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Grafting of oxazoline functional group to polycaprolactone
Author(s) -
John Jacob,
Tang Jian,
Bhattacharya Mrinal
Publication year - 1998
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19980314)67:11<1947::aid-app14>3.0.co;2-r
Subject(s) - polycaprolactone , oxazoline , grafting , polymer chemistry , gel permeation chromatography , molar mass distribution , intrinsic viscosity , materials science , monomer , fourier transform infrared spectroscopy , polyester , polymerization , chemistry , chemical engineering , polymer , composite material , organic chemistry , engineering , catalysis
A twin‐screw extruder was used to graft oxazoline reactive group onto polycaprolactone (PCL) by free radical initiation reaction. A low‐volatility oxazoline compound was used to facilitate a high‐temperature grafting reaction. The effect of melt temperature, screw speed, and initiator and monomer concentrations on graft content were evaluated. The graft content ranged from 0.7 to 2.6%. Increased melt temperature and reduced screw speed increased the graft content. Molecular weight and molecular weight distribution evaluated with the help of intrinsic viscosity and gel permeation chromatography measurements gave values that were close to that of the unmodified PCL. The oxazoline‐grafted polyester gave considerable increase in the tensile force when compared with that of pure PCL. The grafting reaction was confirmed using Fourier transform infrared spectroscopy and nuclear magnetic resonance techniques. A probable reaction mechanism for the grafting reaction is proposed. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 67:1947–1955, 1998