Abstract
The physical properties of ethylene-vinylalcohol-acrylic acid terpolymer (EVA-AA) cross-linked with diamine were investigated in relation to thermal properties measured by DSC and dynamic mechanical properties.
The following results were obtained:
1) EVA-AA was cross-linked by a two-step process viz., the immersion into a diamine solution and heat treatment. The degree of cross-linking and the physical properties of cross-linked EVA-AA were affected by the degree of swelling at immersion and the conditions of heat treatment i.e., temperature and time.
2) As the degree of cross-linking increased, the glass transition temperature and flow-region shifted to a higher temperature level and obscured away.
3) Tensile properties of the cross-linked films had a tendency to deteriorate under profuse swelling in diamine solution causing a decrease of crystallinity and disarrangement of the molecular orientation.
4) The moisture regain of the cross-linked specimens was 8_??_13%.
The degree of shrinkage in boiling water and the degree of heat-shrinkage at 150°C of effectively cross-linked films were both less than 10%.
