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![[Figure 4]](ju5085fig4mag.jpg)
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Figure 4
(a) Temperature dependence of the specific volumes of the P4VP homopolymer, PEO homopolymer and PEO-b-P4VP at 1 bar obtained by the Tail model. The number-average molecular weights and polydispersity indices of the PEO and P4VP homopolymers are 5000 (g mol−1)/1.12 and 7000 (g mol−1)/1.04, respectively, which are very similar to those of the PEO and P4VP blocks in the copolymer. The blue line corresponds to the calculated specific volume of the miscible mixture of PEO and P4VP assuming ideal mixing. (b) Electron densities of PEO and P4VP as a function of temperature calculated from the specific volume data in (a). The electron density is given by ρe = ρ(nme/Mm), where ρ, nme and Mm are the mass density, the number of moles of electrons per mole of repeating unit and the molecular weight of the repeating unit, respectively. For PEO, nme,EO = 24 mol e mol−1 and Mm,EO = 44 g mol−1. For P4VP, nme,4VP = 56 mol e mol−1 and Mm,4VP = 105 g mol−1. |
![[Figure 4]](ju5085fig4.jpg)
 | JOURNAL OF APPLIED CRYSTALLOGRAPHY |
ISSN: 1600-5767
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