| Titre : |
The third way : Overcoming the deficiencies of free-radical and cationic photoinitiators with photobase generators |
| Type de document : |
texte imprimé |
| Auteurs : |
Nobuhiko Sakai, Auteur ; Kosuke Yanaba, Auteur ; Shigeaki Imazeki, Auteur |
| Année de publication : |
2018 |
| Article en page(s) : |
p. 48-54 |
| Langues : |
Anglais (eng) |
| Catégories : |
Acide polyamique
Acides carboxyliques
Epoxydes
Photoamorceurs (chimie)
Photoréticulation
Réaction thiol-ène
Réactions chimiques
Réticulants
Sol-gel, Procédé
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Photobase generators can generate bases in situ. They have huge potential as photocatalysts for polymer crosslinking and modification, and can be used for photocuring systems for epoxy compounds and for photoinduced imidisation polyamic acid in the coatings and microelectronic industries. PBGs are easy to activate in the case of compounds that have active protons, e.g. thiols and carboxylic acids. |
| Note de contenu : |
- TYPES OF PBG
- HOW TO SELECT A PGG : Reactivity of the resin to be used - Solubility - Irradiation conditions - Types of amine generated as base - Thermal stability - Stability (pot life) of compositions containing PBG - Outgassing - Trace-metal control
- PRACTICAL ANIONIC UV CURING WITH PBGS : Combination of dual UV curing, sol-gel process and thiol-ene reaction with PBG-A - Anionic UV curing of epoxy and multi-functional thiol with PBG-2 - Anionic UV curing of epoxy and multi-functional carboxylic acid with PBG-3 - Effective photosensitisers for borate-type PBG
- Fig. 1 : Comparison of cationic and anionic photoinitiators with crosslinking agent
- Fig. 2 : Generation of free-radical species from PBG-1
- Fig. 3 : Dual UV curing with sol-gel process and thiol-ene reaction (organic and inorganic hybrid)
- Fig. 4 : Anionic UV curing of epoxy and multi-functional thiol with PBG-2
- Fig. 5 : Anionic UV curing of epoxy and multi-functional carboxylic acid
- Fig. 6 : Stability of compositions in terms of pot life
- Fig. 7 : Percentage photodecomposition of PBG-3 with co-existence of sensitisers
- Table 1 : Structure and some properties of PBG-1
- Table 2 : Structure and some properties of PBG-2
- Table 3 : Structure and some properties of PBG-3 |
| En ligne : |
https://drive.google.com/file/d/1zFXNqQfuA6Q5h78n9ex61ulnZaeQw8vd/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30839 |
in EUROPEAN COATINGS JOURNAL (ECJ) > N° 7-8 (07-08/2018) . - p. 48-54
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