Analysis of adhesion of radiation curable compositions to polyester substrate. [. gamma. rays or electrons]
Properties of bonds produced by radiation curing of adhesives on polyester film were studied. Investigation of bonding in polyester non-wovens had revealed that adhesion of binders to fibers was weak, which resulted in interfacial failures, judged from electron micrographs. If a binder droplet surrounds a cluster of fibers, tearing of binder took place but fibers still peeled out of droplets with interfacial separation. In order to understand the failure mechanism, a study was carried out on Mylar film bonded with adhesives cured by electron beam or gamma-rays from /sup 60/Co. Mixtures of isodecyl acrylate and methyl methacrylate were copolymerized between Mylar films to produce adhesives with a wide range of glass transition temperatures. Hexanediol diacrylate was added in various amounts to produce different degrees of cross-linking. Small amounts of fumed silica (Cab-O-Sil) were added to thicken the monomers used in the /sup 60/Co experiments. By varying rheological properties in this fashion, a maximum peel force of 3.5 lb/in. was obtained. This value is in line with peel strengths from polyester using commercial, prepolymerized adhesives with solubility parameters similar to those used here delta = 8.3 to 9.3). These results show that the primary reason for the poor adhesion of radiation curable adhesives to polyester is their high degree of cross-linking and that radiation curable adhesives are not basically different from other types, except in cases where their unique properties could be utilized with advantage.
- Research Organization:
- North Carolina State Univ., Raleigh
- OSTI ID:
- 5241204
- Journal Information:
- J. Radiat. Curing; (United States), Vol. 4:3
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
ACRYLIC ACID ESTERS
CHEMICAL RADIATION EFFECTS
ADHESIVES
METHYL METHACRYLATE
POLYESTERS
CHEMICAL BONDS
CROSS-LINKING
FILMS
CARBOXYLIC ACID ESTERS
CHEMICAL REACTIONS
CHEMISTRY
ESTERS
METHACRYLIC ACID ESTERS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
POLYMERIZATION
POLYMERS
RADIATION CHEMISTRY
RADIATION EFFECTS
400600* - Radiation Chemistry
360406 - Materials- Polymers & Plastics- Radiation Effects- (-1987)