Abstract
Polystyrene (PS) UV absorber microspheres of narrow size distribution have been prepared in two ways: (1) Entrapment of the UV absorber molecule, 2-(5-chloro-2H-benzotriazole-2-yl)-6-(1, 1-dimethylethyl)-4-methyl-phenol) [TINUVIN® 326] within uniform PS template microspheres by swelling these template particles with methylene chloride emulsion droplets containing the TINUVIN, followed by evaporation of the methylene chloride from the swollen PS microspheres. (2) A similar swelling process, substituting the methylene chloride emulsion droplets containing the TINUVIN for methylene chloride emulsion droplets containing the monomers, divinyl benzene (DVB) and styrene (S) and the initiator, benzoyl peroxide and TINUVIN. The monomers within the swollen microspheres were then polymerized by elevating the temperature of the swollen particles to 73 °C. The influence of the weight ratio [TINUVIN]/[PS] on the entrapped percentage of TINUVIN was elucidated. Polyethylene/TINUVIN, PE/(PS/TINUVIN), and PE/(PS/P(S-DVB-TINUVIN)) resins and films were prepared by melt blending of low-density PE with TINUVIN and with the UV absorber microspheres, followed by a tubular blown process. The UV absorption of these composite films was demonstrated. The leakage kinetics of the TINUVIN from these composite films was according to the following order: PE/(PS/P(S-DVB-TINUVIN)) < PE/(PS/TINUVIN) < PE/TINUVIN. [Figure not available: see fulltext.]
Original language | English |
---|---|
Pages (from-to) | 1863-1874 |
Number of pages | 12 |
Journal | Colloid and Polymer Science |
Volume | 289 |
Issue number | 17-18 |
DOIs | |
State | Published - Nov 2011 |
Bibliographical note
Funding Information:These studies were partially supported by a Minerva Grant (Microscale and Nanoscale Particles and Films) and by The Israeli Ministry of Commerce and 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/TINUVIN resins and films.
Funding
These studies were partially supported by a Minerva Grant (Microscale and Nanoscale Particles and Films) and by The Israeli Ministry of Commerce and 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/TINUVIN resins and films.
Funders | Funder number |
---|---|
Israeli Ministry of Commerce and Industry | |
Nemzeti Fejlesztési Minisztérium |
Keywords
- Benzotriazole microspheres
- Encapsulation
- UV absorbing films
- UV absorbing microspheres