The main chemical treatments used so far are: alkaline treatment or mercerization, silane treatment, acetylation, benzoylation
, acrylation or acrylonitrile grafting, as well as maleated coupling agents ,
Several strategies exist to diminish the hydrophilic nature, among these are the mercerizing, acetylation, benzoylation
and coupling surface treatments of the fiber through silane coupling agents (SCA).
After completion of benzoylation
, the reaction mixture was worked-up as usual which afforded a residue.
of the secondary alcohol in 9 was followed by selective removal of the isopropylidene group to give primary alcohol 10.
The free polyamine content of the acid-soluble supernatant fraction was determined, after benzoylation
, by high performance liquid chromatography.
Various chemical treatments have been reported to improve the physicochemical performance of natural fibers such as mercerization, silane treatment, acetylation, benzoylation
, plasma treatment, etc [22-25].
N-Terminal acetylation or benzoylation
lowered reactivity, suggesting either steric effects or preference for a free amine over an amide.
0 Treatments Mercerization Benzoylation Silane HRH a Parts per hundred rubber (phr).
After benzoylation, as a result of esterification of the hydroxy] group, the intensities of the peak corresponding to the -OH stretching vibrations in the region 3400-3450 [cm.
of the BF makes the surface of the fiber more rough and provides better mechanical interlocking with the polymer matrix.
treatment, benzoyl chloride is most often used in fiber pretreatment and inclusion of benzoyl ([C.
of sisal fiber was found to enhance the tensile properties of resulting composites.