Copolymers of methyl methacrylate and N‐cyclohexyl maleimide: Preparation and properties

Abstract

Copolymers of methyl methacrylate (MMA) and N-cyclohexyl maleimide (NCM) with low intrinsic viscosity were obtained when free-radical copolymerization was carried out in benzene solution. Copolymers containing 0-30 wt.-% NCM were also prepared by bulk polymerization as cast acrylic sheets and had much higher intrinsic viscosity. An increase in NCM content in copolymers resulted in an increase in thermal stability and modulus and a decrease in tensile strength, strain at break, impact strength of unnotched specimen and light transmittance. The increase in haze was marginal up to 15 wt.-Yo of NCM. A decrease in water absorption was observed with an increase in NCM content. ZUSAMMENFASSUNG:Durch radikalische Copolymerisation von Methylmethacrylat (MMA) und N-Cyclohexylmaleimid (NCM) in Benzol wurden Copolymere mit niedriger Grenzviskositat erhalten. Copolymere mit NCM-Gehalten zwischen 0 und 30 Gew.-% und wesentlich hoheren Grenzviskositaten wurden auch mittels Copolymerisation in Substanz in Form von Platten hergestellt. Eine Erhohung des NCM-Gehaltes bewirkte eine Zunahme der thermischen Stabilitat, des E-Moduls und der Wasseraufnahme sowie eine Abnahme der Zugfestigkeit, der Bruchdehnung, der Schlagzahigkeit gekerbter Probekorper und der Lichtdurchlassigkeit. Die Triibung nahm bis zu einem NCM-Gehalt von 15 Gew.-To nur geringfugig zu.

Graft copolymerization of methylmethacrylate with N‐substituted maleimide‐styrene copolymer by ATRP

“…18,19 It is wellknown that high dipole moment of the maleimide unit at right angle to the backbone and its cyclic structure impart great stiffness to the polymer chain, resulting in high T g due to the presence of imide rings in the backbone. These polymers find application in several fields related to their dielectric and nuclear magnetic relaxational characteristics, asymmetric induction polymerization, or Langmuir-Blodgett film forming properties.…”

Synthesis and characterization of terpolymer of N‐cyclohexylmaleimide, methyl methacrylate, and acrylonitrile

“…While increasing T g , however, the higher backbone rigidity also inevitably causes the decrease of the mechanical properties such as tensile strength and impact strength. 6 Poly(methyl methacrylate) (PMMA) is the most popular commercial polymer in the acrylic industry used for glazing and optical application because of its excellent properties such as colorlessness, high light transmittance, weather resistance, light weight, and dimensional stability. However, PMMA has a poor heat resistance and the glass transition temperature (T g ) of conventional PMMA is generally between 85 and 1058C that is unsatisfactorily low.…”

Graft copolymerization of methyl methacrylate with an N‐substituted maleimide–liquid‐crystalline copolymer by atom transfer radical polymerization

“…In recent years, N ‐substituted maleimide (MI) monomers, such as N ‐phenylmaleimide and N ‐hydroxyphenylmaleimide have become important as they contain a rigid planar ring and can effectively enhance the glass‐transition temperature ( T g ) and degradation temperature of copolymers 17, 18. The incorporation of N ‐substituted maleimides into polymer chains, as in thermoplastic resins, improves the heat resistance, solvent resistance, chemical stability, and other properties of these materials.…”