کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5187044 | 1381119 | 2005 | 10 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Microcellular foams from some high-performance composites Microcellular foams from some high-performance composites](/preview/png/5187044.png)
High-temperature composites were successfully prepared from aminated polysulfone, polyphenylsulfone, and a rod-like polymer polybenzimidazole (PBI). The single glass transition temperature Tg and the absence of evidence for phase separation in scanning electron microscopy suggested that these systems formed so-called 'molecular composites'. The enhanced miscibility between the polymer pairs was probably due to hydrogen bonding interactions. Compared with the matrix polymers themselves, these composites have improved values of Tg and thermal stability due to a synergistic effect upon incorporation of polybenzimidazole into the polymer matrices. Microcellular foams were successfully prepared from these composites. The foaming behavior and morphologies of the resulting composite foams were much more complicated than those of the pure polymers. In particular, they had unusual bimodal cell size distributions, and some open or partially open-cell structures.
Journal: Polymer - Volume 46, Issue 17, 8 August 2005, Pages 6623-6632