Table 1. Structural Parameters Derived from the DSC and SAXS Data for UHMWPE and HDPE Samples^a.

sample	heat of melting [J/g]	DSC weight crystallinity, Xc [%]	DSC mean crystal thickness lcb, [nm]	crystal thickness estimated from the melting <keep-together>peak—lc′c [nm]</keep-together>	lc + la[nm]d	<keep-together>lc′ + la</keep-together> [nm]d	long period from SAXS [nm]
HDPE 06	194.2	66.3	22.46	28.14	35.81	44.84	34.6
UHMWPE 5	153.9	52.5	18.27	22.4	37.6	46.1	40.6
UHMWPE 9	154.3	52.7	18.61	23.34	38.14	47.8	43.6

^aMean crystal thickness obtained from the crystal thickness distributions in Figure 4, amorphous layer thickness calculated from the crystallinity degree and the crystal thickness. Assuming PE crystal density 1.0 g/cm³⁵⁴ and density of the PE amorphous phase 0.855 g/cm³.⁵⁵ LP determined from the SAXS images in Figure 5.

^bCalculated from the lamellae thickness distribution obtained from the DSC melting curve using eqs 5 and 6.

^cCalculated from the maximum of the melting peak with eq 5.

^dl_a and l_a^′ were calculated from l_c or l_c, respectively, and X_c using eqs 7 and 8.