UV Curing ANIONIC & CATIONIC
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The document discusses the differences between anionic and cationic polymerization. Anionic polymerization involves the polymerization of vinyl monomers with strongly electronegative groups. Cationic photoinitiators are also called photo-acid generators and initiate cationic polymerization through the formation of a carbocation intermediate. Both anionic and cationic polymerization are used to produce polymers with controlled properties for various applications such as adhesives, coatings, elastomers, and synthetic rubber.
UV Curing ANIONIC & CATIONIC
- 1. UV CURING : ANIONIC VS CATIONIC PHOTO-POLYMERIZATION CATIONIC PHOTO-INITIATORS ARE ALSO CALLED PHOTO-ACID GENERATORS ANIONIC POLYMERIZATION INVOLVES THE POLYMERIZATION OF VINYL MONOMERS POSSESSING STRONG ELECTRONEGATIVE GROUPS. Sugeng Endarsiwi_2023
- 2. •BRIEFLY INFO ABOUT ULTRAVIOLET CURING •ULTRAVIOLET (UV) CURING COATING, INITIALLY PIONEERED BY GERMANY IN THE LATE 1960S, REPRESENTS A NOVEL AND ENVIRONMENTALLY FRIENDLY COATING. THIS COATING BOASTS SEVERAL ADVANTAGES, INCLUDING HIGH EFFICIENCY, ENERGY CONSERVATION, LACK OF POLLUTION, RAPID FILM FORMATION, AND OUTSTANDING COATING PERFORMANCE, LEADING TO ITS SWIFT DEVELOPMENT. •WHAT ARE THE DIFFERENCES BETWEEN ANIONIC AND CATIONIC POLYMERIZATION? •ANIONIC POLYMERIZATION AND CATIONIC POLYMERIZATION ARE TWO TYPES OF CHAIN GROWTH POLYMERIZATION REACTIONS THAT ARE USED FOR SYNTHESIZING DIFFERENT TYPES OF POLYMERS. •ALTHOUGH BOTH REACTIONS HAVE THE SAME MECHANISM, THERE ARE SEVERAL DIFFERENCES BETWEEN THE TWO.
- 3. •DEFINITION •ANIONIC POLYMERIZATION REFERS TO A TYPE OF POLYMERIZATION PROCESS THAT IS DEPENDENT ON THE REACTIVITY OF ANIONS TO INITIATE AND PROPAGATE THE POLYMERIZATION REACTION. •CATIONIC POLYMERIZATION REFERS TO A TYPE OF CHAIN GROWTH POLYMERIZATION MECHANISM IN WHICH THE FORMATION OF A CARBOCATION INTERMEDIATE INITIATES THE POLYMERIZATION REACTION.
- 4. •POLYMERIZATION IS A CHEMICAL PROCESS IN WHICH SMALL MOLECULES CALLED MONOMERS REACT WITH EACH OTHER TO FORM LONG CHAINS OR NETWORKS KNOWN AS POLYMERS. •THIS REACTION OCCURS THROUGH THE BONDING OF MONOMERS, WHICH CREATE REPEATING UNITS THAT MAKE UP THE POLYMER STRUCTURE. •CATIONIC AND ANIONIC POLYMERIZATION ARE TWO TYPES OF POLYMERIZATION.
- 5. •CATIONIC POLYMERIZATION HAS A WIDE RANGE OF USES. THIS PROCESS CAN BE USED TO PRODUCE POLYMERS WITH CONTROLLED MOLECULAR WEIGHT, NARROW POLYDISPERSITY, AND UNIQUE ARCHITECTURES. THESE CHARACTERISTICS HELP IN THE DEVELOPMENT OF ADVANCED MATERIALS SUCH AS ADHESIVES, COATINGS, AND PHOTORESISTS. •CATIONIC POLYMERIZATION CAN BE USED IN THE PRODUCTION OF ELASTOMERS, WHICH ARE MATERIALS THAT EXHIBIT HIGH ELASTICITY AND RESILIENCE. •THESE CAN BE USED IN APPLICATIONS SUCH AS GASKETS, SEALS, AND TIRES
- 6. THERE ARE MANY APPLICATIONS OF ANIONIC POLYMERIZATION. IT ALSO HELPS TO PRODUCE BLOCK COPOLYMERS. ANOTHER APPLICATION OF ANIONIC POLYMERIZATION IS THE PRODUCTION OF SYNTHETIC RUBBER. PROPERTIES OF RUBBER, SUCH AS ELASTOMERIC PROPERTIES, MAKE THEM USEFUL IN THE MAKING OF APPLICATIONS SUCH AS TIRES, SEALS, AND GASKETS. ANIONIC POLYMERIZATION ENABLES THE CREATION OF ELASTOMERS WITH EXCELLENT MECHANICAL PROPERTIES SUCH AS HIGH ELASTICITY, LOW GLASS TRANSITION TEMPERATURES, AND RESISTANCE TO HEAT AND CHEMICALS. ANOTHER USE OF ANIONIC POLYMERIZATION IS IN THE DEVELOPMENT OF FUNCTIONAL POLYMERS. IT ALSO HELPS IN THE FABRICATION OF VARIOUS NANOMATERIALS.
- 7. •A POLYMER COATING IS A THIN LAYERED COATING OR PAINT MADE WITH POLYMERS THAT PROVIDE SUPERIOR ADHERENCE AND PROTECTION FROM CORROSION. A POLYMER IS A MOLECULE MADE BY JOINING TOGETHER MANY SMALL MOLECULES CALLED MONOMERS THAT ARE MADE UP OF A LARGE NUMBER OF SIMILAR UNITS.
- 8. Source: 1. https://longchangchemical.com/comparison-of-uv-free-radical-and-cationic-curing/ 2. https://polymerinnovationblog.com/uv-curing-part-five-cationic-photopolymerization 3. https://pediaa.com/what-is-the-difference-between-cationic-and-anionic-polymerization/ 4. https://www.aatbio.com/resources/faq-frequently-asked-questions/what-are-the-differences- between-anionic-and-cationic-polymerization 5. https://www.gellnerindustrial.com/blog/cationic-vs-anionic-polymers/