Glass Transition Temperature of Crosslinked Polymer
نویسندگان
چکیده
منابع مشابه
Glass transition of miscible binary polymer-polymer thin films.
The average glass transition temperatures, Tg, of thin homopolymer films exhibit a thickness dependence, Tg(h), associated with a confinement effect and with polymer-segment-interface interactions. The Tg's of completely miscible thin film blends of tetramethyl bisphenol-A polycarbonate (TMPC) and deuterated polystyrene (dPS), supported by SiO(x)/Si, decrease with decreasing h for PS weight fra...
متن کاملGlass Transition Temperatures In Binary Polymer Blends
Knowledge of the glass transition temperatures (Tgs) as function of composition reflects miscibility (or lack of it) and is decisive for virtually all properties of polymer-based materials. In this article, we analyze single blend-average and effective Tgs of miscible polymer blends in full concentration ranges. Shortcomings of the extant equations are discussed to support the need for an alter...
متن کاملMolecular weight dependence of reductions in the glass transition temperature of thin, freely standing polymer films.
We have used transmission ellipsometry to perform a comprehensive study of the glass transition temperature T(g) of freely standing polystyrene films. Six molecular weights M(w), ranging from 575 x 10(3) to 9100 x 10(3), were used in the study. For each M(w) value, large reductions in T(g) (as much as 80 degrees C below the bulk value) were observed as the film thickness h was decreased. We hav...
متن کاملEffect of Free Surfaces on the Glass Transition Temperature of Thin Polymer Films.
We report the first measurements of the glass transition temperature Tg for thin freely standing polystyrene (PS) films. We have used Brillouin light scattering to measure Tg for freely standing films of different thicknesses. We find that Tg decreases linearly with film thickness h for h # 700 Å, with a reduction of 70 K for a film with h 290 Å. These measurements characterize unambiguously ...
متن کاملRetention of mechanical performance of polymer matrix composites above the glass transition temperature by vascular cooling
An actively cooled vascular polymer matrix composite containing 3.0% channel volume fraction retains greater than 90% flexural stiffness when exposed continuously to 325 °C environmental temperature. Non-cooled controls suffered complete structural failure through thermal degradation under the same conditions. Glass–epoxy composites (T g = 152 °C) manufactured by vacuum assisted resin transfer ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Kobunshi Kagaku
سال: 1961
ISSN: 1884-8079,0023-2556
DOI: 10.1295/koron1944.18.183