solvents as a function of the solvent's solubility parameter. (a) Based on the graph, estimate the solubility parameter of polyphenylene oxide. (b) The solubility parameter for xylene is 18 MPa. Will polyphenylene absorb xylene? (c) Find the strain to fracture of polyphenylene oxide in contact with xylene. Hint: Be sure to convert your units. Critical strain in air Ecrit 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 This graph shows the strain to fracture for the polymer polyphenylene oxide in different T 0 L 2 4 Polyphenylene oxide 6 8 10 12 14 16 18 20 Solubility parameter (cal/cm)1/2