Poly heating scans

Fig. 6 a DSC cooling scans (10°Cmin ) for poly(e-caprolactone) (PCL) and poly(p-dioxanone) (PPDX) homopolymers, diblock copolymers and a 50/50 blend, b Subsequent heating scans (10 °Cmin 1). (From [103], Reproduced with permission of the Royal Society of Chemistry)... 

Figure 3. DSC heating scans (20°C/min) of the poly(2,6-dimethyl-2,4-pheny-1ene oxide) containing 2-oxazo1ine and bromobenzyl pendant groups. A) second heating scan (first heating scan up to 200 0 B) third heating scan C) fourth heating scan (after annealing 30 min. at...

Figure 2.13 DSC thermograms of PLA50 after 0,98, and 126 days in vitro degradation, (a) First heating, and (b) second heating. PIA, poly(lactic acid) DSC, differential scanning calorimetry. Li S., McCarthy S., 1999a. Further investigations on the hydrolytic degradation of poly (DL-lactide). Biomaterials, 20 (1) 35—44. Reprinted with permission.

The results of typical dsc heating scans after isothermal aging are shown in Figure 7 for poly(ether imide) (PEI) for various aging times (23). In this case, one sample was used for all experiments, and isothermal aging was performed in the dsc itself It is noted that if isothermal aging is performed in the dsc, isothermal calibration of the instrument must be performed. 

Figure 6. The influence of molecular weight on the phase behavior of poly(fii2), polyf6-6) and poly(6i8) (determined from second DSC heating scans).

Figure 8. The dependence of phase transition temperatures obtained from second DSC heating scan (a,d), cooling scan (b,e), and the enthalpy changes associated with their highest temerature mesophase of copolymers poly[(6z3)-co-( ]XA and polvr(6-6)-co-(6-iniXA (all with degrees of polymerization equal to 20).

Figure 5 DSC thermogram of poly[l,l -ferrocenylene( -/iexa-decyl)silyne] [1(16)] measured imder nitrogen at a heating rate of 10°C/min during the second heating scan after the sample had been annealed at 150°C for 10 min.

Fig. 13.7. Heat flux during heating of poly(ethylene terephthalate) (PET) at a constant rate in a differential scanning calorimeter (DSC), showing changes in specific heat at Tg, crystallization exotherm at Tc, and melting endotherm at I m.

Similar observations were reported for random poly(propylene isophthalate-co-adipate) (PPIAd) copolyesters [39]. For up to 60 mol% propylene adipate (PAd) imits in the copolyesters they formed PPI crystals. The copolymers with 70 or 80 mol% propylene adipate could not crystallize at room temperature, while that with 90 mol% PAd units formed PPAd crystals. The thermal stability of the samples was checked by TGA measurements in air by heating scans by 10°C/min. The polyesters were found to be stable. For PPAd the temperatures for initialization of decomposition and that of maximum decomposition rate were reported to be 359 and 392°C respectively. The respective temperatures for the copolymers increased with increasing propylene isophthalate content. 

Fig. 24.5 Temperature-dependent UV-visible absorption spectra of poly(3-dodecylthiophene) in the solid state (heating scan). (From Ref. 33.)...

FIGURE 3.17 DSC thermograms of the first heating scan of the VUV-irradiated for 3,6,10, 30, 60, and 100 min and unirradiated PLA membrane. (Reprinted from Desalination, 287, S. Sato et al., Effects of irradiation with vacuum ultraviolet xenon excimer lamp at 172 nm on water vapor transport through poly[lactic acid] membranes, 290-300. Copyright 2012, with permission from Elsevier B.V.)... 

Fig. 8. DSC thermograms of poly(tetrahydropyran-2,6-diyliminocarbonyl) prepared in DMSO at 19 °C fen 72 hr in 56% yield. Heating rate, 10 °C/min. A, original scanning B, rescanning after scanning up to 290 °cS8)...

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