Synthesis and characterization of new UV absorbing microspheres of narrow size distribution by dispersion polymerization of 2-(2′-hydroxy-5′-methacryloxyethylphenyl)-2H-benzotriazole

Jenny Goldshtein, Shlomo Margel

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

New UV absorbing microspheres of sizes ranging between 0.2 ± 0.03 and 3.0 ± 0.2 μm were formed by dispersion polymerization of the monomer 2-(2′-hydroxy-5′-methacryloxyethylphenyl)-2H-benzotriazole (trade name: NORBLOC) in methyl ethyl ketone as a continuous phase. The effect of various polymerization parameters, such as monomer concentration, initiator type and concentration, stabilizer concentration and crosslinker monomer concentration, on the size and size distribution, and on the polymerization yield of the produced PNORBLOC microspheres has been elucidated. Polyethylene/PNORBLOC resins and films of 150 ± 25 μm thickness were prepared by melt blending of low density polyethylene with 2% (w/w) PNORBLOC microspheres of 0.25 ± 0.03 μm diameters, followed by a tubular blown process at 170-190 °C. The UV irradiation (200-390 nm) cut-off efficiency of these films has been demonstrated.

Original languageEnglish
Pages (from-to)3422-3430
Number of pages9
JournalPolymer
Volume50
Issue number15
DOIs
StatePublished - 17 Jul 2009

Bibliographical note

Funding Information:
These studies were partially supported by a Minerva Grant (Microscale & Nanoscale Particles and Films) and by The Israeli Ministry of Commerce & Industry (NFM Consortium on Nanoparticles for Industrial Applications). Thanks to Mrs. Hanna Schwartz from Kafrit Industries, Israel for her help in the preparation of the PE/PNORBLOC resins and films. Thanks also to Dr. Rachel Persky from Bar-Ilan University, Department of Chemistry, for her help in the MS analysis.

Funding

These studies were partially supported by a Minerva Grant (Microscale & Nanoscale Particles and Films) and by The Israeli Ministry of Commerce & Industry (NFM Consortium on Nanoparticles for Industrial Applications). Thanks to Mrs. Hanna Schwartz from Kafrit Industries, Israel for her help in the preparation of the PE/PNORBLOC resins and films. Thanks also to Dr. Rachel Persky from Bar-Ilan University, Department of Chemistry, for her help in the MS analysis.

FundersFunder number
Israeli Ministry of Commerce & Industry
Nemzeti Fejlesztési Minisztérium

    Keywords

    • Dispersion polymerization
    • UV absorbing films
    • UV absorbing microspheres

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