxyl low molecular weight fluoropolymers by reduction reaction was presented. The telechelic carboxyl low molecular weight fluoropolymers were chosen as raw materials which were prepared by oxidative degradation method. The molecular weights of telechelic carboxyl low molecular weight fluoropolymers were about 3700. Then, using lithium aluminum hydride reacted with carboxyl groups to prepare the telechelic hydroxyl low molecular weight fluoropolymers. The effects of reaction temperatures, reaction times, contents of solvent and lithium aluminum hydride were investigated in detail. The structures, Mn and dynamic viscosity of low molecular weight fluoropolymers were analyzed by FTIR, 1H-NMR, GPC and viscometer respectively. Finally telechelic hydroxyl low molecular weight fluoropolymers were prepared. The conversion rate of that reduction reaction was about 95%. The product was a viscous fluid with a dynamic viscosity of 48Pa·s at 50°C.
ISSN:1013-9826
1662-9795
1662-9795
DOI:10.4028/www.scientific.net/KEM.753.93