Dependence of glass transition temperature

FIGURE 11.28 Dependence of glass transition temperature and tan S on monomer concentration. (From Suriyachi, P., Kiatkamjomwong, S., and Prasassarkich, P., Rubber Chem. Technol., 77, 914, 2004.)... 

The glass transition temperatures determined with these polyesteramide resins appeared to be strongly dependent on the type of anhydride used and of their molecular weight. Figure 10 shows the dependence of glass transition temperature on molecular weight for hyperbranched polyesteramides based on hexahydrophthalic anhydride. In general, the Tg for HHPA- and THPA-based resins were about 45-90°C, PA based resins about 70-100°C, and SA and GA about 20-40°C. 

This leads to a dependence of glass transition temperature on composition... 

Figure 15. Dependence of glass transition temperature of copolymers on mol% concentration of cyclic carbosiloxane (A) fragments 1 -copolymers with m = 1 2 - with m = 2...

Figure 2. Dependence of glass transition temperature, T , on composition for samples cured with schedule A.

Figure 3. Dependence of glass transition temperature on composition of samples cured at ambient temperature and following subsequent heat-up. Key to cure schedule -----------------, A , B and B + heat-up to 180°C.

Figure 25. Dependence of glass transition temperature on chlorine content in low-temperature chlorination of PVC.

C.T. Moynihan, A.J. Eastel, J. Wilder and J. Tucker, Dependence of glass transition temperature on heating and cooling rate, J. Phys. Chem., 1974, 78, 2673-2677. 

Fig. 1 Dependence of glass transition temperature on thickness of PS thin film supported on Si substrate Symbols other than solid squares were cited from formerly reported results and solid squares were from [5]. Solid line is the empirical fitting function to the observed data. For further detail please refer to [5]...

FIGURE 17 The dependence of glass transition temperature T on Kuhn segment length T for PESF. 

FIGURE 49 The dependence of glass transition temperature T on formal fiagments contents c.. 1— ttie e q)erimental dat 2—calculation according to the Eqs. (14) of Ch ter 1 and (95H97). 

Table 16.3 Dependence of Glass Transition Temperature and Melting Point on Composition...

Figure 8.1 Dependence of glass-transition temperature (Tg) on the thickness of the epoxy polymer layer applied to a granite surface waterproofed with surfactant (1), glass (2), and granite (3)...

Figure 9.1 Dependence of glass transition temperature Tg on film thickness for ED-20—PEPA on basalt-2 with a layer of surfactant (1), basalt-2 (2), basalt-1 (3).

In Fig. 46 the dependences of glass transition temperature Tg, determined by the thermomechanical method, on formal contents cform are shown for the indicated copolymers. As one can see, the dependences Tg(cform) course is different for these copolymers. For APESF the values Tg are situated above additive glass transition temperature, for CP-OFD-lO/P-1 — lower and for diblock-copolymers CP-OFD-lO/OSF-10 the dependence Tg(cform) has sigmoid character. Such course of the dependences Tg(cform) for the indicated copolymers supposes different change Kh with copolymers composition. The value KM can be estimated according to tlie well-known Gordon-Talor-Wood equation [143] ... 

FIGURE 61 The dependence of glass transition temperature on macromolecular coil fractal dimension for polyarylates of series Ph (1) and D (2). The curve is theoretical calculation, the points are experimental data. 

In Fig. 62 the dependence of glass transition temperature on fractal dimension Dp calculated according to the Eq. (22), is adduced for the five considered copolymers PAASO. As it follows from the adduced plot, linear decay at increasing is observed, that perfectly justifies the proposed by Kargin idea about polymers properties encodion on molecular level [170], Let us remind, that the value Df characterizes stracture of macromolecular coil in diluted solution, i.e., as a matter of fact, an isolated macromolecule. A solvent variation results to change, that explains polymers properties change at their samples production from solutions in different solvents [171]. 

FIGURE 63 The dependence of glass transition temperature Tg on condensed state fractal dimension df for copolymers PAASO. The points — experimental data, the straight line — theoretical calculation. 

Applying Equation (16) results in the following pressure dependence of glass transition temperature. 

So far, how to make a feasible and unified interpretation to the structural dependence of glass transition temperatures above is still a big challenge. 

As mentioned above, it seems reasonable that p should not exceed unity if crystal field coordination parameters do not underestimate metal-ligand bonding in the amorphous phase. This restriction on p allows one to identify the minimum value of A(LFSE) for complexes with arbitrary geometry and coordination number. Based solely on experimental data and the proposed concentration dependence of glass transition temperature enhancement. 

Table 3.1 shows the chemical stmcture of the repeating units of the first series of the studied polyimides and some of their physical properties. Some of these polyimides contain methyl substituents on phenylene rings (2, 4 and 6) and other contain hexafluoroisopropylidene groups (5 and 6) in the main chain [35], Figure 3.6 presents the dependence of glass transition temperature on Kuhn segment. 

FIGURE 3.24 Dependence of glass transition temperature Tg) on characteristic ratio (C ) for the third series of polyimides. 

---