Strukturuntersuchungen an PF/cellulosepapier-verbunden mittels dynamisch-mechanischer analyse

This paper tries to connect the structure of tung oil and tricresyl phosphate modified phenolic paper-base laminates used for printed circuit boards in a large scale, with properties of these laminates by means of dynamic-mechanical analysis and dielectric measurements. The internal plasticization of tung oil is discussed. The modification of phenolic resin with tung oil causes in addition to flexibilisation, that a higher conversion of functional groups during the resit formation is attained by removal of steric hindrances, in this way the degree of cross-linkage is increased in comparison to the unmodified laminate. The measurements show that tricresyl phosphate is an external plasticizer which reduces the intermolecular interactions.