Influence of chain microstructure on thermodegradative behavior of furfuryl methacrylate‐N‐vinylpyrrolidone random copolymers by thermogravimetry

Abstract

SYNOPSISThe thermal behaviour of random copolymers of furfuryl methacrylate (F) and N-vinylpyrrolidone ( P ) was studied by means of dynamic thermogravimetric analysis (TGA) in the range 100-600°C. The dynamic experiments show that these copolymers exhibit two degradation steps in the intervals 260-320°C and 350-520°C, respectively. The normalized weight loss in the low temperature interval increases as the mole fraction of F in the copolymer mF increases, whereas an inverted trend in the high temperature interval is observed. The apparent activation energy E. of the first degradation step for copolymers prepared with different composition, was obtained according to the treatment suggested by Broido. A plot of the values of E. versus the F diad molar fraction in the copolymer chains m F F gave a straight line that indicates that there is a direct relationship between the thermogravimetric behaviour of these systems and their corresponding microstructure, that is, the distribution of comonomeric units along the copolymers chains. The first decomposition step was also studied by isothermal TGA and a good linearity for the variation of the weight loss percentage AN' versus mF at least during the first 30 min of treatment was obtained. These results also indicate that from a kinetic point of view the isothermal degradation in these conditions follows a first order behaviour and the corresponding reaction rate constants increase linearly with ~F F .

Synthesis, characterization, bioactivity and biocompatibility of nanostructured materials based on the wollastonite‐poly(ethylmethacrylate‐co‐vinylpyrrolidone) system

“…40,41 The DSC analysis of the copolymer specimens without the ceramic component showed a unique T g at about 608C that is very close to the theoretical value for PEMA. 42 When the ceramic component is added the T g value shifts to 888C, suggesting that an interaction between the ceramic and the polymeric components does happen.…”

“…All the weight loss occurred in one single step at a relatively high temperature but the relative stabilization of thermal degradation with respect to pure homopolymers have been reported for several systems including methacrylate units 40,41 whereas the cleavage of the pyrrolidone ring that could be expected between 280 and 3008C has also been observed at greater temperatures as a consequence of the volatilization of the pyrrolidone residue that proceeds from polyenic sequences formed at those temperatures. 40,41 The DSC analysis of the copolymer specimens without the ceramic component showed a unique T g at about 608C that is very close to the theoretical value for PEMA.…”

“…The second event started at 2808C and extended to 375-4008C. The weight loss related to this event were 38, 28, and 15% for W15, W30, and W60, respectively, and is probably caused by the releasing of pyrrolidone side groups 40,41 and the depolymerization of the saturated products of the disproportion of poly(ethyl methacrylate) sequences in the copolymer chains. 52,53 From 375-3908C to 4608C a third step could be distinguished due to the decomposition of the polyenic sequences remaining from the poly(vinylpyrrolidone) moieties, into lowmolecular weight hydrocarbon compounds, 40,41 as well as the continuing depolymerization of the products of disproportion of poly(ethyl methacrylate).…”

Controlled Radical Polymerization of Furfuryl Methacrylate

“…Among all the CRP methods atom transfer radical polymerization (ATRP) is very promising as it can be applied to a wide range of monomers like (meth)acrylates and styrene derivatives and is tolerant to different functional groups present in monomer as well as in the initiator [2,3] . Furfuryl Methacrylate is a useful monomer, which is being used in coating and biomedical application 4,5 .…”

Atom‐Transfer Radical Copolymerization of Furfuryl Methacrylate (FMA) and Methyl Methacrylate (MMA): A Thermally‐Amendable Copolymer

“…Conventional radical polymerization of furfuryl methacrylate (FMA) leads to insoluble and gelled polymers even at low conversion, due to excessive chain transfer involving the reactive furfuryl group in the polymer and in the monomer 7, 11–13. This restricts the use of this polymer in adhesive and coating applications, as it is very difficult to handle highly viscous materials.…”