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 novel heterocyclic and plank-shape diamine monomer, 2,6-(4,4′-diaminodiphenyl) benzo[1,2-d:5,4-d'] bisoxazole (PBOA), was successfully synthesized from readily available compounds of 4,6-diaminoresorcinol dihydrochloride (DAR) and p-aminobenzoic acid (PABA). A series of poly(benzobisoxazole-co-imide) (PBOI) fibers based on 3,3′,4,4′-biphenyltetracarboxylic anhydride (BPDA), 4,4′-diaminodiphenyl...
Structural evolution induced by cyclization reaction and heat-drawing of polyimide (PI) fibers containing the 2-(4-aminophenyl)-5-aminobenzimidazole moiety was studied by means of synchrotron radiation wide-angle X-ray diffraction (WAXD) and small-angle X-ray scattering (SAXS). WAXD results indicate that the drawing process induces an increase in the crystallinity and crystal orientation of PI fibers,...
Graphene possesses unprecedented physical and chemical properties and has been thought to be ideal filler for reinforcing fibers' mechanical properties. However, graphene is difficultly dispersed in polymer which severely restrict to prepare high-strength and high-modulus composites. In this work, we report an effective method to fabricate a kind of organ-soluble polyimide (PI)/graphene composite...
A simple water-soluble pyrene-functionalized cationic polyelectrolyte poly(4- vinylpyridine) quaternary ammonium (P4VP-Py-Bu) was designed and synthesized from poly(4-vinylpyridine) by two-step quaternization with 1-(bromomethyl)pyrene and 1-bromobutane. The polymer could be bound with a single-stranded DNA (ssDNA) by electrostatic interactions and hydrophobic interactions to form a fluorescent complex...
A novel pyrene-labeled polyelectrolyte (Py-PDMAEMA + ) has been prepared by atom transfer radical polymerization (ATRP) for detection of DNA hybridization. The electrostatic and hydrophobic interactions between Py-PDMAEMA + and ssDNA (hairpin or linear DNA) kept them forming a complex probe which could be used as a turn-off fluorescent sensor. The fluorescence intensity of the probe...
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.