The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
A series of polyimide-clay-siloxane hybrid films with siloxane content up to 50% were successfully prepared by the sol-gel reaction of diethoxydimethylsilane (DEDMS) in the presence of poly(amic acid). XRD indicated that the organically modified montmorillonite(OMMT) layers were exfoliated and dispersed into the poly(amide acid) and polyimide film. The films were yellow and transparent when the siloxane...
Nanocomposites from polyimide and clay were prepared aiming at finding a promising method for enhancing particularly the tensile modulus of polyimide films. Polyimide-clay hybrids were prepared by blending of poly(amide acid) and organically modified-montmorillonite (OMMT) as a type of layered clays. Poly(amide acid) was prepared from the reaction of 3,3',4,4'-biphenyltetracarboxylic dianhydride (BPDA)...
Polybenzoxazine-clay hybrid nanocomposites were prepared from a polybenzoxazine precursor (B-a) and organically modified-montmorillonite (OMMT) as a type of layered silicates. OMMTs were prepared by surface treatment of montmorillonite (MMT) by octyl, dodecyl or stearyl ammonium chloride. The curing behavior of B-a in the presence of dispersed OMMT was followed by IR and DSC. DSC showed that the onset...
Reactive polyimide containing hydroxyl functionalities was prepared from the reaction of 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride and 3,3'-diamino-4,4'-dihydroxybiphenyl. Commercial epoxy resin was cured in the presence of different ratios of the reactive polyimide, giving a series of polyimide modified epoxy films. The transparent films had excellent solvent resistance. The tensile...
Copolymers of styrene and chloromethylstyrene containing 2% ammonium salt groups have been grafted onto montmorillonite interlayers by cation exchange process. The remaining chloromethyl groups were modified to produce phosphonium salts. The catalytic activities of the phosphonium moieties supported on polystyrene-montmorillonite have been investigated in thiocyanate and nitrite nucleophilic reactions...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.