The demand for new antibacterial additives for the plastic
industry is spurring researchers to seek new approaches to
develop such material. A new additive should comprise two
important abilities: the ability to reduce or destroy bacterial
growth and the ability to merge into plastic bulk material.
The current study presents a new approach for the
development of a new antibacterial additive. This method
involves the grafting of polymeric side chains to chitosan, a
known antibacterial polymer, in an attempt to enhance its
compatibility with plastic bulk material. The synthesis of this
material involves conjugation of PEG chains to chitosan. In
addition the resulting PEGylated chitosan was verified and
characterized using ATR-FTIR, TGA and DSC. It demonstrated
good antibacterial properties compared to native chitosan. The
new additive could be incorporated in polyethylene, leading to
films with better transparency compared to films compounded
with native chitosan.The PEGylated chitosan film exhibit anti-
bacterial activity which was not detected in the chitosan based
film. The thermal and mechanical properties of the films were
evaluated using DSC and tensile analysis. The thermal behavior
of the film was governed by the bulk LDPE material due to the
small additive concentration, yet the footprint of the additive
was detectable. The addition of PEGylated chitosan decreased
the Young modulus, which was correlated to the PEG’s
compatibilizer-like effect. These results strengthen our initial
hypothesis which suggests that increased anti-bacterial activity
can be achieved by incorporating side chain enhancing the
competabilty with plastic materials.
Further study is needed in order to develop other additive
molecules that meet all the requirements for active packaging.
The demand for new antibacterial additives for the plasticindustry is spurring researchers to seek new approaches todevelop such material. A new additive should comprise twoimportant abilities: the ability to reduce or destroy bacterialgrowth and the ability to merge into plastic bulk material.The current study presents a new approach for thedevelopment of a new antibacterial additive. This methodinvolves the grafting of polymeric side chains to chitosan, aknown antibacterial polymer, in an attempt to enhance itscompatibility with plastic bulk material. The synthesis of thismaterial involves conjugation of PEG chains to chitosan. Inaddition the resulting PEGylated chitosan was verified andcharacterized using ATR-FTIR, TGA and DSC. It demonstratedgood antibacterial properties compared to native chitosan. Thenew additive could be incorporated in polyethylene, leading tofilms with better transparency compared to films compoundedwith native chitosan.The PEGylated chitosan film exhibit anti-bacterial activity which was not detected in the chitosan basedfilm. The thermal and mechanical properties of the films wereevaluated using DSC and tensile analysis. The thermal behaviorof the film was governed by the bulk LDPE material due to thesmall additive concentration, yet the footprint of the additivewas detectable. The addition of PEGylated chitosan decreasedthe Young modulus, which was correlated to the PEG’scompatibilizer-like effect. These results strengthen our initial
hypothesis which suggests that increased anti-bacterial activity
can be achieved by incorporating side chain enhancing the
competabilty with plastic materials.
Further study is needed in order to develop other additive
molecules that meet all the requirements for active packaging.
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