Big Chemical Encyclopedia

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

Articles Figures Tables About

Cellulose acetate synthesis procedure

The synthesis procedure (Scheme 31.1) was developed originally using as precursor [Ru(COD)(COD)] as precursor and dihydrogen as reducing agent in the presence of a polymer, namely, nitrocellulose (NC), cellulose acetate (CA), or poly(vinylpyrrolidone) (PVP) under mild conditions (3 bar H2, room temperature). The hydrogen treatment allows the reduction of the olefln ligands into cyclooctane, which is inert toward the metal surface. These NPs are stable and can be used for surface reactivity studies. With PVP, very small (1.1 nm) NPs wCTe obtained (Fig. 31.1) [16]. [Pg.422]

Introduction of these photocrosslinkable structures in macro-molecular chains can be performed by esterification of hydroxyla-ted polymers with cinnamoyl chloride. Cellulose Q).condensation products (4, ) and mainly poly(vinyl alcohol) have Been treated( by this method. Other chemical modifications have been studied as ester interchange of poly(vinyl acetate) 7) and Knoevenagel reaction on polyesters (8). Very few results on the synthesis of such photocrosslinkable polymers by polymerization have been reported. Therefore free radical polymerization of cinnamic acid vinyl derivatives did not lead to the expected polymers, but to insolubilization reactions. Howewer cationic procedure can be a good way in some cases since Kato et al. could polymerize by this way with high yields p-vinyl phenylcinnamate (9) and B-vinyloxyethyl cinnamate (10). [Pg.37]


See other pages where Cellulose acetate synthesis procedure is mentioned: [Pg.194]    [Pg.361]    [Pg.79]    [Pg.130]    [Pg.363]    [Pg.205]    [Pg.977]    [Pg.144]   
See also in sourсe #XX -- [ Pg.409 ]




SEARCH



Acetals procedures

Acetals, synthesis

Acetic synthesis

Cellulose acetate

Cellulose synthesis

Cellulosics cellulose acetate

Synthesis acetate

Synthesis procedures

© 2024 chempedia.info