Polymerization
What is Polymerization?
Polymerization is a chemical process in which small molecules (monomers) are joined together to form long polymer chains or three-dimensional networks. This process forms the basis of curing for many adhesives and determines their final mechanical and chemical properties.
Properties of Polymerization
- Build-up of high-molecular structures from monomers
- Irreversible crosslinking of the adhesive
- Development of mechanical strength and cohesion
- Exothermic reaction with heat generation
- Volume change through shrinkage
- Dependence on initiator and activation energy
Types of Polymerization
- Radical polymerization: Initiation by UV light or heat
- Ionic polymerization: Cationic or anionic initiation
- Coordination polymerization: Metal-catalyzed chain growth
- Step-growth polymerization: Condensation and addition reactions
Activation Mechanisms
- UV curing: Photoinitiator starts radical chain reaction
- Activis Technology: Light-activated polymerization
- Thermal activation: Heat starts decomposition reaction
- Moisture curing: Water initiates polymerization
Influencing Factors
- Temperature: Higher temperatures accelerate polymerization
- Open time: Processable time window before polymerization begins
- Pot life: Processing time of reactive systems
- Oxygen inhibition: Inhibition of radical polymerization
Application Relevance
- Optical Adhesives: Controlled polymerization for refractive index
- Conductive Adhesives: Polymer matrix with conductive particles
- Structural Bonding: Complete polymerization for maximum strength
- High Temperature Adhesives: Highly crosslinked polymer systems
Quality Assurance
- DSC analysis: Measurement of degree of polymerization
- FTIR spectroscopy: Conversion determination of monomers
- Hardness measurement: Indirect determination of crosslinking degree
- Mechanical testing: Strength development over time
DELO Adhesive Solutions
- Optimized polymerization systems for various requirements
- 1-Component Adhesives with controlled polymerization properties
- Technical consulting for process optimization
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