TY  - EJOU
AU  - SAXENA, SAURABH 
AU  - MALIK, PRATEEK 
AU  - SESHADRI, GEETHA 
AU  - TYAGI, AJAY K. 
AU  - MANDAL, UTTAM KUMAR 

TI  - A Study on the Effect of Reaction Parameters on Viscosity and Molecular Weight of Hexafluoropropylene (HFP) based Perfluoropolyethers (PFPEs)
T2  - Journal of Polymer Materials

PY  - 2019
VL  - 36
IS  - 1
SN  - 0976-3449

AB  - Medium molecular weight liquid perfluoropolyethers (840 u to 1372 u) were synthesized by
photopolymerization of hexafluoropropylene (HFP) in the presence of oxygen. Effects of
various reaction parameters such as temperature, pressure, UV wattage and reaction time
on yield, viscosity and molecular weight of PFPEs were studied. Out of all the parameters,
the effect of reaction temperature was found the most significant on molecular weight of
PFPEs. By increasing reaction temperature, viscosity and molecular weight of PFPEs where
decreased. By increasing the wattage of the lamp, viscosity and molecular weight of PFPEs
where also decreased. PFPEs obtained from reactions were subjected to FTIR and <sup>19</sup>F-NMR
analysis for structural confirmation.
KW  - Hexafluoropropylene
KW  -  Bulk polymerization
KW  -  Photopolymerization
KW  -  Perfluoro polyethers
KW  -  Acyl fluorides

DO  - 10.32381/JPM.2019.36.01.4