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Overcoming the Effects of Oxygen on Cured and Uncured Uv Formulations
Molecular oxygen can be thought of as a diradical. Its singletstate is unstable and quickly converts to the triplet which ismolecular oxygen's electronic ground state. This diradical lacksthe energy to initaiate polymerizations, and, therefore, isconsidered stable. While notbeing able to initiatepolymerizations, it does readily react with already e
Adhesion Optimisation Through Oligomer/Monomer-Selection
Two years ago. we set up a study[1] in an attempt. to correlate polymerizationshrinkage with adhesion on non-porous substrates. The work was carried out onABS and steel. Establishing a correlation between either shrinkage or surface tension and adhesion seemed to be a very difficult thing, based on the limited datawe had at the time. Let us remind
Measurement Of Crosslinking Degree For Electron Beam Irradiated Block Copolymers
IntroductionRecently a lot of block copolymers are applied as useful composite systems or adhesives because of their excellent mechanical properties such as modulus, elongation andbreaking energy. However, since these copolymers are essentially thermoplastic, onceheated up, the mechanical characteristics mentioned above will be easily lost. In orde
Improving The Adhesion Onto Difficult Substrates
One of the major problems facing surface coating is theadhesion between the coating and the substrate surface. Failureat this interface renders the coating useless.It has become common practice to call many types of plasticsdifficult substrates, as getting coatings to adhere well to themproves rather difficult. This problem is not confined toradiat
The Synthesis And Performance Of Some New Oligomeric Photoinitiators
INTRODUCTIONInterest has grown in the design and use of polymeric photoinitjators with one of the main motivating influences beingthe desire to reduce the number of  migratable low molecularweight species present in the cured film [1]. Such species arebelieved to be responsible for the phenomenon of blooming [2] ie. loss of glass of the film u
Oligomer Interactions In Radiation Cured Systems
IntroductionA long held belief in the coatings industry is that the filmproperties of two resins blended together usually fall shortof those of the tow components taken individually. On theother hand, formulators recognize that use of a single resinis rarely if ever, possible to achieve the requiredperformance requirements. Typically, in a solvent
Investigations On The Adhesion Of Eb Cured Coatings On Metal Substrates
INTRODUCTIONMetals have a particular position in the field of electron beam curing ofcoatings. At a first metals would be expected to be very suitable substrates for EB example, many industrial metal productspossess flat surfaces, which is an-obvious advantage considering electronbeam curing. However, in practice the number of applications on steel
Aromatic Acid: Methacrylates In Radiation Cure
IntroductionHighly functional aromatic acid methacrylate 'oligomers contain8 - l0 methacrylate and 8 - l0 carboxylic acid groups. Themethacrylate's high functionality and reactivity suits radiationcure. Carboxylic acid groups provide unique solvent and acidresistance, while promoting caustic solubility. The aromaticnature of the oligomer improves a