the various properties for a wide range of materials especially for polymer
molecules
Fig 5 shows the solubility parameters of PVA and PAA with different repeat unit
numbers.The curves in Fig. 5 indicate when the number of repeat unit is more
than 30, the solubility parameter of PVA will tend to stability, while the
solubility parameter of PAA molecular chain reaches stable after the
number of repeat unit exceeding 20. In order to make the molecular
weights of PVA and PAA molecular chains equal to each other, a PVA
chain with 49 monomers and a PAA chain with 30 monomers were
built and used in this study