Premium
Preparation, characterization, and thermal properties of hydrophilic copolymers: p ‐chlorophenylmaleimides with hydroxylethyl methacrylate and β‐methyl itaconate
Author(s) -
Pizarro Guadalupe del C,
Marambio Oscar G,
JeriaOrell Manuel,
Huerta Margarita R,
Sánchez Julio,
Rivas Bernabé L,
Habicher Wolf D
Publication year - 2007
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.2256
Subject(s) - copolymer , polymer chemistry , thermal stability , monomer , glass transition , dispersity , methacrylate , reactivity (psychology) , polymer , materials science , thermal decomposition , methyl methacrylate , mole fraction , thermogravimetric analysis , proton nmr , chemistry , organic chemistry , medicine , alternative medicine , pathology , composite material
This work describes the synthesis, characterization, and thermal behavior of copolymers of p ‐chlorophenylmaleimide (Cl‐PhMI) with β‐methyl itaconate (β‐MHI) and 2‐hydroxyethyl methacrylate (HEMA). Copolymerization was carried out with a radical initiator by varying the feed mole fraction of Cl‐PhMI from 0.25 to 0.75. The copolymer composition was determined from the N/C ratio based on elemental analysis data and with 1 H NMR spectroscopy for poly(Cl‐PhMI‐ co ‐HEMA) using a proton signal attributed to the CH 3 of HEMA (δ = 0.7–1.4 ppm) and the area of aromatic ring protons (δ = 7.2–7.8 ppm), where the proton/area relationship confirmed the copolymer compositions calculated by elemental analysis. The monomer reactivity ratios r 1 and r 2 were determined using the Kelen–Tüdös method. These values demonstrated that copolymerization produced random copolymers with an alternation tendency. The molecular weight and polydispersity were also determined. The thermal behavior can be correlated with the copolymer composition. An increase of the thermal decomposition temperature occurred when the content of Cl‐PhMI increased. The glass transition temperature and thermal stability of poly(β‐MHI) or poly(HEMA) increased with an increasing amount of Cl‐PhMI in the polymer backbone. Copyright © 2007 Society of Chemical Industry