9CHEN Y L, HELM C A, ISRAELACHVILI J N. Molecular mechanisms associated with adhesion and contact angle hysteresis of" monolayer sur- faces [ J ]. The Journal of Physical Chemistn,. 1991,95 ( 26 ) : 10736-10747.
10MORRA M, OCCHIELLO E, GARBASSI F. Knowledge about polymer surfaces from contact angle measurements[ J ]. Advances in Colloid and Interface Science, 1990,32 ( 1 ) :79-116.