1 / 31

Events - PowerPoint PPT Presentation

  • Updated On :

Events. Structure. Revenue. Portfolio. Capabiliy. Philosophy. Support. Competence. Nanoparticles as UV absorbers. Nano Functional Materials. (NFM) project. יום עיון : יישומי ננו טכנולוגיה בתעשיית הפלסטיקה והגומי . שנקר, בי"ס גבוה להנדסה ועיצוב . ינואר 2007. Support program for:

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
Download Presentation

PowerPoint Slideshow about 'Events' - fred

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
Slide1 l.jpg









Nanoparticles as UV absorbers.

Nano Functional Materials.

(NFM) project.

יום עיון: יישומי ננו טכנולוגיה בתעשיית הפלסטיקה והגומי .

שנקר, בי"ס גבוה להנדסה ועיצוב.

ינואר 2007.

Magnet l.jpg

Support program for:

Generic Technological R&D

Transfer of technology: Academia to industry.

Operational framework is a consortium

of industries and research institutes.

66% government grant.

MAGNETמחקר גנרי טכנולוגי

Slide3 l.jpg

Consortium frame work:

12 Industries.

Researchers from 3 academic institutions.

Three leading projects:

Manufacturing and stabilization of nano particles in liquid phase.

Compounding nano particles into polymers matrix.

De-agglomeration of nano particles.


Why nanoparticles additives l.jpg

Functional properties with almost no outward migration from the polymer.


Positive interaction with polymer to obtain specific advantages. e.g. nanoclays –improves mechanical properties and transparent.

Why nanoparticles additives ?

Kafrit s activities l.jpg

Challenges: the polymer.

Agglomeration interferes with functional dispersion.

Surface treatments, dispersing agents…

Adjusting process parameters.

Evaluation of the dispersion quality: TEM, SEM and…

Areas of activity:

UV absorbers/blockers: nanosized ZnO, organic UVA nano-particles.

Flame retardants.

Kafrit’s activities:

Uv absorbed blocked films for pest control l.jpg

Without the polymer.

UV blocking

With UV blocking

UV absorbed/blocked films for pest control.

Advantages of UV absorbers in Greenhouse Films:

  • Distorts harmful insects activity.

  • Controls viral plant diseases vectored by insects*.

    In addition:

  • Protects the polymer from photo oxidative


  • Prevents petal blackening.

*This is the reason why, in commercial applications, UV blocked AgriFilms is also called “AntiVirus”

Slide7 l.jpg

Advantages of UV absorbers in Packaging Films: the polymer.

Benefits:UV light filtering can prevent undesirable changes of the color, odor, flavor and nutrients.

Effective blocking in thin films – no migration/”blooming”.

no UV

Myoglobin (red) Metmayoglobin (brown)


UV blocking/Packaging.

UV, O2

Deterioration of uv blockage effect l.jpg
Deterioration of UV blockage effect. the polymer.

UV absorbers are lost as the results of photodecomposition and migration.

Uv blocking zno l.jpg
UV blocking – ZnO. the polymer.

Preliminary particles size 50-60 nm.

In practice: aggregates of 1-2 mm.

Zno homogenous dispersions of l.jpg
ZnO. the polymer.Homogenous dispersions of

Influence of dispersing aid/surfactant type on ZnO dispersion.

  • Compounding with dispersing aids of different functionality.

  • Haze (forward light scattering) as the dispersion’s quality parameter.

Dispersion aids and zno l.jpg
Dispersion aids and ZnO. the polymer.



By Prof. Y. Cohen (Technion)

Long lasting uv blocking effect l.jpg
Long lasting UV blocking effect. the polymer.

ZnO - UV blocking effect maintains for longer period of time compares to the organic UVA.

Long lasting uv blockage pesticides influence l.jpg

Org UVA_1 the polymer.

ZnO based_1

ZnO based_2

Org UVA_2

Long lasting UV blockage/Pesticides influence.

Faster deterioration of UV blockage in the formulations based on nanosized ZnO compares to the organic UVA as the result of sulfur burning.

There is strong relation between UV blockage deterioration and amount of sulfur applied.

Zno nano effect on organic uva migration l.jpg
ZnO nano - effect on organic UVA migration. the polymer.

Without ZnO.

With ZnO.

  • Nanosized ZnO slows down migration rate of organic UVA.

  • Potential application for thin packaging films.

Intermediate conclusions l.jpg

Dispersion is feasible. the polymer.

Chemistry: Improved dispersion with the proper surfactant.

High transparency and low light scattering.

Further steps: influence of processing conditions on the nonoparticles dispersion.

Long lasting UV blockage:

Long term effect without agrochemicals.

Further steps: influence of particles surface treatment onagrochemical’s resistance.

Migration control by nanoparticles.

Intermediate conclusions.

Novel uva organic particles synthesis of uv absorbing nano particles 1 prof s margel l.jpg

Emulsion polymerization of UVA monomers ( the polymer.acrylate substituted BZT).

Novel UVA organic particles:Synthesis of UV absorbing nano particles (1)Prof. S. Margel

Emulsion polymerization l.jpg

BZT the polymer.


Emulsion polymerization.

Tem picture of polymerized bzt l.jpg
TEM picture of polymerized BZT. the polymer.

Average particles size 280  20 nm.

Synthesis of uv absorbing nano particles 2 l.jpg
Synthesis of UV absorbing nano particles the polymer.(2)

  • But- synthesis products aggregate.

  • Dispersion is possible:

    • surfactants compatible with polyolefins.

    • drying on the porous resin.

Polymerized bzt pe film l.jpg

X 1000 the polymer.

Polymerized BZT / PE film.

Dispersion of polymerized BZT particles in LDPE.

Polymerized bzt uv absorption efficiency l.jpg

BZT_0.75% the polymer.

Polymerized BZT/ UV absorption efficiency.

Higher concentration of polymerized nanoparticles is needed to achieve UV blockage.

“Waste” of UVA moieties due to polymerization.

Further steps l.jpg

Reduction of the particles size. the polymer.

Grafting of BZT brushes on the surface modified silica nano particles:

Further steps:

Nano sio 2 particles l.jpg
Nano SiO the polymer.2 particles.

Nano sized SiO2 .

Surface Modified SiO2

Organic uva particles summary l.jpg

Novel nanosized UVA particles were synthesized. the polymer.

Homogeneous dispersion in PO matrix. (adjustment of proper surfactants and drying conditions of synthesis products).

Not sufficient efficiency of UV blockage.

Further steps:improvement UV absorption efficiency by

Reduction of particle size.

Grafting of UVA monomer on nanosized silica.

Organic UVA particles/Summary.

Slide26 l.jpg

End the polymer.

Uv blocking particles and organic compounds l.jpg
UV blocking–particles and organic compounds. the polymer.

Normalized blocking efficiency

The challenge of nano particles compounding l.jpg

Dispersion without agglomeration the polymer.

Use dispersion aids.

Evaluation of the dispersion quality: TEM, SEM and…

Understanding the effects of the extrusion parameters on the dispersion quality.

Personnel and environmental safety.

The challenge of nano particles compounding

Effect of zno loading on af l.jpg

High loading – no AF Low loading - AF the polymer.

Effect of ZnO loading on AF