Thermogravimetric analysis styrenes

Fig. 8. Thermogravimetric analysis of polymers and copolymers of styrene in nitrogen at 10°C/min A represents PS B, poly(vinyltoluene) C, poly(a-methylstyrene) D, poly(styrene-i (9-acrylonitrile), with 71.5% styrene E, poly(styrene-i (9-butadiene), with 80% styrene and F,...

Fig. 9. Thermogravimetric analysis of Poly(styrene), poly a-methylstyrene and copolymers...

Figure 1.17 Thermogravimetric analysis curves for styrene-acrylonitrile copolymers of different content of acrylonitrile (O) 11.1 wt%, (A) 24.0 wt%, (O) 35 wt%, (V) 57 wt%. Reproduced with permission from S. Irgashi and H. Kambe, Die Makromolekulare Chemie, 1964, 79,180. 1964, Wiley [28]...

Figure 5. Thermogravimetric analysis of cellulose acetate cellulose acetate-g-polystyrene oxycellulose-g-poly-styrene.

The reaction of carbenes with olefins to form cyclopropyl derivatives has been used to modify elastomers. Pinazzi and Levesque and Berentsvich et al. found that carbene addition had a significant influence on the properties of polydienes. Thermogravimetric analysis (TGA), flammability and oil resistance in NR and dichlorocarbene modified styrene butadiene rubber (DCSBR) blends were investigated by thermogravimetrie analysis as a funetion of different composition. The TGA plots confirmed the better thermal stability and flame resistance of DCSBR as well as its blends with NR. The amount of DCSBR in the blend significantly affected the properties of blends. 

Figure 13 Thermogravimetric analysis of styrene monomer 19 and polymer 20.

Thermogravimetric analysis has also been coupled with gas chromatography /mass spectrometry and with gas chromatography to obtain information on styrene-isoprene block copolymers. 

Figure 4. Thermal properties of aliphatic polycarbonates poly(propylene carbonate) (PPC) poly(l,2-butylene carbonate) (PBC) poly(l,2-hex-5-ene carbonate) (PHC) poly(styrene carbonate) (PSC). (a) Thermogravimetric analysis curves (samples were run under an N2 atmosphere with a heating rate of 20 °C/min). (b) Differential scanning calorimetry curves (samples were run under an N2 atmosphere with a heating and cooling rate of 10 °C/min data...

The situation becomes very different if the fullerene is covalently bonded to a polymer chain. Indeed, a decreased thermal stability of polystyrene (PS) containing covalently attached fullerenes has been reported and attributed to a preferential breaking of the chain—Cso bond [115, 116]. Thermogravimetric analysis (TGA) has shown that the thermal decomposition of a PS star with a Ca> core starts at about 100 °C before that of linear PS and that the thermal decomposition occurs in two steps. In addition, analysis of the volatile products by mass spectroscopy proves that styrene is produced in the low (around 350 °C) and in the high (around 500 °C) temperature domains whereas all the > is released during the low temperature step (Figure 5.5) [116-118]. 

Left) tensile mechanical behavior and (right) thermogravimetric analysis of the poly (styrene-co-butyl acrylate) copolymer matrix (a) and of the poly (styrene-co-butyl acrylate)-Laponite nanocomposite film (b). Reprinted from reference 44c with permission of Wiley-VCH,... 

Ramesan MT. Thermogravimetric analysis, flammability and oil resistance properties in natural rubber and dichlorocarbene modified styrene butadiene rubber blends. Reaa Funct Polym 2004 59(3) 267-274. 

Nakagawa and co-workers [49] applied Py-GC to a structural study of various chloromethyl substituted PS copolymers prepared by different methods and they applied thermogravimetric analysis to the dihydrochlorination and thermal degradation behaviour of these copolymers. Typical programs of styrene-DVB, styrene-chloromethyl styrene-DVB and chlorinated p-methyl styrene-DVB copolymers are shown in Figures 1.18 -1.20, respectively. 

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