The process of adhesion at the contact zone of two thick films of amorphous high-molecular-weight polymers with glassy bulk has been investigated by means of a lap-shear joint method. The kinetics and temperature dependence of strength s at both symmetric and asymmetric polymer-polymer interfaces have been found to follow the repetition mechanism of chain diffusion and an Arrhenius-like behavior, respectively. A new method to measure the surface glass transition temperature (Tg
bulk) have been compared. Over the two last decades, much attention has been paid to an increased molecular
mobility at polymer surfaces and interfaces in comparison with that in the interior bulk regions (Akabori et al., 2003; Boiko et al., 1997, 2004; Fischer, 2002; Fu et al., 2005; Hyun et al., 2001; Kajiyama et al., 1995; Kawaguchi et al.,1998, 2003; Mansfield et al., 1991; Mayes, 1994; Prucker et al., 1998; Satomi et al., 1999; Zhang et al., 2000). Of particular interest is the question regarding the difference between the surface glass transition temperature Tg
2005; Hyun et al., 2001; Kajiyama et al., 1995; Kawaguchi et al., 1998; Mayes, 1994; Prucker et al., 1998; Satomi et al., 1999). However, there is still the discussion in the literature as whether the reduction in Tg
to the presence of free surface or not (Boiko et al., 1997, 2004; Kawana et al., 2001; Sharp et al., 2003).