Preparation and characterization of the copolymer containing N‐pyridyl bi(methacryl)imide unit

Abstract

ABSTRACT:The copolymer of methacrylic acid anhydride and N-2-pyridyl bi(methacryl)imide was prepared based on the reaction of polymethacrylic acid with 2-pyridylamine. The molecular structure was characterized by 1 H-NMR, FTIR, UV-Vis, and circular dichroism techniques. The physical properties of polymethacrylic acid change significantly after an introduction of 6 mol % N-2-pyridyl bi(methacryl)imide unit. In particular, the thermal degradation of the polymer was systematically studied in flowing nitrogen and air from room temperature to 800°C by thermogravimetry at a constant heating rate of 10°C/min. In both atmospheres, a four-stage degradation process of the copolymer of methacrylic acid anhydride and N-2-pyridyl bi(methacryl)imide was revealed. The initial thermal degradation temperature T d , and the first, second, and third temperatures at the maximum weight-loss rate T dm1 , T dm2 , and T dm3 all decrease with decreasing sample size or changing testing atmosphere from nitrogen to air, but the fourth temperature at the maximum weight-loss rate T dm4 increases. The maximum weight-loss rate, char yield at elevated temperature, four-stage decomposition process, and three kinetic parameters of the thermal degradation were discussed in detail. It is suggested that the copolymer of methacrylic acid anhydride and N-2-pyridyl bi(methacryl)imide exhibits low thermal stability and multistage degradation characteristics.

High‐resolution thermogravimetry of polyethersulfone chips in four atmospheres

“…The sensitivity was fixed at its default value of 1 in a temperature range of 25–790°C. The temperatures and activation energy of thermal degradation were determined using the techniques previously described 12–29. The degradation temperature T d was obtained by extrapolation of the initial degradation portion of the TG curve.…”

Structure and thermal degradation of poly(N‐phenyl acrylamide) and poly(N‐phenyl methacrylamide)

“…We maintain that the properties of the polyacrylamides may be greatly manipulated by varying the substituents on the nitrogen atoms, to offer exciting possibilities for the development of new polymers. Although numerous investigations on the synthesis, structure, properties, and applications of the liquid crystalline poly(cyano‐biphenyl (meth)acrylate) and poly(alkoxy‐biphenyl (meth)acrylate) are cited in the literature,3 only a few studies on the synthesis of poly( N ‐cyano‐/alkoxy‐biphenyl (meth)acrylamide), N ‐2‐pyrimidyl, and N ‐2‐pyridyl acrylamide copolymers have been reported 3–5. Furthermore, very few reports concerning poly( N ‐phenyl (meth)acrylamide) have been found.…”

“…Although numerous investigations on the synthesis, structure, properties, and applications of the liquid crystalline poly(cyano-biphenyl (meth)acrylate) and poly(alkoxy-biphenyl (meth)acrylate) are cited in the literature, 3 only a few studies on the synthesis of poly(N-cyano-/alkoxy-biphenyl (meth)acrylamide), N-2-pyrimidyl, and N-2-pyridyl acrylamide copolymers have been reported. [3][4][5] Furthermore, very few reports concerning poly(N-phenyl (meth)acrylamide) have been found. To our knowledge no data about the thermal degradation and kinetics of poly(N-phenyl (meth)acrylamide) have been reported in the literature.…”