Prediction of glass transition temperatures: Binary blends and copolymers

Structural and Thermal Analysis of Carbon Nano-Particles/Polypyrrole/Poly (Ethylene – Co – Vinyl Acetate) Composites

“…Due to the importance of glass transition phenomenon, many approaches have already been investigated, based on thermodynamic or kinetic features of T g , to consider a theoretical base for models presently used to estimate T g of binary polymer blends from knowledge of properties of their homopolymers [3,11]. One of these models is the Fox equation for a binary system 1 and 2 [4,12]:…”

“…The gradualism from glassy state to rubbery state means that the phenomenon of (T g ) covers broad temperature windows but the experimentalists prefer to report only a single value of (T g ) to facilitate comparisons between different binary polymer blend concentrations [3]. Determining (T g ) values of the polymer blend, enables knowing its state of being immiscible or compatible or fully miscible (single value of T g ) [4]. Characterizing the structure and understanding the possible physical properties that occur at the interface of materials can be investigated by (XRD).…”

Thermally Responsive Amphiphilic Conetworks and Gels Based on Poly(N-isopropylacrylamide) and Polyisobutylene

“…These T g values are between 107 and 128 ˚C, and considerably lower than that of the PNiPAAm homopolymer (134 ˚C 32 ). In miscible polymer blends 27,28 , only one Tg, depending on composition, between the T g of the components exists (see e. g. Refs. 27,28 and references therein).…”

Synthesis and characterization of copolymers of methylmethacrylate and 2-hydroxyethyl methacrylate for the aqueous solubilization of Paclitaxel

“…Experimental behavior can be compared to theoretical approaches proposed by Fox (equation 1) (Brostow et al, 2008) and Gordon-Taylor (equation 2a) (Gordon, 1952): where w MMA and w HEMA are the weight fractions of functional units present in the copolymer chain, t g,MMA and t g,HEMA are the glass transition temperatures of In Figure 4, differential scanning calorimetric curves are reported, while Figure 5 shows experimental and theoretical behavior for all tested polymers.…”