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Sequential interpenetrating polymer networks of novolac resin and poly( n ‐butyl methacrylate)
Author(s) -
Goswami Sudipta,
Chakrabarty Debabrata
Publication year - 2006
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/app.24182
Subject(s) - thermogravimetric analysis , materials science , differential scanning calorimetry , glass transition , toughness , scanning electron microscope , composite material , ultimate tensile strength , methacrylate , polymer , dynamic mechanical analysis , polymer chemistry , methyl methacrylate , modulus , chemical engineering , copolymer , physics , engineering , thermodynamics
Novolac resin/poly( n ‐butyl methacrylate), P( n ‐BMA), sequential interpenetrating polymer networks (both semi and full types) were prepared and characterization of the various compositions (up to 40% by weight of PF incorporation) was performed in terms of mechanicals, namely, ultimate tensile strength (UTS), percentage elongation at break (% E.B.), modulus, and toughness. Thermal properties were studied by differential scanning calorimetry and thermogravimetric analysis (TGA). Crosslink densities of the IPNs were calculated using Flory‐Rehner equation. The morphological features were studied through scanning electron microscope. There was a gradual decrease of modulus and UTS with consequent increases in % E. B. and toughness with increasing proportions of P( n ‐BMA). An inward shifting and lowering of the glass transition temperatures of the IPNs (compared with that of pure phenolic resin) with increasing proportions of P( n ‐BMA) were observed. The TGA thermograms exhibit two‐step degradation patterns. A typical cocontinuous bi‐phasic morphology is evident in the micrographs. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 4030–4039, 2006