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Pathology behavior of different binary Polymer blends and blends
composites against bacteria |
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Background: Reduction the risk of pathogen diffusion and severe
diseases, need for antibacterial surface has been urgent.
Antimicrobial polymer cab be defined as polymers with
antimicrobial activity, or have the ability to prevent the
growth of microorganisms such as bacteria, fungi or protozoans.
Typically, this type of polymers are produced by inserting or
attaching an active antimicrobial agents onto the backbone of
polymer via an alkyl or acetyl linker, therefore; this material
can be candidate to be used in medical areas as tools to fight
infection, more over in the food industry to inhibit bacterial
contamination, and in water purification to inhibit
microorganisms growth in drinking water. Objective: In this
work, it has been employed two methods for improvement
antibacterial of poly methyl methacrylate (PMMA), high-density
polyethylene (HDPE) and ultra-high molecular weight polyethylene
(UHMWPE) using both blending technique and reinforcement with
1.5wt.% of Nano powders (zirconia and hydroxyapatite). Samples
tested against two types of bacteria positive gram
staphylococcus and negative gram pseudomonas to assay the
efficiency as antibacterial. Results:Results showed that
blending technique strongly discourages growth of bacteria
colonies; the same result was in polymer blends composites
reinforced with zirconia and hydroxyapatite, except in case of
PMMAUHMWPE blend at which the effect of antigrowth was negative.
Results of CFU of polymer blends composites showed improvement
of the antibacterial with the addition of 1.5 wt. % of zirconia
and Hydroxyapatite nanoparticles. Scanning electron microscope
of polymer blends shows two different systems, homogenous and
heterogeneous at which two distinct phases exist, a continuous
PMMA matrix and dispersed globules of the second polymer phase,
but with some discontinuous phase structure or so called “phase
inversion”. SEM of blends Nano composites showed that the
dispersion of ZrO2 and HAp nanoparticles was relatively good and
uniformly throughout the entire polymer blend at low ratio of
concentrations, but the opposite occurs at high weight
ratios(i.e.1.5wt%). Conclusion:The positive effect of blending
polymers on prevent the growth of colonies and the addition of
both reinforcements that indicate to good compatibility between
fillers and polymer blend matrix. |
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