Coefficient of friction (COF) measurements and AFM of LLDPE films containing erucamide and behenamide indicated that COF reduction is not necessarily dependent on additive coverage of the film surface. A film containing 1010 ppm erucamide yielded a kinetic COF of 0.2 without complete surface coverage, whereas a 1080 ppm behenamide film exhibited a saturated surface and higher COF. AFM showed distinct differences in crystal formation between the surface-segregated additives, with erucamide exhibiting a plate-like structure.
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Ramírez et al. (2001) studied this question.
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