Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Pretreatment polymer precursor

Tin PS, Chung T-S, Hill AJ (2004) Advanced fabrication of carbon molecular sieve membranes by nonsolvent pretreatment of precursor polymers. Ind Eng Chem Res 43 (20) 6476-6483... [Pg.89]

Oxidation Several pretreatments have been used to condition CMS precursors before pyrolysis. The most common pretreatment is preoxidation. Preoxidation can form crosslinks in the polymer structure and therefore increase the thermal stability of the precursor. David and Ismail (2003) have shown that the thermal stability of polyacrylonitrile (PAN) hollow-fiber membranes is improved when the precursors were heated to 250°C in air or oxygen for 30 min. The results suggest that stabilization in an inert atmosphere can cyclize PAN, while stabilization in an oxidative environment both cyclizes and oxidizes the structure. [Pg.612]

See other pages where Pretreatment polymer precursor is mentioned: [Pg.612]    [Pg.165]    [Pg.317]    [Pg.132]    [Pg.294]    [Pg.52]    [Pg.333]    [Pg.19]    [Pg.107]    [Pg.613]   
See also in sourсe #XX -- [ Pg.612 , Pg.613 , Pg.614 , Pg.615 , Pg.616 , Pg.617 , Pg.618 , Pg.619 , Pg.620 , Pg.621 , Pg.622 , Pg.623 , Pg.624 , Pg.625 , Pg.626 , Pg.627 , Pg.628 , Pg.629 , Pg.630 ]



SEARCH



Polymer precursors

© 2024 chempedia.info