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Poly(Urea–Urethane) Synthesis by Miniemulsion Polymerization Using Microwaves and Conventional Polymerization
Author(s) -
Valério Alexsandra,
Fortuny Montserrat,
Santos Alexandre F.,
Araújo Pedro H. H.,
Sayer Claudia
Publication year - 2015
Publication title -
macromolecular reaction engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.37
H-Index - 32
eISSN - 1862-8338
pISSN - 1862-832X
DOI - 10.1002/mren.201400029
Subject(s) - miniemulsion , polymerization , materials science , polymer chemistry , polymer , chemical engineering , gel permeation chromatography , polyurethane , dynamic light scattering , step growth polymerization , nanoparticle , composite material , nanotechnology , engineering
Microwave irradiation has been an interesting alternative for heating systems of several chemical reactions. In this work, a comparative study between microwave reactions and conventional heating is evaluated. The effects of temperature, power, and polyol type on the synthesis of poly(urea–urethane) by step polymerization in miniemulsion are evaluated and the final polymer is analyzed by Fourier transform infrared spectroscopy, gel permeation chromatography, contact angle, and nanoparticles size and size distribution are characterized by dynamic light scattering. Polymerization under microwave irradiation have a higher reaction rate showing advantages of using microwaves in this miniemulsion step polymerization processes. In addition, microwave irradiation also affects particle size, the solubility of the polyurethane, and the urea/urethane ratio.