Influence of C₆₀Fullerene on the Oxidative Degradation of a Free Radical Poly(Methyl Methacrylate)

Radical scavenging efficiency of different fullerenes C60–C70 and fullerene soot

“…The stabilizing activity of fullerenes C 60 , C 60 / C 70 and C 70 , has been shown to be comparable to the activity of well-known hindered phenolic stabilizers, by means of model reactions of cumene and styrene initiated oxidation as well as in accelerated tests of polystyrene (PS) and polydimethylsiloxane (PDMS) rubber with fullerene moieties [34,35]. The stabilizing effect of fullerenes C 60 and C 70 was also shown in the thermal and thermo-oxidative degradation of poly(2,6-dimethyl-1,4-phenylene oxide) and its blends [36], natural rubber (cis-1,4-polyisoprene) and synthetic cis-1,4-polyisoprene [37], isotactic polypropylene [38], poly(methyl methacrylate) (PMMA) [39][40][41][42][43][44], poly(n-alkyl acrylate)s [45], and polyamide 6 [46].…”

Synthesis and Properties of [60] Fullerene-Polymethyl Methacrylate Conjugates in Supercritical Carbon Dioxide

“…During the oxidative degradation in air of PMMA, three processes occur practically simultaneously: thermal degradation or scission of chains; oxidation, or insertion of oxygen atoms in the polymer chains and in products of the degradation; and a sublimation of degradation products. [19] The TG spectrum of PMMA in Figure 5(a) shows two onset temperatures, at 166.29 C and 360.26 C, respectively, and end-set temperature at 441.42 C. The thermogram indicates 20% thermal degradation of polymer at 228.12 C with 0.0069 mg= C decomposition rate, 40% degradation at 276.24 C with 0.029 mg= C decomposition rate, and 60% and 80% degradation at 320.02 C and 403.46 C with 0.0321 mg= C and 0.0168 mg= C decomposition rates, respectively. At 600 C, 0.96% residues are found (see Table II).…”

“…13 C NMR spectra were also recorded on the Brucker Av400 and C 6 D 6 was used as a solvent. Simultaneous differential thermogravimetric analysis (TG) was performed by using a Netzsch-Geratebau thermal analyzer model STA-409 in static air at 25 C=10 (K=min)=1000 C. [19] …”

Influence of sublimation of destruction products on the pattern of DSC thermograms of polymeric materials

“…Mean while, these processes may be of certain interest for both fundamental and applied science. Our experi mental data on the topic were somewhat isolated and comprised only a small and by no means the majority of corresponding publications [1][2][3]. At the same time, the retrospective analysis of earlier results, together with the unpublished data, made it possible to take a different view of some problems of thermal analysis of polymeric materials in general and the problems of interpretation of DSC thermograms in the studies of degradation processes in particular.…”