Glass transition temperature polymer

Allen, G., D. Sims and G. J. Wilson Intermolecular forces and chain-flexibilities in polymers. III. Internal pressures of polymers below their glass transition temperatures. Polymer 2, 375—382 (1961). 

Verhoeven, J. Schaeffer, R. Bouwstra, J.A. Junginger, H.E. The physico-chemical characterization of poly(2-hydroxyethyl methacrylate-co-methacrylic acid) 2. Effect of water, PEG 400 and PEG 6000 on the glass transition temperature. Polymer 1989, 30, 1946-1950. 

Fig. 3. Glass transition temperatures shown by copolymers of different phase separation levels. High phase separation and larger domain sizes lead to two glass transition temperatures (polymer + silicone, 1st colunm), while statistical copolymers indicate only one Tg for the specific crqiolymer.

Uchidoi, M., Adachi, K., and Ishida, Y., Volume relaxation in amorphous polymers around glass-transition temperature, Polym. J., 10, 161-167 (1978). 

There are multiple techniques under development to stabilize the bulk heterojunction and consequently improve performance stability the use of ternary blends with compatibilizers, such as, block copolymers, amorphous fullerene derivatives, high glass transition temperature polymers, thermos-cleavable polymers, specifically designed donor-acceptor systems with enhanced interactions, functionalized side chains on the polymer and cross-linkable materials (Mulherin et al., 2011). The cross-linking materials... 

This high glass transition temperature polymer exhibits large electrooptic coefficients, -14-35 pm fV. The second harmonic measurements indicate long-term stability of the dipole orientation (> 800h at 100 °C). 

F. Y. Stepanov, G. V., Efffect of Iron Particles on Dielectric Properties of Polydimethylsiloxane near Crystallization and Glass Transition Temperatures. Polym. Set, Ser. B 2006,48,1898-1902. 

Easy film formation when a low Tg (glass transition temperature) polymer is employed as core material. 

A Nicolet 7000 FTIR instrument was used for the infrared studies with 120 scans accumulated for all samples. The materials used for the FTIR study were prepared as follows samples of polymers of low glass transition temperatures which were soluble in THF were prepared by the deposition of a polymer solution onto an NaCl window. For moderately high glass transition temperature polymers soluble in THF, samples were prepared by solution casting onto a glass plate. Thin films of polymer samples insoluble in THF were compression molded at 150 to 200 C (depending on the sample). An FTIR calibration curve was obtained from ethyl acrylate copolymers which had previously been neutralized completely with perchloric acid. This curve was used to determine semiquanti-tively the percent proton transfer in the blends. 

Ciesielski Michael, Schafer Alexander, and Dbring Manfred. Novel efficient DOPO-based flame-retardants for PWB relevant epoxy resins with high glass transition temperatures. Polym. Adv. Technol. 19 no. 6 (2008) 507-515. 

The properties of polymeric materials are similar to those of rubber, at temperatures above the glass transition temperature. Polymers in this state are called rubbery polymers. Usually, gas molecules permeate through the rubbery polymer very quickly because the binding force between molecular segments of the polymer is not strong, and segments can move relatively easily to open a... 

Lange, J., ToU, S., Manson, J. A. E., Hult, A. (1997). Residual stress build-up in thermoset films cured below their ultimate glass transition temperature. Polymer, 58(4), 809-815. 

F. E. Karasz, T.S. Ellis Interaction of epoxy resins with water the depression of glass transition temperature. Polymer, 25 (1984), p. 664-669... 

Amorphous polymers deform viscously above their glass transition temperature. Polymers generally exhibit non-Newtonian behavior (viscosity is not constant) and their time-dependent behavior can be modeled mechanically by a combination of springs and dashpots. 

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